diff --git a/tests/array_spread/__snapshots__/jsfmt.spec.js.snap b/tests/array_spread/__snapshots__/jsfmt.spec.js.snap
index 3ec2ed4d2..4fede5c75 100644
--- a/tests/array_spread/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/array_spread/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`multiple.js 1`] = `
+exports[`multiple.js-flow 1`] = `
 "[...a, ...b,];
 [...a, ...b];
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -9,7 +9,7 @@ exports[`multiple.js 1`] = `
 "
 `;
 
-exports[`multiple.js 2`] = `
+exports[`multiple.js-typescript 1`] = `
 "[...a, ...b,];
 [...a, ...b];
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/arrays/__snapshots__/jsfmt.spec.js.snap b/tests/arrays/__snapshots__/jsfmt.spec.js.snap
index 5c9618de2..b67af45e3 100644
--- a/tests/arrays/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/arrays/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`last.js 1`] = `
+exports[`last.js-flow 1`] = `
 "[,];
 [,,];
 [,,1,];
@@ -13,7 +13,7 @@ exports[`last.js 1`] = `
 "
 `;
 
-exports[`last.js 2`] = `
+exports[`last.js-typescript 1`] = `
 "[,];
 [,,];
 [,,1,];
@@ -26,7 +26,7 @@ exports[`last.js 2`] = `
 "
 `;
 
-exports[`preserve_empty_lines.js 1`] = `
+exports[`preserve_empty_lines.js-flow 1`] = `
 "a = [
 
   1,
@@ -44,7 +44,7 @@ a = [1, 2, 3, 4];
 "
 `;
 
-exports[`preserve_empty_lines.js 2`] = `
+exports[`preserve_empty_lines.js-typescript 1`] = `
 "a = [
 
   1,
diff --git a/tests/arrows/__snapshots__/jsfmt.spec.js.snap b/tests/arrows/__snapshots__/jsfmt.spec.js.snap
index 985596674..88e63cb88 100644
--- a/tests/arrows/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/arrows/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`arrow_function_expression.js 1`] = `
+exports[`arrow_function_expression.js-babylon 1`] = `
 "(a => {}).length
 typeof (() => {});
 export default (() => {})();
@@ -66,14 +66,14 @@ a = (b?) => c;
 "
 `;
 
-exports[`block_like.js 1`] = `
+exports[`block_like.js-babylon 1`] = `
 "a = () => ({} = this);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 a = () => ({} = this);
 "
 `;
 
-exports[`call.js 1`] = `
+exports[`call.js-babylon 1`] = `
 "Seq(typeDef.interface.groups).forEach(group =>
   Seq(group.members).forEach((member, memberName) =>
     markdownDoc(
@@ -231,7 +231,7 @@ jest.mock(
 "
 `;
 
-exports[`long-call-no-args.js 1`] = `
+exports[`long-call-no-args.js-babylon 1`] = `
 "veryLongCall(VERY_VERY_VERY_VERY_VERY_VERY_VERY_VERY_VERY_VERY_LONG_CONSTANT, () => {})
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 veryLongCall(
@@ -241,7 +241,7 @@ veryLongCall(
 "
 `;
 
-exports[`long-contents.js 1`] = `
+exports[`long-contents.js-babylon 1`] = `
 "const foo = () => {
   expect(arg1, arg2, arg3).toEqual({message: 'test', messageType: 'SMS', status: 'Unknown', created: '11/01/2017 13:36'});
 };
@@ -257,7 +257,7 @@ const foo = () => {
 "
 `;
 
-exports[`short_body.js 1`] = `
+exports[`short_body.js-babylon 1`] = `
 "const initializeSnapshotState = (
   testFile: Path,
   update: boolean,
diff --git a/tests/assignment/__snapshots__/jsfmt.spec.js.snap b/tests/assignment/__snapshots__/jsfmt.spec.js.snap
index 69f93fe46..8fbef84c4 100644
--- a/tests/assignment/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/assignment/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`binaryish.js 1`] = `
+exports[`binaryish.js-flow 1`] = `
 "const computedDescriptionLines = (showConfirm &&
   descriptionLinesConfirming) ||
   (focused && !loading && descriptionLinesFocused) ||
diff --git a/tests/assignment_comments/__snapshots__/jsfmt.spec.js.snap b/tests/assignment_comments/__snapshots__/jsfmt.spec.js.snap
index 46a2055e0..c73708571 100644
--- a/tests/assignment_comments/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/assignment_comments/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`assignment_comments.js 1`] = `
+exports[`assignment_comments.js-flow 1`] = `
 "fnString =
   // Comment
   'some' + 'long' + 'string';
@@ -120,7 +120,7 @@ let f = (
 "
 `;
 
-exports[`assignment_comments.js 2`] = `
+exports[`assignment_comments.js-typescript 1`] = `
 "fnString =
   // Comment
   'some' + 'long' + 'string';
diff --git a/tests/assignment_expression/__snapshots__/jsfmt.spec.js.snap b/tests/assignment_expression/__snapshots__/jsfmt.spec.js.snap
index cc53cafe3..2e9ea3945 100644
--- a/tests/assignment_expression/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/assignment_expression/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`assignment_expression.js 1`] = `
+exports[`assignment_expression.js-flow 1`] = `
 "this.size = this._origin = this._capacity = 0;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 this.size = this._origin = this._capacity = 0;
diff --git a/tests/async/__snapshots__/jsfmt.spec.js.snap b/tests/async/__snapshots__/jsfmt.spec.js.snap
index 01749e485..eebbd2cdb 100644
--- a/tests/async/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/async/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`await_parse.js 1`] = `
+exports[`await_parse.js-flow 1`] = `
 "async function f() { (await f()).length }
 async function g() {
   invariant(
@@ -29,7 +29,7 @@ async function f() {
 "
 `;
 
-exports[`await_parse.js 2`] = `
+exports[`await_parse.js-typescript 1`] = `
 "async function f() { (await f()).length }
 async function g() {
   invariant(
@@ -58,7 +58,7 @@ async function f() {
 "
 `;
 
-exports[`conditional-expression.js 1`] = `
+exports[`conditional-expression.js-flow 1`] = `
 "async function f() {
   const result = typeof fn === 'function' ? await fn() : null;
 }
@@ -79,7 +79,7 @@ async function f() {
 "
 `;
 
-exports[`conditional-expression.js 2`] = `
+exports[`conditional-expression.js-typescript 1`] = `
 "async function f() {
   const result = typeof fn === 'function' ? await fn() : null;
 }
diff --git a/tests/binary-expressions/__snapshots__/jsfmt.spec.js.snap b/tests/binary-expressions/__snapshots__/jsfmt.spec.js.snap
index 09286db6f..f4e068b1a 100644
--- a/tests/binary-expressions/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/binary-expressions/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`arrow.js 1`] = `
+exports[`arrow.js-flow 1`] = `
 "function f() {
   const appEntitys = getAppEntitys(loadObject).filter(
     entity => entity && entity.isInstallAvailable() && !entity.isQueue() && entity.isDisabled()
@@ -19,7 +19,7 @@ function f() {
 "
 `;
 
-exports[`comment.js 1`] = `
+exports[`comment.js-flow 1`] = `
 "a = (
   // Commment 1
   (Math.random() * (yRange * (1 - minVerticalFraction)))
@@ -34,7 +34,7 @@ a =
 "
 `;
 
-exports[`exp.js 1`] = `
+exports[`exp.js-flow 1`] = `
 "a ** b ** c;
 (a ** b) ** c;
 a.b ** c;
@@ -55,7 +55,7 @@ a ** (b * c);
 "
 `;
 
-exports[`inline-object-array.js 1`] = `
+exports[`inline-object-array.js-flow 1`] = `
 "prevState = prevState || {
   catalogs: [],
   loadState: LOADED,
@@ -88,7 +88,7 @@ this.steps = steps || [
 "
 `;
 
-exports[`short-right.js 1`] = `
+exports[`short-right.js-flow 1`] = `
 "this._cumulativeHeights &&
  Math.abs(
    this._cachedItemHeight(this._firstVisibleIndex + i) -
@@ -128,7 +128,7 @@ defaultContent.filter(defaultLocale => {
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "// It should always break the highest precedence operators first, and
 // break them all at the same time.
 
diff --git a/tests/bracketSpacing/__snapshots__/jsfmt.spec.js.snap b/tests/bracketSpacing/__snapshots__/jsfmt.spec.js.snap
index a5546b251..36928c6c2 100644
--- a/tests/bracketSpacing/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/bracketSpacing/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`array.js 1`] = `
+exports[`array.js-flow 1`] = `
 "const arr1 = [1,2,3,4];
 const arr2 = [1, 2, 3, 4];
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -9,7 +9,7 @@ const arr2 = [1, 2, 3, 4];
 "
 `;
 
-exports[`array.js 2`] = `
+exports[`array.js-flow 2`] = `
 "const arr1 = [1,2,3,4];
 const arr2 = [1, 2, 3, 4];
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -18,7 +18,7 @@ const arr2 = [1, 2, 3, 4];
 "
 `;
 
-exports[`array.js 3`] = `
+exports[`array.js-typescript 1`] = `
 "const arr1 = [1,2,3,4];
 const arr2 = [1, 2, 3, 4];
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -27,7 +27,7 @@ const arr2 = [1, 2, 3, 4];
 "
 `;
 
-exports[`array.js 4`] = `
+exports[`array.js-typescript 2`] = `
 "const arr1 = [1,2,3,4];
 const arr2 = [1, 2, 3, 4];
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -36,7 +36,7 @@ const arr2 = [1, 2, 3, 4];
 "
 `;
 
-exports[`object.js 1`] = `
+exports[`object.js-flow 1`] = `
 "const obj1 = {a:1, b:2, c:3}
 const obj2 = { a:1, b:2, c:3 };
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -45,7 +45,7 @@ const obj2 = { a: 1, b: 2, c: 3 };
 "
 `;
 
-exports[`object.js 2`] = `
+exports[`object.js-flow 2`] = `
 "const obj1 = {a:1, b:2, c:3}
 const obj2 = { a:1, b:2, c:3 };
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -54,7 +54,7 @@ const obj2 = {a: 1, b: 2, c: 3};
 "
 `;
 
-exports[`object.js 3`] = `
+exports[`object.js-typescript 1`] = `
 "const obj1 = {a:1, b:2, c:3}
 const obj2 = { a:1, b:2, c:3 };
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -63,7 +63,7 @@ const obj2 = { a: 1, b: 2, c: 3 };
 "
 `;
 
-exports[`object.js 4`] = `
+exports[`object.js-typescript 2`] = `
 "const obj1 = {a:1, b:2, c:3}
 const obj2 = { a:1, b:2, c:3 };
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/break-calls/__snapshots__/jsfmt.spec.js.snap b/tests/break-calls/__snapshots__/jsfmt.spec.js.snap
index 1782e5aa5..d8aa00059 100644
--- a/tests/break-calls/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/break-calls/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`break.js 1`] = `
+exports[`break.js-flow 1`] = `
 "h(f(g(() => {
   a
 })))
@@ -80,7 +80,7 @@ expect(
 "
 `;
 
-exports[`break.js 2`] = `
+exports[`break.js-typescript 1`] = `
 "h(f(g(() => {
   a
 })))
@@ -160,7 +160,7 @@ expect(
 "
 `;
 
-exports[`parent.js 1`] = `
+exports[`parent.js-flow 1`] = `
 "runtimeAgent.getProperties(
   objectId,
   false, // ownProperties
@@ -183,7 +183,7 @@ runtimeAgent.getProperties(
 "
 `;
 
-exports[`parent.js 2`] = `
+exports[`parent.js-typescript 1`] = `
 "runtimeAgent.getProperties(
   objectId,
   false, // ownProperties
diff --git a/tests/class_comment/__snapshots__/jsfmt.spec.js.snap b/tests/class_comment/__snapshots__/jsfmt.spec.js.snap
index 1ba9b5e19..ab7a076df 100644
--- a/tests/class_comment/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/class_comment/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`comments.js 1`] = `
+exports[`comments.js-flow 1`] = `
 "class A // comment 1
   // comment 2
   extends B {}
@@ -57,7 +57,7 @@ class A extends /* a */ B {}
 "
 `;
 
-exports[`comments.js 2`] = `
+exports[`comments.js-typescript 1`] = `
 "class A // comment 1
   // comment 2
   extends B {}
diff --git a/tests/class_extends/__snapshots__/jsfmt.spec.js.snap b/tests/class_extends/__snapshots__/jsfmt.spec.js.snap
index 5713ceea5..f25e9e67b 100644
--- a/tests/class_extends/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/class_extends/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`extends.js 1`] = `
+exports[`extends.js-flow 1`] = `
 "// \\"ArrowFunctionExpression\\"
 class a extends (() => {}) {}
 
@@ -119,7 +119,7 @@ x = class extends (++b) {};
 "
 `;
 
-exports[`extends.js 2`] = `
+exports[`extends.js-typescript 1`] = `
 "// \\"ArrowFunctionExpression\\"
 class a extends (() => {}) {}
 
diff --git a/tests/classes/__snapshots__/jsfmt.spec.js.snap b/tests/classes/__snapshots__/jsfmt.spec.js.snap
index f51a0b20a..b44b72f26 100644
--- a/tests/classes/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/classes/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`binary.js 1`] = `
+exports[`binary.js-flow 1`] = `
 "(class {}) + 1;
 (class a {}) + 1;
 (class extends b {}) + 1;
@@ -13,7 +13,7 @@ exports[`binary.js 1`] = `
 "
 `;
 
-exports[`break.js 1`] = `
+exports[`break.js-flow 1`] = `
 "class MyContractSelectionWidget extends React.Component<void,  MyContractSelectionWidgetPropsType, void> implements SomethingLarge {
   method() {}
 }
@@ -26,14 +26,14 @@ class MyContractSelectionWidget
 "
 `;
 
-exports[`call.js 1`] = `
+exports[`call.js-flow 1`] = `
 "(class {})(class {});
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 (class {}(class {}));
 "
 `;
 
-exports[`empty.js 1`] = `
+exports[`empty.js-flow 1`] = `
 "class A {
   // comment
 }
@@ -64,7 +64,7 @@ class A {
 "
 `;
 
-exports[`member.js 1`] = `
+exports[`member.js-flow 1`] = `
 "(class {})[1];
 (class {}).a;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -73,7 +73,7 @@ exports[`member.js 1`] = `
 "
 `;
 
-exports[`ternary.js 1`] = `
+exports[`ternary.js-flow 1`] = `
 "if (1) (class {}) ? 1 : 2;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 if (1) (class {} ? 1 : 2);
diff --git a/tests/comments/__snapshots__/jsfmt.spec.js.snap b/tests/comments/__snapshots__/jsfmt.spec.js.snap
index 675a0790f..cc356ebd2 100644
--- a/tests/comments/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/comments/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`assignment-pattern.js 1`] = `
+exports[`assignment-pattern.js-babylon 1`] = `
 "const { a /* comment */ = 1 } = b;
 
 const { c = 1 /* comment */ } = d;
@@ -18,7 +18,7 @@ let {
 "
 `;
 
-exports[`assignment-pattern.js 2`] = `
+exports[`assignment-pattern.js-flow 1`] = `
 "const { a /* comment */ = 1 } = b;
 
 const { c = 1 /* comment */ } = d;
@@ -36,7 +36,7 @@ let {
 "
 `;
 
-exports[`blank.js 1`] = `
+exports[`blank.js-babylon 1`] = `
 "// This file only
 // has comments. This comment
 // should still exist
@@ -83,7 +83,7 @@ exports[`blank.js 1`] = `
 "
 `;
 
-exports[`blank.js 2`] = `
+exports[`blank.js-flow 1`] = `
 "// This file only
 // has comments. This comment
 // should still exist
@@ -130,7 +130,7 @@ exports[`blank.js 2`] = `
 "
 `;
 
-exports[`call_comment.js 1`] = `
+exports[`call_comment.js-babylon 1`] = `
 "render( // Warm any cache
   <ChildUpdates renderAnchor={true} anchorClassOn={true} />,
   container
@@ -155,7 +155,7 @@ React.render(
 "
 `;
 
-exports[`call_comment.js 2`] = `
+exports[`call_comment.js-flow 1`] = `
 "render( // Warm any cache
   <ChildUpdates renderAnchor={true} anchorClassOn={true} />,
   container
@@ -180,7 +180,7 @@ React.render(
 "
 `;
 
-exports[`dangling.js 1`] = `
+exports[`dangling.js-babylon 1`] = `
 "var x = {/* dangling */};
 var x = {
   // dangling
@@ -211,7 +211,7 @@ export /* dangling */{};
 "
 `;
 
-exports[`dangling.js 2`] = `
+exports[`dangling.js-flow 1`] = `
 "var x = {/* dangling */};
 var x = {
   // dangling
@@ -242,7 +242,7 @@ export /* dangling */{};
 "
 `;
 
-exports[`dangling_array.js 1`] = `
+exports[`dangling_array.js-babylon 1`] = `
 "expect(() => {}).toTriggerReadyStateChanges([
   // Nothing.
 ]);
@@ -259,7 +259,7 @@ expect(() => {}).toTriggerReadyStateChanges(
 "
 `;
 
-exports[`dangling_array.js 2`] = `
+exports[`dangling_array.js-flow 1`] = `
 "expect(() => {}).toTriggerReadyStateChanges([
   // Nothing.
 ]);
@@ -276,7 +276,7 @@ expect(() => {}).toTriggerReadyStateChanges(
 "
 `;
 
-exports[`dangling_for.js 1`] = `
+exports[`dangling_for.js-babylon 1`] = `
 "for // comment
 (;;);
 
@@ -290,7 +290,7 @@ for (;;);
 "
 `;
 
-exports[`dangling_for.js 2`] = `
+exports[`dangling_for.js-flow 1`] = `
 "for // comment
 (;;);
 
@@ -304,7 +304,7 @@ for (;;);
 "
 `;
 
-exports[`export.js 1`] = `
+exports[`export.js-babylon 1`] = `
 "export //comment
 {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -313,7 +313,7 @@ export {};
 "
 `;
 
-exports[`export.js 2`] = `
+exports[`export.js-flow 1`] = `
 "export //comment
 {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -322,7 +322,7 @@ export {};
 "
 `;
 
-exports[`first-line.js 1`] = `
+exports[`first-line.js-babylon 1`] = `
 "a // comment
 b
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -331,7 +331,7 @@ b;
 "
 `;
 
-exports[`first-line.js 2`] = `
+exports[`first-line.js-flow 1`] = `
 "a // comment
 b
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -340,7 +340,7 @@ b;
 "
 `;
 
-exports[`flow_union.js 1`] = `
+exports[`flow_union.js-babylon 1`] = `
 "type UploadState<E, EM, D>
   // The upload hasnt begun yet
   = {type: \\"Not_begun\\"}
@@ -383,7 +383,7 @@ type UploadState<E, EM, D> =
 "
 `;
 
-exports[`flow_union.js 2`] = `
+exports[`flow_union.js-flow 1`] = `
 "type UploadState<E, EM, D>
   // The upload hasnt begun yet
   = {type: \\"Not_begun\\"}
@@ -426,7 +426,7 @@ type UploadState<E, EM, D> =
 "
 `;
 
-exports[`function-declaration.js 1`] = `
+exports[`function-declaration.js-babylon 1`] = `
 "function a(/* comment */) {} // comment
 function b() {} // comment
 function c(/* comment */ argA, argB, argC) {} // comment
@@ -437,7 +437,7 @@ function c(/* comment */ argA, argB, argC) {} // comment
 "
 `;
 
-exports[`function-declaration.js 2`] = `
+exports[`function-declaration.js-flow 1`] = `
 "function a(/* comment */) {} // comment
 function b() {} // comment
 function c(/* comment */ argA, argB, argC) {} // comment
@@ -448,7 +448,7 @@ function c(/* comment */ argA, argB, argC) {} // comment
 "
 `;
 
-exports[`if.js 1`] = `
+exports[`if.js-babylon 1`] = `
 "if (1)
 // comment
 {
@@ -492,7 +492,7 @@ else if (4) {
 "
 `;
 
-exports[`if.js 2`] = `
+exports[`if.js-flow 1`] = `
 "if (1)
 // comment
 {
@@ -536,7 +536,7 @@ else if (4) {
 "
 `;
 
-exports[`issues.js 1`] = `
+exports[`issues.js-babylon 1`] = `
 "// Does not need to break as it fits in 80 columns
 this.call(a, /* comment */ b);
 
@@ -762,7 +762,7 @@ foo(
 "
 `;
 
-exports[`issues.js 2`] = `
+exports[`issues.js-flow 1`] = `
 "// Does not need to break as it fits in 80 columns
 this.call(a, /* comment */ b);
 
@@ -988,7 +988,7 @@ foo(
 "
 `;
 
-exports[`jsx.js 1`] = `
+exports[`jsx.js-babylon 1`] = `
 "<div>
   {
     /* comment */
@@ -1126,7 +1126,7 @@ exports[`jsx.js 1`] = `
 "
 `;
 
-exports[`jsx.js 2`] = `
+exports[`jsx.js-flow 1`] = `
 "<div>
   {
     /* comment */
@@ -1264,7 +1264,7 @@ exports[`jsx.js 2`] = `
 "
 `;
 
-exports[`last-arg.js 1`] = `
+exports[`last-arg.js-babylon 1`] = `
 "type f = (
   currentRequest: {a: number},
   // TODO this is a very very very very long comment that makes it go > 80 columns
@@ -1321,7 +1321,7 @@ class X {
 "
 `;
 
-exports[`last-arg.js 2`] = `
+exports[`last-arg.js-flow 1`] = `
 "type f = (
   currentRequest: {a: number},
   // TODO this is a very very very very long comment that makes it go > 80 columns
@@ -1378,7 +1378,7 @@ class X {
 "
 `;
 
-exports[`preserve-new-line-last.js 1`] = `
+exports[`preserve-new-line-last.js-babylon 1`] = `
 "function f() {
   a
   /* eslint-disable */
@@ -1425,7 +1425,7 @@ function name() {
 "
 `;
 
-exports[`preserve-new-line-last.js 2`] = `
+exports[`preserve-new-line-last.js-flow 1`] = `
 "function f() {
   a
   /* eslint-disable */
@@ -1472,7 +1472,7 @@ function name() {
 "
 `;
 
-exports[`return-statement.js 1`] = `
+exports[`return-statement.js-babylon 1`] = `
 "function jsx() {
   return (
     // Comment
@@ -1712,7 +1712,7 @@ function inlineComment() {
 "
 `;
 
-exports[`return-statement.js 2`] = `
+exports[`return-statement.js-flow 1`] = `
 "function jsx() {
   return (
     // Comment
@@ -1952,7 +1952,7 @@ function inlineComment() {
 "
 `;
 
-exports[`switch.js 1`] = `
+exports[`switch.js-babylon 1`] = `
 "switch (node && node.type) {
   case \\"Property\\":
   case \\"MethodDefinition\\":
@@ -1995,7 +1995,7 @@ switch (foo) {
 "
 `;
 
-exports[`switch.js 2`] = `
+exports[`switch.js-flow 1`] = `
 "switch (node && node.type) {
   case \\"Property\\":
   case \\"MethodDefinition\\":
@@ -2038,7 +2038,7 @@ switch (foo) {
 "
 `;
 
-exports[`template-literal.js 1`] = `
+exports[`template-literal.js-babylon 1`] = `
 "\`
 \${a // comment
 }
@@ -2067,7 +2067,7 @@ d};
 "
 `;
 
-exports[`template-literal.js 2`] = `
+exports[`template-literal.js-flow 1`] = `
 "\`
 \${a // comment
 }
@@ -2096,7 +2096,7 @@ d};
 "
 `;
 
-exports[`try.js 1`] = `
+exports[`try.js-babylon 1`] = `
 "// comment 1
 try {
   // comment 2
@@ -2124,7 +2124,7 @@ try {
 "
 `;
 
-exports[`try.js 2`] = `
+exports[`try.js-flow 1`] = `
 "// comment 1
 try {
   // comment 2
diff --git a/tests/computed_props/__snapshots__/jsfmt.spec.js.snap b/tests/computed_props/__snapshots__/jsfmt.spec.js.snap
index ee18c93da..8da03e8cf 100644
--- a/tests/computed_props/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/computed_props/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`classes.js 1`] = `
+exports[`classes.js-flow 1`] = `
 "class c {
   [\\"i\\"]() {}
 }
@@ -11,7 +11,7 @@ class c {
 "
 `;
 
-exports[`classes.js 2`] = `
+exports[`classes.js-typescript 1`] = `
 "class c {
   [\\"i\\"]() {}
 }
diff --git a/tests/conditional/__snapshots__/jsfmt.spec.js.snap b/tests/conditional/__snapshots__/jsfmt.spec.js.snap
index 4bebfd114..444cb946e 100644
--- a/tests/conditional/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/conditional/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`comments.js 1`] = `
+exports[`comments.js-flow 1`] = `
 "var inspect = 4 === util.inspect.length
   ? // node <= 0.8.x
     (function(v, colors) {
@@ -79,7 +79,7 @@ const { configureStore } = process.env.NODE_ENV === \\"production\\"
 "
 `;
 
-exports[`comments.js 2`] = `
+exports[`comments.js-typescript 1`] = `
 "var inspect = 4 === util.inspect.length
   ? // node <= 0.8.x
     (function(v, colors) {
@@ -158,7 +158,7 @@ const { configureStore } = process.env.NODE_ENV === \\"production\\"
 "
 `;
 
-exports[`new-expression.js 1`] = `
+exports[`new-expression.js-flow 1`] = `
 "const testConsole = new TestConsole(
   config.useStderr ? process.stderr : process.stdout
 );
@@ -169,7 +169,7 @@ const testConsole = new TestConsole(
 "
 `;
 
-exports[`new-expression.js 2`] = `
+exports[`new-expression.js-typescript 1`] = `
 "const testConsole = new TestConsole(
   config.useStderr ? process.stderr : process.stdout
 );
diff --git a/tests/decorators/__snapshots__/jsfmt.spec.js.snap b/tests/decorators/__snapshots__/jsfmt.spec.js.snap
index 861197341..ff2919863 100644
--- a/tests/decorators/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/decorators/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`mobx.js 1`] = `
+exports[`mobx.js-babylon 1`] = `
 "import {observable} from \\"mobx\\";
 
 @observer class OrderLine {
@@ -41,7 +41,7 @@ import { observable } from \\"mobx\\";
 "
 `;
 
-exports[`multiple.js 1`] = `
+exports[`multiple.js-babylon 1`] = `
 "const dog = {
   @readonly
   @nonenumerable
@@ -58,7 +58,7 @@ const dog = {
 "
 `;
 
-exports[`redux.js 1`] = `
+exports[`redux.js-babylon 1`] = `
 "@connect(mapStateToProps, mapDispatchToProps)
 export class MyApp extends React.Component {}
 
diff --git a/tests/directives/__snapshots__/jsfmt.spec.js.snap b/tests/directives/__snapshots__/jsfmt.spec.js.snap
index 3a93b3aa9..947224a34 100644
--- a/tests/directives/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/directives/__snapshots__/jsfmt.spec.js.snap
@@ -1,45 +1,45 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`last-line-0.js 1`] = `
+exports[`last-line-0.js-babylon 1`] = `
 "'use strict';~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 \\"use strict\\";
 "
 `;
 
-exports[`last-line-0.js 2`] = `
+exports[`last-line-0.js-flow 1`] = `
 "'use strict';~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 \\"use strict\\";
 "
 `;
 
-exports[`last-line-0.js 3`] = `
+exports[`last-line-0.js-typescript 1`] = `
 "'use strict';~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 \\"use strict\\";
 "
 `;
 
-exports[`last-line-1.js 1`] = `
+exports[`last-line-1.js-babylon 1`] = `
 "'use strict';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 \\"use strict\\";
 "
 `;
 
-exports[`last-line-1.js 2`] = `
+exports[`last-line-1.js-flow 1`] = `
 "'use strict';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 \\"use strict\\";
 "
 `;
 
-exports[`last-line-1.js 3`] = `
+exports[`last-line-1.js-typescript 1`] = `
 "'use strict';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 \\"use strict\\";
 "
 `;
 
-exports[`last-line-2.js 1`] = `
+exports[`last-line-2.js-babylon 1`] = `
 "'use strict';
 
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -47,7 +47,7 @@ exports[`last-line-2.js 1`] = `
 "
 `;
 
-exports[`last-line-2.js 2`] = `
+exports[`last-line-2.js-flow 1`] = `
 "'use strict';
 
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -55,7 +55,7 @@ exports[`last-line-2.js 2`] = `
 "
 `;
 
-exports[`last-line-2.js 3`] = `
+exports[`last-line-2.js-typescript 1`] = `
 "'use strict';
 
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -63,7 +63,7 @@ exports[`last-line-2.js 3`] = `
 "
 `;
 
-exports[`newline.js 1`] = `
+exports[`newline.js-babylon 1`] = `
 "/* @flow */
 
 \\"use strict\\";
@@ -82,7 +82,7 @@ a();
 "
 `;
 
-exports[`newline.js 2`] = `
+exports[`newline.js-flow 1`] = `
 "/* @flow */
 
 \\"use strict\\";
@@ -101,7 +101,7 @@ a();
 "
 `;
 
-exports[`newline.js 3`] = `
+exports[`newline.js-typescript 1`] = `
 "/* @flow */
 
 \\"use strict\\";
@@ -120,7 +120,7 @@ a();
 "
 `;
 
-exports[`no-newline.js 1`] = `
+exports[`no-newline.js-babylon 1`] = `
 "\\"use strict\\";
 a
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -129,7 +129,7 @@ a;
 "
 `;
 
-exports[`no-newline.js 2`] = `
+exports[`no-newline.js-flow 1`] = `
 "\\"use strict\\";
 a
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -138,7 +138,7 @@ a;
 "
 `;
 
-exports[`no-newline.js 3`] = `
+exports[`no-newline.js-typescript 1`] = `
 "\\"use strict\\";
 a
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -147,7 +147,7 @@ a;
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-babylon 1`] = `
 "\\"use strict\\";
 
 function fn() {
@@ -162,7 +162,7 @@ function fn() {
 "
 `;
 
-exports[`test.js 2`] = `
+exports[`test.js-flow 1`] = `
 "\\"use strict\\";
 
 function fn() {
@@ -177,7 +177,7 @@ function fn() {
 "
 `;
 
-exports[`test.js 3`] = `
+exports[`test.js-typescript 1`] = `
 "\\"use strict\\";
 
 function fn() {
diff --git a/tests/do/__snapshots__/jsfmt.spec.js.snap b/tests/do/__snapshots__/jsfmt.spec.js.snap
index 4fd7295ab..0dae9e4b6 100644
--- a/tests/do/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/do/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`do.js 1`] = `
+exports[`do.js-babylon 1`] = `
 "const envSpecific = {
   domain:
     do {
diff --git a/tests/dynamic_import/__snapshots__/jsfmt.spec.js.snap b/tests/dynamic_import/__snapshots__/jsfmt.spec.js.snap
index be41fd386..e953a6bc8 100644
--- a/tests/dynamic_import/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/dynamic_import/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-babylon 1`] = `
 "import(\\"module.js\\");
 import(\\"module.js\\").then((a) => a);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/empty_paren_comment/__snapshots__/jsfmt.spec.js.snap b/tests/empty_paren_comment/__snapshots__/jsfmt.spec.js.snap
index 3e0a3efc2..beec8ed86 100644
--- a/tests/empty_paren_comment/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/empty_paren_comment/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`empty_paren_comment.js 1`] = `
+exports[`empty_paren_comment.js-babylon 1`] = `
 "let f = (/* ... */) => {}
 (function (/* ... */) {})(/* ... */)
 function f(/* ... */) {}
@@ -55,7 +55,7 @@ f(/* ... */ a, b);
 "
 `;
 
-exports[`empty_paren_comment.js 2`] = `
+exports[`empty_paren_comment.js-flow 1`] = `
 "let f = (/* ... */) => {}
 (function (/* ... */) {})(/* ... */)
 function f(/* ... */) {}
diff --git a/tests/empty_statement/__snapshots__/jsfmt.spec.js.snap b/tests/empty_statement/__snapshots__/jsfmt.spec.js.snap
index 4e237c71b..bfe8f31a8 100644
--- a/tests/empty_statement/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/empty_statement/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`body.js 1`] = `
+exports[`body.js-flow 1`] = `
 "with (a);
 if (1); else if (2); else;
 for (;;);
@@ -22,7 +22,7 @@ while (1);
 "
 `;
 
-exports[`body.js 2`] = `
+exports[`body.js-typescript 1`] = `
 "with (a);
 if (1); else if (2); else;
 for (;;);
diff --git a/tests/es6modules/__snapshots__/jsfmt.spec.js.snap b/tests/es6modules/__snapshots__/jsfmt.spec.js.snap
index c10231b6f..8152f9793 100644
--- a/tests/es6modules/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/es6modules/__snapshots__/jsfmt.spec.js.snap
@@ -1,139 +1,139 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`export_default_arrow_expression.js 1`] = `
+exports[`export_default_arrow_expression.js-babylon 1`] = `
 "export default () => {};
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default () => {};
 "
 `;
 
-exports[`export_default_arrow_expression.js 2`] = `
+exports[`export_default_arrow_expression.js-flow 1`] = `
 "export default () => {};
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default () => {};
 "
 `;
 
-exports[`export_default_call_expression.js 1`] = `
+exports[`export_default_call_expression.js-babylon 1`] = `
 "export default foo()
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default foo();
 "
 `;
 
-exports[`export_default_call_expression.js 2`] = `
+exports[`export_default_call_expression.js-flow 1`] = `
 "export default foo()
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default foo();
 "
 `;
 
-exports[`export_default_class_declaration.js 1`] = `
+exports[`export_default_class_declaration.js-babylon 1`] = `
 "export default class Foo {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default class Foo {}
 "
 `;
 
-exports[`export_default_class_declaration.js 2`] = `
+exports[`export_default_class_declaration.js-flow 1`] = `
 "export default class Foo {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default class Foo {}
 "
 `;
 
-exports[`export_default_class_expression.js 1`] = `
+exports[`export_default_class_expression.js-babylon 1`] = `
 "export default (class foobar {})
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default (class foobar {});
 "
 `;
 
-exports[`export_default_class_expression.js 2`] = `
+exports[`export_default_class_expression.js-flow 1`] = `
 "export default (class foobar {})
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default (class foobar {});
 "
 `;
 
-exports[`export_default_function_declaration.js 1`] = `
+exports[`export_default_function_declaration.js-babylon 1`] = `
 "export default function() {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default function() {}
 "
 `;
 
-exports[`export_default_function_declaration.js 2`] = `
+exports[`export_default_function_declaration.js-flow 1`] = `
 "export default function() {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default function() {}
 "
 `;
 
-exports[`export_default_function_declaration_async.js 1`] = `
-"export default async function foo() {}
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-export default (async function foo() {});
-"
-`;
-
-exports[`export_default_function_declaration_async.js 2`] = `
+exports[`export_default_function_declaration_async.js-babylon 1`] = `
 "export default async function foo() {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default async function foo() {}
 "
 `;
 
-exports[`export_default_function_declaration_named.js 1`] = `
+exports[`export_default_function_declaration_async.js-flow 1`] = `
+"export default async function foo() {}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+export default (async function foo() {});
+"
+`;
+
+exports[`export_default_function_declaration_named.js-babylon 1`] = `
 "export default function f(){}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default function f() {}
 "
 `;
 
-exports[`export_default_function_declaration_named.js 2`] = `
+exports[`export_default_function_declaration_named.js-flow 1`] = `
 "export default function f(){}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default function f() {}
 "
 `;
 
-exports[`export_default_function_expression.js 1`] = `
+exports[`export_default_function_expression.js-babylon 1`] = `
 "export default (function() {});
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default (function() {});
 "
 `;
 
-exports[`export_default_function_expression.js 2`] = `
+exports[`export_default_function_expression.js-flow 1`] = `
 "export default (function() {});
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default (function() {});
 "
 `;
 
-exports[`export_default_function_expression_named.js 1`] = `
+exports[`export_default_function_expression_named.js-babylon 1`] = `
 "export default (function f(){})
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default (function f() {});
 "
 `;
 
-exports[`export_default_function_expression_named.js 2`] = `
+exports[`export_default_function_expression_named.js-flow 1`] = `
 "export default (function f(){})
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default (function f() {});
 "
 `;
 
-exports[`export_default_new_expression.js 1`] = `
+exports[`export_default_new_expression.js-babylon 1`] = `
 "export default new Foo();
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default new Foo();
 "
 `;
 
-exports[`export_default_new_expression.js 2`] = `
+exports[`export_default_new_expression.js-flow 1`] = `
 "export default new Foo();
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default new Foo();
diff --git a/tests/export/__snapshots__/jsfmt.spec.js.snap b/tests/export/__snapshots__/jsfmt.spec.js.snap
index 3b651180e..846c21416 100644
--- a/tests/export/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/export/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`bracket.js 1`] = `
+exports[`bracket.js-flow 1`] = `
 "export {
   runTaskForChanged,
   description,
@@ -27,7 +27,7 @@ export { fitsIn, oneLine };
 "
 `;
 
-exports[`bracket.js 2`] = `
+exports[`bracket.js-flow 2`] = `
 "export {
   runTaskForChanged,
   description,
@@ -54,7 +54,7 @@ export {fitsIn, oneLine};
 "
 `;
 
-exports[`bracket.js 3`] = `
+exports[`bracket.js-typescript 1`] = `
 "export {
   runTaskForChanged,
   description,
@@ -81,7 +81,7 @@ export { fitsIn, oneLine };
 "
 `;
 
-exports[`bracket.js 4`] = `
+exports[`bracket.js-typescript 2`] = `
 "export {
   runTaskForChanged,
   description,
@@ -108,7 +108,7 @@ export {fitsIn, oneLine};
 "
 `;
 
-exports[`empty.js 1`] = `
+exports[`empty.js-flow 1`] = `
 "export {};
 export {} from \\".\\";
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -117,7 +117,7 @@ export {} from \\".\\";
 "
 `;
 
-exports[`empty.js 2`] = `
+exports[`empty.js-flow 2`] = `
 "export {};
 export {} from \\".\\";
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -126,7 +126,7 @@ export {} from \\".\\";
 "
 `;
 
-exports[`empty.js 3`] = `
+exports[`empty.js-typescript 1`] = `
 "export {};
 export {} from \\".\\";
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -135,7 +135,7 @@ export {} from \\".\\";
 "
 `;
 
-exports[`empty.js 4`] = `
+exports[`empty.js-typescript 2`] = `
 "export {};
 export {} from \\".\\";
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/export_default/__snapshots__/jsfmt.spec.js.snap b/tests/export_default/__snapshots__/jsfmt.spec.js.snap
index d54eaf6dc..3eb7f2718 100644
--- a/tests/export_default/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/export_default/__snapshots__/jsfmt.spec.js.snap
@@ -1,13 +1,13 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`body.js 1`] = `
+exports[`body.js-flow 1`] = `
 "export default (class {}[1] = 1);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default (class {}[1] = 1);
 "
 `;
 
-exports[`body.js 2`] = `
+exports[`body.js-typescript 1`] = `
 "export default (class {}[1] = 1);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export default (class {}[1] = 1);
diff --git a/tests/export_extension/__snapshots__/jsfmt.spec.js.snap b/tests/export_extension/__snapshots__/jsfmt.spec.js.snap
index 460e2bfc2..2e2a83096 100644
--- a/tests/export_extension/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/export_extension/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`export.js 1`] = `
+exports[`export.js-babylon 1`] = `
 "export * as ns from 'mod';
 export v from 'mod';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/exports/__snapshots__/jsfmt.spec.js.snap b/tests/exports/__snapshots__/jsfmt.spec.js.snap
index 2e871ee53..4797a0429 100644
--- a/tests/exports/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/exports/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-babylon 1`] = `
 "export { value1, value2 as value2_renamed, value3, value4 as value4_renamed, value5 } from \\"exports\\";
 
 export a,{b} from \\"./baz\\";
diff --git a/tests/expression_statement/__snapshots__/jsfmt.spec.js.snap b/tests/expression_statement/__snapshots__/jsfmt.spec.js.snap
index c6b6fd305..227ee0914 100644
--- a/tests/expression_statement/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/expression_statement/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`no_regression.js 1`] = `
+exports[`no_regression.js-babylon 1`] = `
 "// Ensure no regression.
 \\"use strict\\";
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -9,7 +9,7 @@ exports[`no_regression.js 1`] = `
 "
 `;
 
-exports[`use_strict.js 1`] = `
+exports[`use_strict.js-babylon 1`] = `
 "// Parentheses around expression statement should be preserved in this case.
 (\\"use strict\\");
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/first_argument_expansion/__snapshots__/jsfmt.spec.js.snap b/tests/first_argument_expansion/__snapshots__/jsfmt.spec.js.snap
index 6b86606bb..03b325d3a 100644
--- a/tests/first_argument_expansion/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/first_argument_expansion/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "setTimeout(function() {
   thing();
 }, 500);
diff --git a/tests/flow/abnormal/__snapshots__/jsfmt.spec.js.snap b/tests/flow/abnormal/__snapshots__/jsfmt.spec.js.snap
index 3434a6bb6..220d73b14 100644
--- a/tests/flow/abnormal/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/abnormal/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`break-continue.js 1`] = `
+exports[`break-continue.js-flow 1`] = `
 "function foo() {
     while(true) { break; }
 }
@@ -23,7 +23,7 @@ function bar() {
 "
 `;
 
-exports[`return.js 1`] = `
+exports[`return.js-flow 1`] = `
 "function bar(x:number) { }
 function foo() {
     var x = null;
diff --git a/tests/flow/annot/__snapshots__/jsfmt.spec.js.snap b/tests/flow/annot/__snapshots__/jsfmt.spec.js.snap
index 824a6d115..d9a228318 100644
--- a/tests/flow/annot/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/annot/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`annot.js 1`] = `
+exports[`annot.js-flow 1`] = `
 "function foo(str:string, i:number):string {
   return str;
 }
@@ -194,7 +194,7 @@ type f = ?arg => void;
 "
 `;
 
-exports[`forward_ref.js 1`] = `
+exports[`forward_ref.js-flow 1`] = `
 "let myClassInstance: MyClass = null; // forward ref ok, null ~> class error
 
 function bar(): MyClass {
@@ -229,7 +229,7 @@ function foo() {
 "
 `;
 
-exports[`issue-530.js 1`] = `
+exports[`issue-530.js-flow 1`] = `
 "function foo(...args: any) { }
 
 module.exports = foo;
@@ -240,7 +240,7 @@ module.exports = foo;
 "
 `;
 
-exports[`leak.js 1`] = `
+exports[`leak.js-flow 1`] = `
 "/** @flow */
 
 /* This test documents an example we ran into of a type annotation leaking.
@@ -289,7 +289,7 @@ function bar(y: MyObj): string {
 "
 `;
 
-exports[`other.js 1`] = `
+exports[`other.js-flow 1`] = `
 "class C { }
 module.exports = (C: any);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -298,7 +298,7 @@ module.exports = (C: any);
 "
 `;
 
-exports[`scope.js 1`] = `
+exports[`scope.js-flow 1`] = `
 "type Merge<T> = (a: T, b: T) => T;
 
 // hypothetical immutable map
@@ -355,7 +355,7 @@ class Foo<A> {
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "var C = require('./other');
 ((0: C): string);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/annot/any/__snapshots__/jsfmt.spec.js.snap b/tests/flow/annot/any/__snapshots__/jsfmt.spec.js.snap
index 2232cb0e0..1766566e1 100644
--- a/tests/flow/annot/any/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/annot/any/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "type T = any;
 
 export default class {
@@ -23,7 +23,7 @@ export default class {
 "
 `;
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "import A from \\"./A\\"
 
 class B extends A {
diff --git a/tests/flow/annot2/__snapshots__/jsfmt.spec.js.snap b/tests/flow/annot2/__snapshots__/jsfmt.spec.js.snap
index 331453070..b792b47bd 100644
--- a/tests/flow/annot2/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/annot2/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "/**
  * @providesModule A
  * @flow
@@ -33,7 +33,7 @@ export default class {
 "
 `;
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -56,7 +56,7 @@ class B extends A {
 "
 `;
 
-exports[`T.js 1`] = `
+exports[`T.js-flow 1`] = `
 "/**
  * @providesModule T
  */
diff --git a/tests/flow/any/__snapshots__/jsfmt.spec.js.snap b/tests/flow/any/__snapshots__/jsfmt.spec.js.snap
index 2404ac011..c5752d88d 100644
--- a/tests/flow/any/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/any/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`any.js 1`] = `
+exports[`any.js-flow 1`] = `
 "// @flow
 
 function foo(x:any):any { return x; }
@@ -29,7 +29,7 @@ var z: string = qux(0);
 "
 `;
 
-exports[`anyexportflowfile.js 1`] = `
+exports[`anyexportflowfile.js-flow 1`] = `
 "// @flow
 
 module.exports = ((x: any) => x: any);
@@ -40,7 +40,7 @@ module.exports = ((x: any) => x: any);
 "
 `;
 
-exports[`flowfixme.js 1`] = `
+exports[`flowfixme.js-flow 1`] = `
 "/*
   FlowFixMe is a synonym for any, used by the Flow team to
   signal a needed mod to JS devs.
@@ -91,7 +91,7 @@ var w: string = baz(0);
 "
 `;
 
-exports[`flowissue.js 1`] = `
+exports[`flowissue.js-flow 1`] = `
 "/*
   $FlowIssue is a synonym for any, used by JS devs to signal
   a potential typechecker bug to the Flow team.
@@ -142,7 +142,7 @@ var w: string = baz(0);
 "
 `;
 
-exports[`nonflowfile.js 1`] = `
+exports[`nonflowfile.js-flow 1`] = `
 "// @noflow
 
 module.exports = (x) => x;
@@ -153,7 +153,7 @@ module.exports = x => x;
 "
 `;
 
-exports[`propagate.js 1`] = `
+exports[`propagate.js-flow 1`] = `
 "// @flow
 
 declare class C {
@@ -208,7 +208,7 @@ function bar2(x: mixed) {
 "
 `;
 
-exports[`reach.js 1`] = `
+exports[`reach.js-flow 1`] = `
 "/**
  * like class and function values, any-typed values may be used in
  * type annotations. Here we test propagation of any through the
diff --git a/tests/flow/arith/__snapshots__/jsfmt.spec.js.snap b/tests/flow/arith/__snapshots__/jsfmt.spec.js.snap
index 7996a15ff..d115695e2 100644
--- a/tests/flow/arith/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/arith/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Arith.js 1`] = `
+exports[`Arith.js-flow 1`] = `
 "
 /* @providesModule Arith */
 
@@ -186,7 +186,7 @@ let tests = [
 "
 `;
 
-exports[`exponent.js 1`] = `
+exports[`exponent.js-flow 1`] = `
 "/* @flow */
 
 let x: number = 2 ** 3;
@@ -213,7 +213,7 @@ y **= 2; // error
 "
 `;
 
-exports[`generic.js 1`] = `
+exports[`generic.js-flow 1`] = `
 "/* @flow */
 
 function f<A>(a: A): A { return a + a; } // error
@@ -242,7 +242,7 @@ function f<A, B>(a: A, b: B): B {
 "
 `;
 
-exports[`mult.js 1`] = `
+exports[`mult.js-flow 1`] = `
 "/* @flow */
 
 function num(x:number) { }
@@ -271,7 +271,7 @@ y *= 2; // error
 "
 `;
 
-exports[`relational.js 1`] = `
+exports[`relational.js-flow 1`] = `
 "/* @flow */
 
 (1 < 2);
diff --git a/tests/flow/array-filter/__snapshots__/jsfmt.spec.js.snap b/tests/flow/array-filter/__snapshots__/jsfmt.spec.js.snap
index 392a38943..286af0d80 100644
--- a/tests/flow/array-filter/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/array-filter/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "/* @flow */
 
 function filterOutVoids<T> (arr: Array<?T>): Array<T> {
@@ -23,7 +23,7 @@ function filterOutSmall(arr: Array<?number>): Array<?number> {
 "
 `;
 
-exports[`test2.js 1`] = `
+exports[`test2.js-flow 1`] = `
 "/* @flow */
 
 function filterItems(items: Array<string|number>): Array<string|number> {
diff --git a/tests/flow/array_spread/__snapshots__/jsfmt.spec.js.snap b/tests/flow/array_spread/__snapshots__/jsfmt.spec.js.snap
index 458cf3147..4907fea13 100644
--- a/tests/flow/array_spread/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/array_spread/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "var A = [1,2,3];
 var B = [...A];
 var C = [1,2,3];
diff --git a/tests/flow/arraylib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/arraylib/__snapshots__/jsfmt.spec.js.snap
index c6ec7c02a..d415f4ddc 100644
--- a/tests/flow/arraylib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/arraylib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`array_lib.js 1`] = `
+exports[`array_lib.js-flow 1`] = `
 "/* @flow */
 function foo(x:string) { }
 
diff --git a/tests/flow/arrays/__snapshots__/jsfmt.spec.js.snap b/tests/flow/arrays/__snapshots__/jsfmt.spec.js.snap
index b98fa23dc..4468f0b42 100644
--- a/tests/flow/arrays/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/arrays/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Arrays.js 1`] = `
+exports[`Arrays.js-flow 1`] = `
 "
 /* @providesModule Arrays */
 
@@ -82,7 +82,7 @@ module.exports = \\"arrays\\";
 "
 `;
 
-exports[`comments.js 1`] = `
+exports[`comments.js-flow 1`] = `
 "export type FileMetaData = [
   /* id */ string,
   /* mtime */ number,
@@ -103,7 +103,7 @@ export type ModuleMetaData = [Path, /* type */ number];
 "
 `;
 
-exports[`numeric_elem.js 1`] = `
+exports[`numeric_elem.js-flow 1`] = `
 "var arr = [];
 var day = new Date;
 
@@ -122,7 +122,7 @@ arr[day] = 0;
 "
 `;
 
-exports[`union.js 1`] = `
+exports[`union.js-flow 1`] = `
 "let arr: (number|string)[] = [];
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 let arr: (number | string)[] = [];
diff --git a/tests/flow/arrows/__snapshots__/jsfmt.spec.js.snap b/tests/flow/arrows/__snapshots__/jsfmt.spec.js.snap
index 16371dee8..f6f4821ba 100644
--- a/tests/flow/arrows/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/arrows/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`advanced_arrows.js 1`] = `
+exports[`advanced_arrows.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -27,7 +27,7 @@ var ident = <T>(x: T): T => x;
 "
 `;
 
-exports[`arrows.js 1`] = `
+exports[`arrows.js-flow 1`] = `
 "function selectBestEffortImageForWidth(
     maxWidth: number,
     images: Array<Image>
diff --git a/tests/flow/async/__snapshots__/jsfmt.spec.js.snap b/tests/flow/async/__snapshots__/jsfmt.spec.js.snap
index 623b46c99..7e5ee5fb6 100644
--- a/tests/flow/async/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/async/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`async.js 1`] = `
+exports[`async.js-flow 1`] = `
 "// @flow
 
 // \\"For async functions, a Promise<T> is returned,
@@ -117,7 +117,7 @@ var objf: () => Promise<number> = obj.f;
 "
 `;
 
-exports[`async_base_class.js 1`] = `
+exports[`async_base_class.js-flow 1`] = `
 "// This is kind of weird, but it should parse. This works in babel without the
 // parens around (await promise). From the es6 and async/await specs I (nmote)
 // am not clear on whether it should. In any case it's a strange corner case
@@ -150,7 +150,7 @@ async function foo() {
 "
 `;
 
-exports[`async_parse.js 1`] = `
+exports[`async_parse.js-flow 1`] = `
 "async function f() {}
 async function ft<T>(a: T) {}
 
@@ -203,7 +203,7 @@ var y = { async };
 "
 `;
 
-exports[`async_promise.js 1`] = `
+exports[`async_promise.js-flow 1`] = `
 "async function f(): Promise<number> {
   return Promise.resolve(1);
 }
@@ -214,7 +214,7 @@ async function f(): Promise<number> {
 "
 `;
 
-exports[`async_return_void.js 1`] = `
+exports[`async_return_void.js-flow 1`] = `
 "// @flow
 
 async function foo1(): Promise<string> {
@@ -247,7 +247,7 @@ async function foo3(): Promise<string> {
 "
 `;
 
-exports[`async2.js 1`] = `
+exports[`async2.js-flow 1`] = `
 "// @flow
 
 // misc basic
@@ -374,7 +374,7 @@ function test5() {
 "
 `;
 
-exports[`async3.js 1`] = `
+exports[`async3.js-flow 1`] = `
 "// @flow
 
 /**
@@ -442,7 +442,7 @@ async function baz() {
 "
 `;
 
-exports[`await_parse.js 1`] = `
+exports[`await_parse.js-flow 1`] = `
 "async function f() { await 1; }
 async function ft<T>(a: T) { await 1; }
 
diff --git a/tests/flow/async_iteration/__snapshots__/jsfmt.spec.js.snap b/tests/flow/async_iteration/__snapshots__/jsfmt.spec.js.snap
index 5a62f4532..f7ebc1665 100644
--- a/tests/flow/async_iteration/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/async_iteration/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`delegate_yield.js 1`] = `
+exports[`delegate_yield.js-flow 1`] = `
 "async function *delegate_next() {
   async function *inner() {
     var x: void = yield; // error: number ~> void
@@ -57,7 +57,7 @@ async function* delegate_return() {
 "
 `;
 
-exports[`generator.js 1`] = `
+exports[`generator.js-flow 1`] = `
 "declare interface File {
   readLine(): Promise<string>;
   close(): void;
@@ -112,7 +112,7 @@ async function f() {
 "
 `;
 
-exports[`return.js 1`] = `
+exports[`return.js-flow 1`] = `
 "declare var gen: AsyncGenerator<void,string,void>;
 
 // You can pass whatever you like to return, it doesn't need to be related to
@@ -161,7 +161,7 @@ refuse_return().return(\\"string\\").then(result => {
 "
 `;
 
-exports[`throw.js 1`] = `
+exports[`throw.js-flow 1`] = `
 "async function *catch_return() {
   try {
     yield 0;
diff --git a/tests/flow/autocomplete/__snapshots__/jsfmt.spec.js.snap b/tests/flow/autocomplete/__snapshots__/jsfmt.spec.js.snap
index 478e73aed..980f8654a 100644
--- a/tests/flow/autocomplete/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/autocomplete/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`customfun.js 1`] = `
+exports[`customfun.js-flow 1`] = `
 "// @flow
 
 declare var idx: $Facebookism$Idx;
@@ -27,7 +27,7 @@ m;
 "
 `;
 
-exports[`unknown.js 1`] = `
+exports[`unknown.js-flow 1`] = `
 "// @noflow
 module.exports = { x: { y: \\"\\" } };
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/auxiliary/__snapshots__/jsfmt.spec.js.snap b/tests/flow/auxiliary/__snapshots__/jsfmt.spec.js.snap
index 4687a8d8e..3c73ceff6 100644
--- a/tests/flow/auxiliary/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/auxiliary/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`client.js 1`] = `
+exports[`client.js-flow 1`] = `
 "var y:number = x;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 var y: number = x;
diff --git a/tests/flow/auxiliary/lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/auxiliary/lib/__snapshots__/jsfmt.spec.js.snap
index 5180d35de..2c45be131 100644
--- a/tests/flow/auxiliary/lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/auxiliary/lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`lib.js 1`] = `
+exports[`lib.js-flow 1`] = `
 "declare var x: string;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 declare var x: string;
diff --git a/tests/flow/binary/__snapshots__/jsfmt.spec.js.snap b/tests/flow/binary/__snapshots__/jsfmt.spec.js.snap
index 8f5a54fcb..9322aad1c 100644
--- a/tests/flow/binary/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/binary/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`in.js 1`] = `
+exports[`in.js-flow 1`] = `
 "// @flow
 
 let tests = [
diff --git a/tests/flow/binding/__snapshots__/jsfmt.spec.js.snap b/tests/flow/binding/__snapshots__/jsfmt.spec.js.snap
index 1ee41050c..863b34e49 100644
--- a/tests/flow/binding/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/binding/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`const.js 1`] = `
+exports[`const.js-flow 1`] = `
 "const x = 0;
 
 // errors: const cannot be reassigned
@@ -59,7 +59,7 @@ for (const { baz } of bazzes) {
 "
 `;
 
-exports[`rebinding.js 1`] = `
+exports[`rebinding.js-flow 1`] = `
 "/* @flow
  * test errors on illegal rebinding/reassignment
  *
@@ -458,7 +458,7 @@ function fn_params_clash_fn_binding(x, y) {
 "
 `;
 
-exports[`scope.js 1`] = `
+exports[`scope.js-flow 1`] = `
 "function block_scope() {
   let a: number = 0;
   var b: number = 0;
@@ -687,7 +687,7 @@ function default_param_2() {
 "
 `;
 
-exports[`tdz.js 1`] = `
+exports[`tdz.js-flow 1`] = `
 "/** @flow */
 
 // -- types ---
diff --git a/tests/flow/bom/__snapshots__/jsfmt.spec.js.snap b/tests/flow/bom/__snapshots__/jsfmt.spec.js.snap
index 7a8c5584c..02a5f00b7 100644
--- a/tests/flow/bom/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/bom/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`FormData.js 1`] = `
+exports[`FormData.js-flow 1`] = `
 "/* @flow */
 
 // constructor
@@ -148,7 +148,7 @@ for (let [x, y]: [number, number] of a.entries()) {
 "
 `;
 
-exports[`MutationObserver.js 1`] = `
+exports[`MutationObserver.js-flow 1`] = `
 "/* @flow */
 
 // constructor
diff --git a/tests/flow/bounded_poly/__snapshots__/jsfmt.spec.js.snap b/tests/flow/bounded_poly/__snapshots__/jsfmt.spec.js.snap
index 2698f0005..f2619b2c7 100644
--- a/tests/flow/bounded_poly/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/bounded_poly/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`scope.js 1`] = `
+exports[`scope.js-flow 1`] = `
 "function foo<X, Y:X>(x:X, y:Y):void { }
 foo(0, \\"\\");
 
@@ -15,7 +15,7 @@ function bar<X: number, Y: X>(x: X, y: Y): number {
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "function foo<T: number>(x: T): T {
     var _ = x * 1; // OK
     var y: string = x; // error
diff --git a/tests/flow/break/__snapshots__/jsfmt.spec.js.snap b/tests/flow/break/__snapshots__/jsfmt.spec.js.snap
index e6819ea80..34f1ae9ce 100644
--- a/tests/flow/break/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/break/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`break.js 1`] = `
+exports[`break.js-flow 1`] = `
 "function foo(b) {
     var x = b ? null: false;
     var z;
diff --git a/tests/flow/builtin_uses/__snapshots__/jsfmt.spec.js.snap b/tests/flow/builtin_uses/__snapshots__/jsfmt.spec.js.snap
index 8951f4bd7..89238873c 100644
--- a/tests/flow/builtin_uses/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/builtin_uses/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "var o = Object.freeze({ foo: 0 });
 (o.foo: string);
 module.exports = o;
@@ -11,7 +11,7 @@ module.exports = o;
 "
 `;
 
-exports[`test2.js 1`] = `
+exports[`test2.js-flow 1`] = `
 "var o = require('./test');
 (o.foo: string);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/builtins/__snapshots__/jsfmt.spec.js.snap b/tests/flow/builtins/__snapshots__/jsfmt.spec.js.snap
index 86a1670bc..bc960dc47 100644
--- a/tests/flow/builtins/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/builtins/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`array.js 1`] = `
+exports[`array.js-flow 1`] = `
 "var a = [\\"...\\"];
 var b = a.map (function (x) { return 0; });
 var c: string = b[0]; // error: number !~> string
@@ -45,7 +45,7 @@ function g() {
 "
 `;
 
-exports[`genericfoo.js 1`] = `
+exports[`genericfoo.js-flow 1`] = `
 "class Foo<T> {
     x:T;
     self():Foo<T> { return this; }
diff --git a/tests/flow/call_properties/__snapshots__/jsfmt.spec.js.snap b/tests/flow/call_properties/__snapshots__/jsfmt.spec.js.snap
index 18494e19e..2f51971ad 100644
--- a/tests/flow/call_properties/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/call_properties/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "// You should be able to call objects with call properties
 function a(f: { (): string }, g: { (x: number): string } ): string {
   return f() + g(123);
@@ -65,7 +65,7 @@ function f(): number {
 "
 `;
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "// You should be able to use a function as an object with a call property
 var a: { (x: number): string } = function (x: number): string { return \\"hi\\"; };
 
@@ -124,7 +124,7 @@ var z: Object = function(x: number): string {
 "
 `;
 
-exports[`C.js 1`] = `
+exports[`C.js-flow 1`] = `
 "// You should be able to use an object as a function
 function a(x: { (z: number): string }): (z: number) => string {
   return x;
@@ -197,7 +197,7 @@ function g(x: {}): Function {
 "
 `;
 
-exports[`D.js 1`] = `
+exports[`D.js-flow 1`] = `
 "// Multiple call properties should also be supported
 function a(f: { (): string; (x: number): string }): string {
   return f() + f(123);
@@ -248,7 +248,7 @@ function e(x: { (): string, (x: number): string }): () => number {
 "
 `;
 
-exports[`E.js 1`] = `
+exports[`E.js-flow 1`] = `
 "// Expecting properties that don't exist should be an error
 var a : { someProp: number } = function () {};
 
@@ -273,7 +273,7 @@ var c: { myProp: number } = f;
 "
 `;
 
-exports[`F.js 1`] = `
+exports[`F.js-flow 1`] = `
 "// You should be able to use an arrow function as an object with a call property
 
 var a: { (x: number): string } = (x) => x.toString()
diff --git a/tests/flow/callable/__snapshots__/jsfmt.spec.js.snap b/tests/flow/callable/__snapshots__/jsfmt.spec.js.snap
index 2fdbc337f..6637715c1 100644
--- a/tests/flow/callable/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/callable/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`optional.js 1`] = `
+exports[`optional.js-flow 1`] = `
 "type F = {
   (x: string): number;
   p?: string;
@@ -25,7 +25,7 @@ function f(x) {
 "
 `;
 
-exports[`primitives.js 1`] = `
+exports[`primitives.js-flow 1`] = `
 "var x = Boolean(4);
 function foo(fn:(value:any)=>boolean) { }
 foo(Boolean);
diff --git a/tests/flow/check-contents/__snapshots__/jsfmt.spec.js.snap b/tests/flow/check-contents/__snapshots__/jsfmt.spec.js.snap
index ce33d0702..c12e07ddc 100644
--- a/tests/flow/check-contents/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/check-contents/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`not_flow.js 1`] = `
+exports[`not_flow.js-flow 1`] = `
 "1 * 'foo';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1 * \\"foo\\";
diff --git a/tests/flow/class_munging/__snapshots__/jsfmt.spec.js.snap b/tests/flow/class_munging/__snapshots__/jsfmt.spec.js.snap
index db48dcb2c..e5a76ca28 100644
--- a/tests/flow/class_munging/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/class_munging/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`with_munging.js 1`] = `
+exports[`with_munging.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -35,7 +35,7 @@ class Bar extends Foo {
 "
 `;
 
-exports[`without_munging.js 1`] = `
+exports[`without_munging.js-flow 1`] = `
 "/**
  * @flow
  * @preventMunge
diff --git a/tests/flow/class_statics/__snapshots__/jsfmt.spec.js.snap b/tests/flow/class_statics/__snapshots__/jsfmt.spec.js.snap
index cf38583f1..055fb06a1 100644
--- a/tests/flow/class_statics/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/class_statics/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "class A {
   static x: number;
   static y: string;
diff --git a/tests/flow/class_subtyping/__snapshots__/jsfmt.spec.js.snap b/tests/flow/class_subtyping/__snapshots__/jsfmt.spec.js.snap
index 3d3d43382..cd1a0cbe5 100644
--- a/tests/flow/class_subtyping/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/class_subtyping/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "/* @flow */
 class A {}
 class B {}
@@ -15,7 +15,7 @@ module.exports = { A, B };
 "
 `;
 
-exports[`test2.js 1`] = `
+exports[`test2.js-flow 1`] = `
 "/* @flow */
 var I = require(\\"./test.js\\");
 
@@ -34,7 +34,7 @@ var y: I.B = new C();
 "
 `;
 
-exports[`test3.js 1`] = `
+exports[`test3.js-flow 1`] = `
 "class A<X, Y, Z> {}
 class B extends A<string, number, bool> {}
 class C<X, Y, Z> extends B {}
@@ -51,7 +51,7 @@ var a: A<string, number, Array<boolean>> = c; // the third type arg is incorrect
 "
 `;
 
-exports[`test4.js 1`] = `
+exports[`test4.js-flow 1`] = `
 "class C<X> { x: X; }
 
 function foo<X>(c: C<X>, x: X) { }
diff --git a/tests/flow/class_type/__snapshots__/jsfmt.spec.js.snap b/tests/flow/class_type/__snapshots__/jsfmt.spec.js.snap
index 89e01640d..9e38db566 100644
--- a/tests/flow/class_type/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/class_type/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "class A { }
 function foo(x: Class<A>): A {
   return new x(); // OK
@@ -27,7 +27,7 @@ function bar(x: Class<B>): B {
 "
 `;
 
-exports[`test2.js 1`] = `
+exports[`test2.js-flow 1`] = `
 "// A function to typecheck values against their types. Covariance of Class<.>
 // makes it useless in such a function (when limited to classes and instances),
 // since everything can be trivially satisfied by going to \`mixed\`.
diff --git a/tests/flow/classes/__snapshots__/jsfmt.spec.js.snap b/tests/flow/classes/__snapshots__/jsfmt.spec.js.snap
index 206577172..af14b2b5f 100644
--- a/tests/flow/classes/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/classes/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "class A {
   foo(x:number):void { }
 }
@@ -15,7 +15,7 @@ module.exports = A;
 "
 `;
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "var A = require('./A');
 
 class B extends A { }
@@ -36,7 +36,7 @@ module.exports = B;
 "
 `;
 
-exports[`C.js 1`] = `
+exports[`C.js-flow 1`] = `
 "var B = require('./B');
 
 class C extends B {
@@ -61,7 +61,7 @@ module.exports = C;
 "
 `;
 
-exports[`D.js 1`] = `
+exports[`D.js-flow 1`] = `
 "class D { }
 class E { }
 new E().x
@@ -72,7 +72,7 @@ new E().x;
 "
 `;
 
-exports[`class_shapes.js 1`] = `
+exports[`class_shapes.js-flow 1`] = `
 "/* @flow */
 
 type Foo = {
@@ -147,7 +147,7 @@ var w: Foo = z;
 "
 `;
 
-exports[`expr.js 1`] = `
+exports[`expr.js-flow 1`] = `
 "var Bar = class Foo {
   static factory(): Foo { // OK: Foo is a type in this scope
     return new Foo()      // OK: Foo is a runtime binding in this scope
@@ -213,7 +213,7 @@ var alias2: Alias = _Alias.factory(); // error: bad pun
 "
 `;
 
-exports[`loc.js 1`] = `
+exports[`loc.js-flow 1`] = `
 "/* @flow */
 
 type Foo = number
@@ -228,7 +228,7 @@ class Foo {} // error, shadows type Foo
 "
 `;
 
-exports[`statics.js 1`] = `
+exports[`statics.js-flow 1`] = `
 "/* @flow */
 
 class C {
diff --git a/tests/flow/closure/__snapshots__/jsfmt.spec.js.snap b/tests/flow/closure/__snapshots__/jsfmt.spec.js.snap
index 76625bc09..d6fe11ee2 100644
--- a/tests/flow/closure/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/closure/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Closure.js 1`] = `
+exports[`Closure.js-flow 1`] = `
 "/***
  * Test tracking of variable types across closure calls.
  * @flow
@@ -171,7 +171,7 @@ function local_meth() {
 "
 `;
 
-exports[`cond_havoc.js 1`] = `
+exports[`cond_havoc.js-flow 1`] = `
 "// @flow
 
 // from sam, https://github.com/facebook/flow/issues/780
@@ -204,7 +204,7 @@ function example(b: boolean): number {
 "
 `;
 
-exports[`const.js 1`] = `
+exports[`const.js-flow 1`] = `
 "/***
  * consts retain refinements
  * @flow
diff --git a/tests/flow/commonjs/__snapshots__/jsfmt.spec.js.snap b/tests/flow/commonjs/__snapshots__/jsfmt.spec.js.snap
index e0abce678..2c05e643d 100644
--- a/tests/flow/commonjs/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/commonjs/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Abs.js 1`] = `
+exports[`Abs.js-flow 1`] = `
 "
 function f(x:string) { }
 
@@ -12,7 +12,7 @@ module.exports = f;
 "
 `;
 
-exports[`Rel.js 1`] = `
+exports[`Rel.js-flow 1`] = `
 "
 var f = require('./Abs');
 
diff --git a/tests/flow/computed_props/__snapshots__/jsfmt.spec.js.snap b/tests/flow/computed_props/__snapshots__/jsfmt.spec.js.snap
index bf1ffc18e..9eadf1797 100644
--- a/tests/flow/computed_props/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/computed_props/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "var ColorId = {
   RED: 'R',
   GREEN: 'G',
@@ -51,7 +51,7 @@ module.exports = { ColorId, ColorNumber };
 "
 `;
 
-exports[`test2.js 1`] = `
+exports[`test2.js-flow 1`] = `
 "var { ColorId, ColorNumber } = require('./test');
 var ColorIdToNumber = {
   [ColorId.RED]: ColorNumber.RED,
@@ -76,7 +76,7 @@ module.exports = ColorIdToNumber;
 "
 `;
 
-exports[`test3.js 1`] = `
+exports[`test3.js-flow 1`] = `
 "var { ColorId } = require('./test');
 var ColorIdToNumber = require('./test2');
 
@@ -89,14 +89,14 @@ var ColorIdToNumber = require(\\"./test2\\");
 "
 `;
 
-exports[`test4.js 1`] = `
+exports[`test4.js-flow 1`] = `
 "module.exports = 'hello';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 module.exports = \\"hello\\";
 "
 `;
 
-exports[`test5.js 1`] = `
+exports[`test5.js-flow 1`] = `
 "var hello = require('./test4');
 var dummy = require('./test');
 module.exports = {
@@ -115,7 +115,7 @@ module.exports = {
 "
 `;
 
-exports[`test6.js 1`] = `
+exports[`test6.js-flow 1`] = `
 "var o = require('./test5');
 (o.hello: 'nothing'); // oops
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -124,7 +124,7 @@ var o = require(\\"./test5\\");
 "
 `;
 
-exports[`test7.js 1`] = `
+exports[`test7.js-flow 1`] = `
 "var obj = {x: 0, m() { return this.x }}
 var x: string = obj['m'](); // error, number ~> string
 
diff --git a/tests/flow/conditional/__snapshots__/jsfmt.spec.js.snap b/tests/flow/conditional/__snapshots__/jsfmt.spec.js.snap
index e6e2a20ff..51ae4e1ee 100644
--- a/tests/flow/conditional/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/conditional/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`conditional.js 1`] = `
+exports[`conditional.js-flow 1`] = `
 "/* @flow */
 
 function a(): number {
diff --git a/tests/flow/config_all/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_all/__snapshots__/jsfmt.spec.js.snap
index b7196c185..35459c0d1 100644
--- a/tests/flow/config_all/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_all/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`no_at_flow.js 1`] = `
+exports[`no_at_flow.js-flow 1`] = `
 "var x: number = \\"not a number\\"; // Error: string ~> number
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 var x: number = \\"not a number\\"; // Error: string ~> number
diff --git a/tests/flow/config_all_false/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_all_false/__snapshots__/jsfmt.spec.js.snap
index 9dafaf24e..d0d9702ec 100644
--- a/tests/flow/config_all_false/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_all_false/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`no_at_flow.js 1`] = `
+exports[`no_at_flow.js-flow 1`] = `
 "var x: number = \\"not a number\\"; // No error
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 var x: number = \\"not a number\\"; // No error
diff --git a/tests/flow/config_all_weak/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_all_weak/__snapshots__/jsfmt.spec.js.snap
index 66434aa78..5cde37537 100644
--- a/tests/flow/config_all_weak/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_all_weak/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`no_at_flow.js 1`] = `
+exports[`no_at_flow.js-flow 1`] = `
 "var x;
 
 x.length;
diff --git a/tests/flow/config_file_extensions/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_file_extensions/__snapshots__/jsfmt.spec.js.snap
index 7a83d74e7..2f29ec62c 100644
--- a/tests/flow/config_file_extensions/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_file_extensions/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "/*
  * @flow
  */
diff --git a/tests/flow/config_ignore/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_ignore/__snapshots__/jsfmt.spec.js.snap
index 2f54b95c0..16946381b 100644
--- a/tests/flow/config_ignore/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_ignore/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "/* @flow */
 
 // No error, this file is ignored
diff --git a/tests/flow/config_ignore/dir/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_ignore/dir/__snapshots__/jsfmt.spec.js.snap
index b043acce5..badf32f2e 100644
--- a/tests/flow/config_ignore/dir/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_ignore/dir/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "/* @flow */
 
 var x: number = \\"string\\"; // Error string ~> number
diff --git a/tests/flow/config_module_name_mapper_PROJECT_ROOT-1.0/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_module_name_mapper_PROJECT_ROOT-1.0/__snapshots__/jsfmt.spec.js.snap
index cb4e02453..68c468dbe 100644
--- a/tests/flow/config_module_name_mapper_PROJECT_ROOT-1.0/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_module_name_mapper_PROJECT_ROOT-1.0/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`main.js 1`] = `
+exports[`main.js-flow 1`] = `
 "// @flow
 
 import {test} from 'testmodule';
diff --git a/tests/flow/config_module_name_mapper_PROJECT_ROOT-1.0/src/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_module_name_mapper_PROJECT_ROOT-1.0/src/__snapshots__/jsfmt.spec.js.snap
index ed693ef74..77e879c88 100644
--- a/tests/flow/config_module_name_mapper_PROJECT_ROOT-1.0/src/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_module_name_mapper_PROJECT_ROOT-1.0/src/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`testmodule.js 1`] = `
+exports[`testmodule.js-flow 1`] = `
 "// @flow
 
 export let test = 42;
diff --git a/tests/flow/config_module_name_mapper_filetype/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_module_name_mapper_filetype/__snapshots__/jsfmt.spec.js.snap
index 29a008328..4b8a530f0 100644
--- a/tests/flow/config_module_name_mapper_filetype/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_module_name_mapper_filetype/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "// @flow
 
 import {className} from \\"./SomeCSSFile.css\\";
diff --git a/tests/flow/config_module_name_rewrite_haste/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_module_name_rewrite_haste/__snapshots__/jsfmt.spec.js.snap
index 8bb8fc4e7..ead9c2a89 100644
--- a/tests/flow/config_module_name_rewrite_haste/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_module_name_rewrite_haste/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "/* @flow */
 
 var m1 = require('1DoesntExist');
@@ -31,7 +31,7 @@ import { numVal as numVal2 } from \\"3DoesntExist\\"; // Error
 "
 `;
 
-exports[`Exists.js 1`] = `
+exports[`Exists.js-flow 1`] = `
 "/**
  * @providesModule Exists
  * @flow
diff --git a/tests/flow/config_module_name_rewrite_node/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_module_name_rewrite_node/__snapshots__/jsfmt.spec.js.snap
index 39629c769..8e6339326 100644
--- a/tests/flow/config_module_name_rewrite_node/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_module_name_rewrite_node/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "/* @flow */
 
 var m1 = require('./1DoesntExist');
@@ -55,7 +55,7 @@ var c_4: string = numVal3; // Error: number ~> string
 "
 `;
 
-exports[`Exists.js 1`] = `
+exports[`Exists.js-flow 1`] = `
 "/* @flow */
 
 module.exports = {
diff --git a/tests/flow/config_module_system_node_resolve_dirname/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_module_system_node_resolve_dirname/__snapshots__/jsfmt.spec.js.snap
index 8e952737f..8ace7cbd6 100644
--- a/tests/flow/config_module_system_node_resolve_dirname/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_module_system_node_resolve_dirname/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`toplevel.js 1`] = `
+exports[`toplevel.js-flow 1`] = `
 "// @flow
 
 import {name} from \\"testproj\\";
diff --git a/tests/flow/config_module_system_node_resolve_dirname/custom_resolve_dir/testproj/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_module_system_node_resolve_dirname/custom_resolve_dir/testproj/__snapshots__/jsfmt.spec.js.snap
index a62797762..f4dd5af9f 100644
--- a/tests/flow/config_module_system_node_resolve_dirname/custom_resolve_dir/testproj/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_module_system_node_resolve_dirname/custom_resolve_dir/testproj/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`index.js 1`] = `
+exports[`index.js-flow 1`] = `
 "// @flow
 
 export var name: \\"otherdir/testproj\\" = \\"otherdir/testproj\\";
diff --git a/tests/flow/config_module_system_node_resolve_dirname/custom_resolve_dir/testproj2/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_module_system_node_resolve_dirname/custom_resolve_dir/testproj2/__snapshots__/jsfmt.spec.js.snap
index 0b954827c..1dfaa0563 100644
--- a/tests/flow/config_module_system_node_resolve_dirname/custom_resolve_dir/testproj2/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_module_system_node_resolve_dirname/custom_resolve_dir/testproj2/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`index.js 1`] = `
+exports[`index.js-flow 1`] = `
 "// @flow
 
 export var name: \\"otherdir/testproj2\\" = \\"otherdir/testproj2\\";
diff --git a/tests/flow/config_module_system_node_resolve_dirname/subdir/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_module_system_node_resolve_dirname/subdir/__snapshots__/jsfmt.spec.js.snap
index 10be9f9ac..62d411f8d 100644
--- a/tests/flow/config_module_system_node_resolve_dirname/subdir/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_module_system_node_resolve_dirname/subdir/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`sublevel.js 1`] = `
+exports[`sublevel.js-flow 1`] = `
 "// @flow
 
 import {name} from \\"testproj2\\";
diff --git a/tests/flow/config_module_system_node_resolve_dirname/subdir/custom_resolve_dir/testproj2/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_module_system_node_resolve_dirname/subdir/custom_resolve_dir/testproj2/__snapshots__/jsfmt.spec.js.snap
index c63d663fd..564479bb2 100644
--- a/tests/flow/config_module_system_node_resolve_dirname/subdir/custom_resolve_dir/testproj2/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_module_system_node_resolve_dirname/subdir/custom_resolve_dir/testproj2/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`index.js 1`] = `
+exports[`index.js-flow 1`] = `
 "// @flow
 
 export var name: \\"subdir/custom_resolve_dir/testproj2\\" = \\"subdir/custom_resolve_dir/testproj2\\";
diff --git a/tests/flow/config_munging_underscores/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_munging_underscores/__snapshots__/jsfmt.spec.js.snap
index 03e8baf23..9362ee692 100644
--- a/tests/flow/config_munging_underscores/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_munging_underscores/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`chain.js 1`] = `
+exports[`chain.js-flow 1`] = `
 "/* @flow */
 
 class A {
@@ -73,7 +73,7 @@ B._sProperty = \\"B._sProperty string\\";
 "
 `;
 
-exports[`commonjs_export.js 1`] = `
+exports[`commonjs_export.js-flow 1`] = `
 "/* @flow */
 
 class C {
@@ -92,7 +92,7 @@ module.exports = new C();
 "
 `;
 
-exports[`commonjs_import.js 1`] = `
+exports[`commonjs_import.js-flow 1`] = `
 "/* @flow */
 
 import {_p} from \\"./commonjs_export\\";
diff --git a/tests/flow/config_munging_underscores2/__snapshots__/jsfmt.spec.js.snap b/tests/flow/config_munging_underscores2/__snapshots__/jsfmt.spec.js.snap
index 5d87fdbb7..872aa2b0c 100644
--- a/tests/flow/config_munging_underscores2/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/config_munging_underscores2/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`chain.js 1`] = `
+exports[`chain.js-flow 1`] = `
 "/* @flow */
 
 class A {
diff --git a/tests/flow/const_params/__snapshots__/jsfmt.spec.js.snap b/tests/flow/const_params/__snapshots__/jsfmt.spec.js.snap
index e3bf3240b..9aa610ed3 100644
--- a/tests/flow/const_params/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/const_params/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "/**
  * test handling of const params
  * - reassignment prohibited
diff --git a/tests/flow/constructor/__snapshots__/jsfmt.spec.js.snap b/tests/flow/constructor/__snapshots__/jsfmt.spec.js.snap
index f5c85157c..6dd6aed99 100644
--- a/tests/flow/constructor/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/constructor/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`constructor.js 1`] = `
+exports[`constructor.js-flow 1`] = `
 "class C {
     constructor() { }
 }
diff --git a/tests/flow/constructor_annots/__snapshots__/jsfmt.spec.js.snap b/tests/flow/constructor_annots/__snapshots__/jsfmt.spec.js.snap
index 528ae496c..be8f22bfa 100644
--- a/tests/flow/constructor_annots/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/constructor_annots/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`constructors.js 1`] = `
+exports[`constructors.js-flow 1`] = `
 "// Foo is a class-like function
 function Foo() {
   this.x = 0; // constructs objects with property x
@@ -51,7 +51,7 @@ exports.Foo2 = (Foo: Class<IFoo>);
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "var Foo = require('./constructors').Foo;
 var x: string = new Foo().x; // error, found number instead of string
 var y: string = Foo.y; // error, found number instead of string
diff --git a/tests/flow/contents/ignore/__snapshots__/jsfmt.spec.js.snap b/tests/flow/contents/ignore/__snapshots__/jsfmt.spec.js.snap
index 694ce4033..e2c5acd06 100644
--- a/tests/flow/contents/ignore/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/contents/ignore/__snapshots__/jsfmt.spec.js.snap
@@ -1,11 +1,11 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`dummy.js 1`] = `
+exports[`dummy.js-flow 1`] = `
 "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "require('./dummy');
 var xxx = 0;
 xxx
diff --git a/tests/flow/contents/no_flow/__snapshots__/jsfmt.spec.js.snap b/tests/flow/contents/no_flow/__snapshots__/jsfmt.spec.js.snap
index 694ce4033..e2c5acd06 100644
--- a/tests/flow/contents/no_flow/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/contents/no_flow/__snapshots__/jsfmt.spec.js.snap
@@ -1,11 +1,11 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`dummy.js 1`] = `
+exports[`dummy.js-flow 1`] = `
 "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "require('./dummy');
 var xxx = 0;
 xxx
diff --git a/tests/flow/core_tests/__snapshots__/jsfmt.spec.js.snap b/tests/flow/core_tests/__snapshots__/jsfmt.spec.js.snap
index 7d6044832..06b5c76fc 100644
--- a/tests/flow/core_tests/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/core_tests/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`boolean.js 1`] = `
+exports[`boolean.js-flow 1`] = `
 "// @flow
 
 // Boolean (the class) tests. booleans (the literals) are not part of core.js
@@ -89,7 +89,7 @@ let tests = [
 "
 `;
 
-exports[`map.js 1`] = `
+exports[`map.js-flow 1`] = `
 "// @flow
 
 function* generator(): Iterable<[string, number]> {
@@ -158,7 +158,7 @@ let tests = [
 "
 `;
 
-exports[`regexp.js 1`] = `
+exports[`regexp.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -221,7 +221,7 @@ let tests = [
 "
 `;
 
-exports[`weakset.js 1`] = `
+exports[`weakset.js-flow 1`] = `
 "// @flow
 
 let ws = new WeakSet();
diff --git a/tests/flow/covariance/__snapshots__/jsfmt.spec.js.snap b/tests/flow/covariance/__snapshots__/jsfmt.spec.js.snap
index 8659c0a9b..9dc75a6e8 100644
--- a/tests/flow/covariance/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/covariance/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "type CovArrayVerbose<X,Y:X> = Array<Y>;
 var b: CovArrayVerbose<number,*> = [];
 var y: CovArrayVerbose<mixed,*> = b;
diff --git a/tests/flow/coverage/__snapshots__/jsfmt.spec.js.snap b/tests/flow/coverage/__snapshots__/jsfmt.spec.js.snap
index 5f1672f3b..cd3eeb063 100644
--- a/tests/flow/coverage/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/coverage/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`crash.js 1`] = `
+exports[`crash.js-flow 1`] = `
 "// This file triggers a violation of the \\"disjoint-or-nested ranges invariant\\"
 // that we implicitly assume in type-at-pos and coverage implementations. In
 // particular, when unchecked it causes a crash with coverage --color.
@@ -25,7 +25,7 @@ declare module bar {
 "
 `;
 
-exports[`declare_module.js 1`] = `
+exports[`declare_module.js-flow 1`] = `
 "// check coverage of declare module
 
 declare module foo {
@@ -38,7 +38,7 @@ declare module foo {
 "
 `;
 
-exports[`no_pragma.js 1`] = `
+exports[`no_pragma.js-flow 1`] = `
 "let x = 0;
 (x: string);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -47,7 +47,7 @@ let x = 0;
 "
 `;
 
-exports[`non-termination.js 1`] = `
+exports[`non-termination.js-flow 1`] = `
 "// This file triggers a violation of the \\"disjoint-or-nested ranges invariant\\"
 // that we implicitly assume in type-at-pos and coverage implementations. In
 // particular, when unchecked it causes non-termination with coverage --color.
diff --git a/tests/flow/cycle/__snapshots__/jsfmt.spec.js.snap b/tests/flow/cycle/__snapshots__/jsfmt.spec.js.snap
index c607473c5..7537438f0 100644
--- a/tests/flow/cycle/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/cycle/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "var B = require('./B');
 
 class A extends B { }
@@ -15,7 +15,7 @@ module.exports = A;
 "
 `;
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "var A = require('./A');
 
 //class B extends A { }
diff --git a/tests/flow/date/__snapshots__/jsfmt.spec.js.snap b/tests/flow/date/__snapshots__/jsfmt.spec.js.snap
index ab080405f..7fde99128 100644
--- a/tests/flow/date/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/date/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`date.js 1`] = `
+exports[`date.js-flow 1`] = `
 "var d = new Date(0);
 var x:string = d.getTime();
 
diff --git a/tests/flow/declaration_files_haste/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declaration_files_haste/__snapshots__/jsfmt.spec.js.snap
index ac70ad001..5c1e9c7e9 100644
--- a/tests/flow/declaration_files_haste/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declaration_files_haste/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`ExplicitProvidesModuleDifferentName.js 1`] = `
+exports[`ExplicitProvidesModuleDifferentName.js-flow 1`] = `
 "/*
  * @providesModule ExplicitProvidesModuleDifferentName
  * @flow
@@ -17,7 +17,7 @@ module.exports.fun = (): string => \\"hello there\\";
 "
 `;
 
-exports[`ExplicitProvidesModuleSameName.js 1`] = `
+exports[`ExplicitProvidesModuleSameName.js-flow 1`] = `
 "/*
  * @providesModule ExplicitProvidesModuleSameName
  * @flow
@@ -34,7 +34,7 @@ module.exports.fun = (): string => \\"hello there\\";
 "
 `;
 
-exports[`ImplicitProvidesModule.js 1`] = `
+exports[`ImplicitProvidesModule.js-flow 1`] = `
 "/*
  * @providesModule ImplicitProvidesModule
  * @flow
@@ -51,14 +51,14 @@ module.exports.fun = (): string => \\"hello there\\";
 "
 `;
 
-exports[`md5.js 1`] = `
+exports[`md5.js-flow 1`] = `
 "/* @providesModule md5 */
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 /* @providesModule md5 */
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "/* @flow */
 
 var Implicit = require('ImplicitProvidesModule');
diff --git a/tests/flow/declaration_files_haste/external/_d3/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declaration_files_haste/external/_d3/__snapshots__/jsfmt.spec.js.snap
index 8067ca3b3..0d62cda67 100644
--- a/tests/flow/declaration_files_haste/external/_d3/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declaration_files_haste/external/_d3/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`min.js 1`] = `
+exports[`min.js-flow 1`] = `
 "module.exports.fun = (): string => \\"hello there\\";
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 module.exports.fun = (): string => \\"hello there\\";
diff --git a/tests/flow/declaration_files_haste/foo/bar/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declaration_files_haste/foo/bar/__snapshots__/jsfmt.spec.js.snap
index e98d04b0a..54cd068a5 100644
--- a/tests/flow/declaration_files_haste/foo/bar/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declaration_files_haste/foo/bar/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`nested_test.js 1`] = `
+exports[`nested_test.js-flow 1`] = `
 "/* @flow */
 
 var docblock = require('qux/docblock');
diff --git a/tests/flow/declaration_files_haste/ws/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declaration_files_haste/ws/__snapshots__/jsfmt.spec.js.snap
index 3959b3ee8..42591c271 100644
--- a/tests/flow/declaration_files_haste/ws/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declaration_files_haste/ws/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`index.js 1`] = `
+exports[`index.js-flow 1`] = `
 "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 "
 `;
diff --git a/tests/flow/declaration_files_haste/ws/test/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declaration_files_haste/ws/test/__snapshots__/jsfmt.spec.js.snap
index 551421890..deb31ecd9 100644
--- a/tests/flow/declaration_files_haste/ws/test/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declaration_files_haste/ws/test/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`client.js 1`] = `
+exports[`client.js-flow 1`] = `
 "var ws = require('../');
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 var ws = require(\\"../\\");
diff --git a/tests/flow/declaration_files_incremental_haste/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declaration_files_incremental_haste/__snapshots__/jsfmt.spec.js.snap
index 9694ecb5d..3da92710f 100644
--- a/tests/flow/declaration_files_incremental_haste/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declaration_files_incremental_haste/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "/* @providesModule A */
 class Implementation {}
 export function foo(): Implementation { return new Implementation; }
@@ -13,7 +13,7 @@ export function foo(): Implementation {
 "
 `;
 
-exports[`ExplicitProvidesModuleDifferentName.js 1`] = `
+exports[`ExplicitProvidesModuleDifferentName.js-flow 1`] = `
 "/*
  * @providesModule ExplicitProvidesModuleDifferentName
  * @flow
@@ -32,7 +32,7 @@ module.exports.fun = (): Implementation => new Implementation();
 "
 `;
 
-exports[`ExplicitProvidesModuleSameName.js 1`] = `
+exports[`ExplicitProvidesModuleSameName.js-flow 1`] = `
 "/*
  * @providesModule ExplicitProvidesModuleSameName
  * @flow
@@ -51,7 +51,7 @@ module.exports.fun = (): Implementation => new Implementation();
 "
 `;
 
-exports[`ImplicitProvidesModule.js 1`] = `
+exports[`ImplicitProvidesModule.js-flow 1`] = `
 "/*
  * @providesModule ImplicitProvidesModule
  * @flow
@@ -70,14 +70,14 @@ module.exports.fun = (): Implementation => new Implementation();
 "
 `;
 
-exports[`md5.js 1`] = `
+exports[`md5.js-flow 1`] = `
 "/* @providesModule md5 */
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 /* @providesModule md5 */
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "/* @flow */
 
 var Implicit = require('ImplicitProvidesModule');
diff --git a/tests/flow/declaration_files_incremental_haste/external/_d3/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declaration_files_incremental_haste/external/_d3/__snapshots__/jsfmt.spec.js.snap
index b0cc8249c..154889f6a 100644
--- a/tests/flow/declaration_files_incremental_haste/external/_d3/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declaration_files_incremental_haste/external/_d3/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`min.js 1`] = `
+exports[`min.js-flow 1`] = `
 "class Implementation {}
 module.exports.fun = (): Implementation => new Implementation;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/declaration_files_incremental_haste/foo/bar/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declaration_files_incremental_haste/foo/bar/__snapshots__/jsfmt.spec.js.snap
index f0d02f704..3235825fe 100644
--- a/tests/flow/declaration_files_incremental_haste/foo/bar/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declaration_files_incremental_haste/foo/bar/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`nested_test.js 1`] = `
+exports[`nested_test.js-flow 1`] = `
 "/* @flow */
 
 var docblock = require('qux/docblock');
diff --git a/tests/flow/declaration_files_incremental_haste/ws/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declaration_files_incremental_haste/ws/__snapshots__/jsfmt.spec.js.snap
index 3959b3ee8..42591c271 100644
--- a/tests/flow/declaration_files_incremental_haste/ws/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declaration_files_incremental_haste/ws/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`index.js 1`] = `
+exports[`index.js-flow 1`] = `
 "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 "
 `;
diff --git a/tests/flow/declaration_files_incremental_haste/ws/test/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declaration_files_incremental_haste/ws/test/__snapshots__/jsfmt.spec.js.snap
index 551421890..deb31ecd9 100644
--- a/tests/flow/declaration_files_incremental_haste/ws/test/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declaration_files_incremental_haste/ws/test/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`client.js 1`] = `
+exports[`client.js-flow 1`] = `
 "var ws = require('../');
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 var ws = require(\\"../\\");
diff --git a/tests/flow/declaration_files_incremental_node/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declaration_files_incremental_node/__snapshots__/jsfmt.spec.js.snap
index 6d7ced592..82cbcfabe 100644
--- a/tests/flow/declaration_files_incremental_node/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declaration_files_incremental_node/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "class Implementation {}
 export function foo(): Implementation { return new Implementation; }
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -11,7 +11,7 @@ export function foo(): Implementation {
 "
 `;
 
-exports[`test_absolute.js 1`] = `
+exports[`test_absolute.js-flow 1`] = `
 "/* @flow */
 
 // This will require ./node_modules/B.js.flow
@@ -98,7 +98,7 @@ var F = require(\\"package_with_dir_main\\");
 "
 `;
 
-exports[`test_relative.js 1`] = `
+exports[`test_relative.js-flow 1`] = `
 "import { foo } from './A';
 
 (foo(): boolean); // Error: either Implementation ~> boolean or Definition ~> boolean
diff --git a/tests/flow/declaration_files_node/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declaration_files_node/__snapshots__/jsfmt.spec.js.snap
index 091649c06..fcec1856b 100644
--- a/tests/flow/declaration_files_node/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declaration_files_node/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "/* @flow */
 
 module.exports.fun = (): string => 'hello there!';
@@ -11,7 +11,7 @@ module.exports.fun = (): string => \\"hello there!\\";
 "
 `;
 
-exports[`CJS.js 1`] = `
+exports[`CJS.js-flow 1`] = `
 "// @flow
 module.exports = 42;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -20,7 +20,7 @@ module.exports = 42;
 "
 `;
 
-exports[`test_absolute.js 1`] = `
+exports[`test_absolute.js-flow 1`] = `
 "/* @flow */
 
 // This will require ./node_modules/B.js.flow
@@ -67,7 +67,7 @@ var F = require(\\"package_with_dir_main\\");
 "
 `;
 
-exports[`test_relative.js 1`] = `
+exports[`test_relative.js-flow 1`] = `
 "/* @flow */
 
 // This will require ./A.js.flow
diff --git a/tests/flow/declare_class/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declare_class/__snapshots__/jsfmt.spec.js.snap
index 0093346a6..8a50082bd 100644
--- a/tests/flow/declare_class/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declare_class/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`declare_class.js 1`] = `
+exports[`declare_class.js-flow 1`] = `
 "declare class C {
     static x: number;
     static foo(x: number): void;
diff --git a/tests/flow/declare_class/lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declare_class/lib/__snapshots__/jsfmt.spec.js.snap
index c6d76d684..7f6e644a2 100644
--- a/tests/flow/declare_class/lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declare_class/lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "declare class _C {
   foo(): number;
 }
diff --git a/tests/flow/declare_export/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declare_export/__snapshots__/jsfmt.spec.js.snap
index 0eac17d99..712acd4dd 100644
--- a/tests/flow/declare_export/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declare_export/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "/* @flow */
 
 exports.numberValue = 42;
@@ -11,14 +11,14 @@ exports.numberValue = 42;
 "
 `;
 
-exports[`C.js 1`] = `
+exports[`C.js-flow 1`] = `
 "/* @flow */
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 /* @flow */
 "
 `;
 
-exports[`CommonJS_Clobbering_Class.js 1`] = `
+exports[`CommonJS_Clobbering_Class.js-flow 1`] = `
 "/**
  * @providesModule CommonJS_Clobbering_Class
  * @flow
@@ -75,7 +75,7 @@ module.exports = Test;
 "
 `;
 
-exports[`CommonJS_Clobbering_Lit.js 1`] = `
+exports[`CommonJS_Clobbering_Lit.js-flow 1`] = `
 "/**
  * @providesModule CommonJS_Clobbering_Lit
  * @flow
@@ -104,7 +104,7 @@ module.exports = {
 "
 `;
 
-exports[`CommonJS_Named.js 1`] = `
+exports[`CommonJS_Named.js-flow 1`] = `
 "/**
  * @providesModule CommonJS_Named
  * @flow
@@ -129,7 +129,7 @@ exports.numberValue5 = 5;
 "
 `;
 
-exports[`ES6_Default_AnonFunction1.js 1`] = `
+exports[`ES6_Default_AnonFunction1.js-flow 1`] = `
 "/**
  * @providesModule ES6_Default_AnonFunction1
  * @flow
@@ -146,7 +146,7 @@ declare export default () => number
 "
 `;
 
-exports[`ES6_Default_AnonFunction2.js 1`] = `
+exports[`ES6_Default_AnonFunction2.js-flow 1`] = `
 "/**
  * @providesModule ES6_Default_AnonFunction2
  * @flow
@@ -163,7 +163,7 @@ declare export default () => number
 "
 `;
 
-exports[`ES6_Default_NamedClass1.js 1`] = `
+exports[`ES6_Default_NamedClass1.js-flow 1`] = `
 "/**
  * @providesModule ES6_Default_NamedClass1
  * @flow
@@ -192,7 +192,7 @@ declare export function getAFoo(): FooImpl;
 "
 `;
 
-exports[`ES6_Default_NamedClass2.js 1`] = `
+exports[`ES6_Default_NamedClass2.js-flow 1`] = `
 "/**
  * @providesModule ES6_Default_NamedClass2
  * @flow
@@ -209,7 +209,7 @@ declare export default class Foo { givesANum(): number }
 "
 `;
 
-exports[`ES6_Default_NamedFunction1.js 1`] = `
+exports[`ES6_Default_NamedFunction1.js-flow 1`] = `
 "/**
  * @providesModule ES6_Default_NamedFunction1
  * @flow
@@ -226,7 +226,7 @@ declare export default function foo(): number;
 "
 `;
 
-exports[`ES6_Default_NamedFunction2.js 1`] = `
+exports[`ES6_Default_NamedFunction2.js-flow 1`] = `
 "/**
  * @providesModule ES6_Default_NamedFunction2
  * @flow
@@ -243,7 +243,7 @@ declare export default function foo(): number;
 "
 `;
 
-exports[`ES6_DefaultAndNamed.js 1`] = `
+exports[`ES6_DefaultAndNamed.js-flow 1`] = `
 "/* @flow */
 
 declare export default number;
@@ -256,7 +256,7 @@ declare export var str: string;
 "
 `;
 
-exports[`ES6_ExportAllFrom_Intermediary1.js 1`] = `
+exports[`ES6_ExportAllFrom_Intermediary1.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportAllFrom_Intermediary1
  * @flow
@@ -273,7 +273,7 @@ declare export * from \\"ES6_ExportAllFrom_Source1\\"
 "
 `;
 
-exports[`ES6_ExportAllFrom_Intermediary2.js 1`] = `
+exports[`ES6_ExportAllFrom_Intermediary2.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportAllFrom_Intermediary2
  * @flow
@@ -290,7 +290,7 @@ declare export * from \\"ES6_ExportAllFrom_Source2\\"
 "
 `;
 
-exports[`ES6_ExportAllFrom_Source1.js 1`] = `
+exports[`ES6_ExportAllFrom_Source1.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportAllFrom_Source1
  * @flow
@@ -307,7 +307,7 @@ declare export var numberValue1: number;
 "
 `;
 
-exports[`ES6_ExportAllFrom_Source2.js 1`] = `
+exports[`ES6_ExportAllFrom_Source2.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportAllFrom_Source2
  * @flow
@@ -324,7 +324,7 @@ declare export var numberValue2: number;
 "
 `;
 
-exports[`ES6_ExportAllFromMulti.js 1`] = `
+exports[`ES6_ExportAllFromMulti.js-flow 1`] = `
 "// @flow
 
 declare export * from \\"./ES6_ExportAllFrom_Source1\\";
@@ -337,7 +337,7 @@ declare export * from \\"./ES6_ExportAllFrom_Source2\\"
 "
 `;
 
-exports[`ES6_ExportFrom_Intermediary1.js 1`] = `
+exports[`ES6_ExportFrom_Intermediary1.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportFrom_Intermediary1
  * @flow
@@ -360,7 +360,7 @@ declare export {
 "
 `;
 
-exports[`ES6_ExportFrom_Intermediary2.js 1`] = `
+exports[`ES6_ExportFrom_Intermediary2.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportFrom_Intermediary2
  * @flow
@@ -383,7 +383,7 @@ declare export {
 "
 `;
 
-exports[`ES6_ExportFrom_Source1.js 1`] = `
+exports[`ES6_ExportFrom_Source1.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportFrom_Source1
  * @flow
@@ -402,7 +402,7 @@ declare export var numberValue2: number;
 "
 `;
 
-exports[`ES6_ExportFrom_Source2.js 1`] = `
+exports[`ES6_ExportFrom_Source2.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportFrom_Source2
  * @flow
@@ -421,7 +421,7 @@ declare export var numberValue2: number;
 "
 `;
 
-exports[`ES6_Named1.js 1`] = `
+exports[`ES6_Named1.js-flow 1`] = `
 "/**
  * @providesModule ES6_Named1
  * @flow
@@ -468,7 +468,7 @@ declare export var varDeclNumber2: number;
 "
 `;
 
-exports[`ES6_Named2.js 1`] = `
+exports[`ES6_Named2.js-flow 1`] = `
 "/**
  * @providesModule ES6_Named2
  * @flow
@@ -511,7 +511,7 @@ declare export var varDeclNumber4: number;
 "
 `;
 
-exports[`ProvidesModuleA.js 1`] = `
+exports[`ProvidesModuleA.js-flow 1`] = `
 "/**
  * @providesModule A
  * @flow
@@ -536,7 +536,7 @@ exports.stringValue = \\"str\\";
 "
 `;
 
-exports[`ProvidesModuleCJSDefault.js 1`] = `
+exports[`ProvidesModuleCJSDefault.js-flow 1`] = `
 "/**
  * @providesModule CJSDefault
  * @flow
@@ -557,7 +557,7 @@ module.exports = {
 "
 `;
 
-exports[`ProvidesModuleD.js 1`] = `
+exports[`ProvidesModuleD.js-flow 1`] = `
 "/**
  * @providesModule D
  * @flow
@@ -570,7 +570,7 @@ exports[`ProvidesModuleD.js 1`] = `
 "
 `;
 
-exports[`ProvidesModuleES6Default.js 1`] = `
+exports[`ProvidesModuleES6Default.js-flow 1`] = `
 "/**
  * @providesModule ES6Default
  * @flow
@@ -595,14 +595,14 @@ export default {
 "
 `;
 
-exports[`SideEffects.js 1`] = `
+exports[`SideEffects.js-flow 1`] = `
 "/* @flow */
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 /* @flow */
 "
 `;
 
-exports[`es6modules.js 1`] = `
+exports[`es6modules.js-flow 1`] = `
 "/* @flow */
 
 // ===================== //
diff --git a/tests/flow/declare_fun/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declare_fun/__snapshots__/jsfmt.spec.js.snap
index aca6289e3..2e090f32b 100644
--- a/tests/flow/declare_fun/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declare_fun/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "declare function foo(x: number): string;
 declare function foo(x: string): number;
 declare function foo<X>(x: X): X;
diff --git a/tests/flow/declare_module_exports/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declare_module_exports/__snapshots__/jsfmt.spec.js.snap
index 2d2bdd266..24d21f72d 100644
--- a/tests/flow/declare_module_exports/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declare_module_exports/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`main.js 1`] = `
+exports[`main.js-flow 1`] = `
 "// @flow
 
 import declare_module_exports from \\"declare_module_exports\\";
diff --git a/tests/flow/declare_module_exports/flow-typed/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declare_module_exports/flow-typed/__snapshots__/jsfmt.spec.js.snap
index b10873f2c..1a67fb254 100644
--- a/tests/flow/declare_module_exports/flow-typed/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declare_module_exports/flow-typed/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`libs.js 1`] = `
+exports[`libs.js-flow 1`] = `
 "declare module \\"declare_module_exports\\" {
   declare module.exports: number;
 }
diff --git a/tests/flow/declare_type/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declare_type/__snapshots__/jsfmt.spec.js.snap
index db1fd1fb5..b4d3af700 100644
--- a/tests/flow/declare_type/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declare_type/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`import_declare_type.js 1`] = `
+exports[`import_declare_type.js-flow 1`] = `
 "/**
  * @flow
  */
diff --git a/tests/flow/declare_type/lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/declare_type/lib/__snapshots__/jsfmt.spec.js.snap
index c9893e33f..799b25fed 100644
--- a/tests/flow/declare_type/lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/declare_type/lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`declare_module_type_alias.js 1`] = `
+exports[`declare_module_type_alias.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -29,7 +29,7 @@ declare type Foo = string;
 "
 `;
 
-exports[`declare_type_exports.js 1`] = `
+exports[`declare_type_exports.js-flow 1`] = `
 "/* @flow */
 
 declare module 'foo' {
diff --git a/tests/flow/def_site_variance/__snapshots__/jsfmt.spec.js.snap b/tests/flow/def_site_variance/__snapshots__/jsfmt.spec.js.snap
index 954911aa7..cfdf170c6 100644
--- a/tests/flow/def_site_variance/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/def_site_variance/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "class Variance<+Out,-In> {
   foo(x: Out): Out { return x; }
   bar(y: In): In { return y; }
diff --git a/tests/flow/demo/1/__snapshots__/jsfmt.spec.js.snap b/tests/flow/demo/1/__snapshots__/jsfmt.spec.js.snap
index 1ced68b34..4bf63d117 100644
--- a/tests/flow/demo/1/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/demo/1/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`f.js 1`] = `
+exports[`f.js-flow 1`] = `
 "/* demo */
 
 function f(x) { return 42/x; }
diff --git a/tests/flow/demo/2/__snapshots__/jsfmt.spec.js.snap b/tests/flow/demo/2/__snapshots__/jsfmt.spec.js.snap
index db4f0b420..0a1fcd025 100644
--- a/tests/flow/demo/2/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/demo/2/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "/* @providesModule Demo */
 
 class A {
@@ -49,7 +49,7 @@ module.exports = A;
 "
 `;
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "var A = require('Demo');
 
 var z = new A(\\"42\\").getX();
diff --git a/tests/flow/deps/__snapshots__/jsfmt.spec.js.snap b/tests/flow/deps/__snapshots__/jsfmt.spec.js.snap
index eb15a925a..78269c721 100644
--- a/tests/flow/deps/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/deps/__snapshots__/jsfmt.spec.js.snap
@@ -1,20 +1,20 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "require('./C');
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 require(\\"./C\\");
 "
 `;
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "require('./C');
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 require(\\"./C\\");
 "
 `;
 
-exports[`C.js 1`] = `
+exports[`C.js-flow 1`] = `
 "require('./D');
 require('./E');
 require('./F');
@@ -27,42 +27,42 @@ require(\\"./G\\");
 "
 `;
 
-exports[`D.js 1`] = `
+exports[`D.js-flow 1`] = `
 "require('./I');
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 require(\\"./I\\");
 "
 `;
 
-exports[`E.js 1`] = `
+exports[`E.js-flow 1`] = `
 "require('./I');
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 require(\\"./I\\");
 "
 `;
 
-exports[`F.js 1`] = `
+exports[`F.js-flow 1`] = `
 "// empty
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 // empty
 "
 `;
 
-exports[`G.js 1`] = `
+exports[`G.js-flow 1`] = `
 "require('./H');
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 require(\\"./H\\");
 "
 `;
 
-exports[`H.js 1`] = `
+exports[`H.js-flow 1`] = `
 "// empty
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 // empty
 "
 `;
 
-exports[`I.js 1`] = `
+exports[`I.js-flow 1`] = `
 "require('./A');
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 require(\\"./A\\");
diff --git a/tests/flow/destructuring/__snapshots__/jsfmt.spec.js.snap b/tests/flow/destructuring/__snapshots__/jsfmt.spec.js.snap
index 243d6408a..340f22b5a 100644
--- a/tests/flow/destructuring/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/destructuring/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`array_rest.js 1`] = `
+exports[`array_rest.js-flow 1`] = `
 "let xs = [0, \\"\\", true];
 let [a, ...ys] = xs;
 let [b, ...zs] = ys;
@@ -29,7 +29,7 @@ let [...e] = 0;
 "
 `;
 
-exports[`computed.js 1`] = `
+exports[`computed.js-flow 1`] = `
 "var { [\\"key\\"]: val1 } = { key: \\"val\\" };
 (val1: void); // error: string ~> void
 
@@ -52,7 +52,7 @@ var { [\\"key\\"]: val3, ...spread } = { key: \\"val\\" };
 "
 `;
 
-exports[`defaults.js 1`] = `
+exports[`defaults.js-flow 1`] = `
 "/* @flow */
 
 function obj_prop_fun({p:{q=0}={q:true}}={p:{q:\\"\\"}}) {
@@ -225,7 +225,7 @@ function default_expr_scope({ a, b = a }) {}
 "
 `;
 
-exports[`destructuring.js 1`] = `
+exports[`destructuring.js-flow 1`] = `
 "declare var a:string;
 declare var b:string;
 declare var c:string;
@@ -372,7 +372,7 @@ var cp2_err: string = others.childprop2; // Error: number ~> string
 "
 `;
 
-exports[`destructuring_param.js 1`] = `
+exports[`destructuring_param.js-flow 1`] = `
 "function f(a, { b }) {
   return a + b;
 }
@@ -403,7 +403,7 @@ function f(a, { b }) {
 "
 `;
 
-exports[`eager.js 1`] = `
+exports[`eager.js-flow 1`] = `
 "var x;
 ({x} = null); // error, property \`x\` can not be accessed on \`null\`
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -412,7 +412,7 @@ var x;
 "
 `;
 
-exports[`poly.js 1`] = `
+exports[`poly.js-flow 1`] = `
 "// @flow
 
 function obj_pattern<X>({ prop } : { prop: X }) {} // prop: X
@@ -485,7 +485,7 @@ function arr_rest_pattern<X>([_, ...a]: ArrRest<X>) {
 "
 `;
 
-exports[`rec.js 1`] = `
+exports[`rec.js-flow 1`] = `
 "// @flow
 
 // Make sure that destructuring doesn't cause infinite loops when combined with
@@ -530,7 +530,7 @@ var { x: o } = o;
 "
 `;
 
-exports[`string_lit.js 1`] = `
+exports[`string_lit.js-flow 1`] = `
 "var { \\"key\\": val } = { key: \\"val\\" };
 (val: void); // error: string ~> void
 
@@ -545,7 +545,7 @@ var { \\"with-dash\\": with_dash } = { \\"with-dash\\": \\"motivating example\\"
 "
 `;
 
-exports[`unannotated.js 1`] = `
+exports[`unannotated.js-flow 1`] = `
 "// @flow
 
 var { x } = {
diff --git a/tests/flow/dictionary/__snapshots__/jsfmt.spec.js.snap b/tests/flow/dictionary/__snapshots__/jsfmt.spec.js.snap
index e73ef3f1e..6ea027bf6 100644
--- a/tests/flow/dictionary/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/dictionary/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`any.js 1`] = `
+exports[`any.js-flow 1`] = `
 "/* @flow */
 
 const dict: {[key: string]: number} = {}
@@ -15,7 +15,7 @@ const val: string = dict[k]; // error: number incompatible with string
 "
 `;
 
-exports[`compatible.js 1`] = `
+exports[`compatible.js-flow 1`] = `
 "/* @flow */
 
 function foo0(x: Array<{[key: string]: mixed}>): Array<{[key: string]: mixed}> {
@@ -52,7 +52,7 @@ function foo2(
 "
 `;
 
-exports[`dictionary.js 1`] = `
+exports[`dictionary.js-flow 1`] = `
 "/* Dictionary types are object types that include an indexer, which specifies a
  * key type and a value type. The presence of an indexer makes the object type
  * unsealed, but all added properties must be consistent with the indexer
@@ -652,7 +652,7 @@ function subtype_optional_c_to_dict(x: { p?: C }): { [k: string]: B } {
 "
 `;
 
-exports[`incompatible.js 1`] = `
+exports[`incompatible.js-flow 1`] = `
 "/* @flow */
 
 var x : {[key: string]: string} = {};
@@ -775,7 +775,7 @@ function foo8(x: { [key: string]: number }) {
 "
 `;
 
-exports[`issue-1745.js 1`] = `
+exports[`issue-1745.js-flow 1`] = `
 "/* @flow */
 
 class A {
@@ -830,7 +830,7 @@ class B {
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "type Params = {count: number; [name: string]: string};
 type QueryFunction = (params: Params) => string;
 
@@ -855,7 +855,7 @@ module.exports = o;
 "
 `;
 
-exports[`test_client.js 1`] = `
+exports[`test_client.js-flow 1`] = `
 "var o = require('./test');
 
 o.foo = function (params) {
diff --git a/tests/flow/disjoint-union-perf/__snapshots__/jsfmt.spec.js.snap b/tests/flow/disjoint-union-perf/__snapshots__/jsfmt.spec.js.snap
index 845c76bfb..43847dcc0 100644
--- a/tests/flow/disjoint-union-perf/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/disjoint-union-perf/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`ast.js 1`] = `
+exports[`ast.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -163,7 +163,7 @@ export type TypedNode =
 "
 `;
 
-exports[`emit.js 1`] = `
+exports[`emit.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -296,7 +296,7 @@ export function emitExpression(node: TypedNode): t.Expression {
 "
 `;
 
-exports[`jsAst.js 1`] = `
+exports[`jsAst.js-flow 1`] = `
 "/**
  * @flow
  */
diff --git a/tests/flow/docblock_flow/__snapshots__/jsfmt.spec.js.snap b/tests/flow/docblock_flow/__snapshots__/jsfmt.spec.js.snap
index c8eff340b..dd06d6d59 100644
--- a/tests/flow/docblock_flow/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/docblock_flow/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`license_with_flow.js 1`] = `
+exports[`license_with_flow.js-flow 1`] = `
 "/* Copyright example */
 /* @flow */
 
@@ -13,7 +13,7 @@ exports[`license_with_flow.js 1`] = `
 "
 `;
 
-exports[`max_header_tokens.js 1`] = `
+exports[`max_header_tokens.js-flow 1`] = `
 "/* @flow */
 /* second token */
 /* third token */
@@ -34,7 +34,7 @@ exports[`max_header_tokens.js 1`] = `
 "
 `;
 
-exports[`multiple_flows_1.js 1`] = `
+exports[`multiple_flows_1.js-flow 1`] = `
 "/* @flow */
 /* @flow */
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -43,7 +43,7 @@ exports[`multiple_flows_1.js 1`] = `
 "
 `;
 
-exports[`multiple_flows_2.js 1`] = `
+exports[`multiple_flows_2.js-flow 1`] = `
 "/**
  * @flow
  * @noflow
@@ -56,7 +56,7 @@ exports[`multiple_flows_2.js 1`] = `
 "
 `;
 
-exports[`multiple_providesModule_1.js 1`] = `
+exports[`multiple_providesModule_1.js-flow 1`] = `
 "/**
  * @providesModule Foo
  * @providesModule Bar
@@ -71,7 +71,7 @@ exports[`multiple_providesModule_1.js 1`] = `
 "
 `;
 
-exports[`multiple_providesModule_2.js 1`] = `
+exports[`multiple_providesModule_2.js-flow 1`] = `
 "/**
  * @providesModule Foo
  * @flow
@@ -90,7 +90,7 @@ exports[`multiple_providesModule_2.js 1`] = `
 "
 `;
 
-exports[`use_strict_with_flow.js 1`] = `
+exports[`use_strict_with_flow.js-flow 1`] = `
 "\\"use strict\\";
 /* @flow */
 
@@ -103,7 +103,7 @@ exports[`use_strict_with_flow.js 1`] = `
 "
 `;
 
-exports[`with_flow.js 1`] = `
+exports[`with_flow.js-flow 1`] = `
 "/* @flow */
 
 (\\"\\": void); // error
@@ -114,7 +114,7 @@ exports[`with_flow.js 1`] = `
 "
 `;
 
-exports[`without_flow.js 1`] = `
+exports[`without_flow.js-flow 1`] = `
 "/* some other comment */
 
 (\\"\\": void); // no error
diff --git a/tests/flow/dom/__snapshots__/jsfmt.spec.js.snap b/tests/flow/dom/__snapshots__/jsfmt.spec.js.snap
index 8376fc12f..aee09db09 100644
--- a/tests/flow/dom/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/dom/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`CanvasRenderingContext2D.js 1`] = `
+exports[`CanvasRenderingContext2D.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -31,7 +31,7 @@ let tests = [
 "
 `;
 
-exports[`CustomEvent.js 1`] = `
+exports[`CustomEvent.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -54,7 +54,7 @@ let tests = [
 "
 `;
 
-exports[`Document.js 1`] = `
+exports[`Document.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -81,7 +81,7 @@ let tests = [
 "
 `;
 
-exports[`Element.js 1`] = `
+exports[`Element.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -122,7 +122,7 @@ let tests = [
 "
 `;
 
-exports[`HTMLCanvasElement.js 1`] = `
+exports[`HTMLCanvasElement.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -143,7 +143,7 @@ let tests = [
 "
 `;
 
-exports[`HTMLElement.js 1`] = `
+exports[`HTMLElement.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -184,7 +184,7 @@ let tests = [
 "
 `;
 
-exports[`HTMLInputElement.js 1`] = `
+exports[`HTMLInputElement.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -213,7 +213,7 @@ let tests = [
 "
 `;
 
-exports[`URL.js 1`] = `
+exports[`URL.js-flow 1`] = `
 "/* @flow */
 
 const a = new URL('http://flowtype.org/'); // correct
@@ -258,7 +258,7 @@ const r: string = c.username; // correct
 "
 `;
 
-exports[`eventtarget.js 1`] = `
+exports[`eventtarget.js-flow 1`] = `
 "// @flow
 
 let listener: EventListener = function (event: Event) :void {};
@@ -313,7 +313,7 @@ let tests = [
 "
 `;
 
-exports[`path2d.js 1`] = `
+exports[`path2d.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -340,7 +340,7 @@ let tests = [
 "
 `;
 
-exports[`registerElement.js 1`] = `
+exports[`registerElement.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -460,7 +460,7 @@ let tests = [
 "
 `;
 
-exports[`traversal.js 1`] = `
+exports[`traversal.js-flow 1`] = `
 "// @flow
 
 let tests = [
diff --git a/tests/flow/dump-types/__snapshots__/jsfmt.spec.js.snap b/tests/flow/dump-types/__snapshots__/jsfmt.spec.js.snap
index 5b3ab1fe6..7df644610 100644
--- a/tests/flow/dump-types/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/dump-types/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`import.js 1`] = `
+exports[`import.js-flow 1`] = `
 "// @flow
 var num = 42;
 function bar() { }
@@ -15,7 +15,7 @@ module.exports = num;
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "// @flow
 var num = require('./import');
 function foo(x) { }
diff --git a/tests/flow/duplicate_methods/__snapshots__/jsfmt.spec.js.snap b/tests/flow/duplicate_methods/__snapshots__/jsfmt.spec.js.snap
index 9d10f5e3e..9d68311dc 100644
--- a/tests/flow/duplicate_methods/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/duplicate_methods/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "class C1 {
   m() { }
   m() { }
diff --git a/tests/flow/encaps/__snapshots__/jsfmt.spec.js.snap b/tests/flow/encaps/__snapshots__/jsfmt.spec.js.snap
index 70121e3e6..637feff3c 100644
--- a/tests/flow/encaps/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/encaps/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`encaps.js 1`] = `
+exports[`encaps.js-flow 1`] = `
 "class A { }
 var a = new A();
 var s1 = \`l\${a.x}r\`; // error: no prop x in A
diff --git a/tests/flow/enumerror/__snapshots__/jsfmt.spec.js.snap b/tests/flow/enumerror/__snapshots__/jsfmt.spec.js.snap
index 31ad91ff3..37ab5afed 100644
--- a/tests/flow/enumerror/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/enumerror/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`enumerror.js 1`] = `
+exports[`enumerror.js-flow 1`] = `
 "/** @flow */
 
 function isActive(ad: {state: $Keys<{
diff --git a/tests/flow/equals/__snapshots__/jsfmt.spec.js.snap b/tests/flow/equals/__snapshots__/jsfmt.spec.js.snap
index b792f8646..e938785d0 100644
--- a/tests/flow/equals/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/equals/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`equals.js 1`] = `
+exports[`equals.js-flow 1`] = `
 "/* @flow */
 
 (1 == 1);
diff --git a/tests/flow/error_messages/__snapshots__/jsfmt.spec.js.snap b/tests/flow/error_messages/__snapshots__/jsfmt.spec.js.snap
index e542499ac..36db7b59d 100644
--- a/tests/flow/error_messages/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/error_messages/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`errors.js 1`] = `
+exports[`errors.js-flow 1`] = `
 "if (typeof define === 'function' && define.amd) { }
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 if (typeof define === \\"function\\" && define.amd) {
diff --git a/tests/flow/es6modules/__snapshots__/jsfmt.spec.js.snap b/tests/flow/es6modules/__snapshots__/jsfmt.spec.js.snap
index 867bc7c31..78f6a6c1e 100644
--- a/tests/flow/es6modules/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/es6modules/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "/* @flow */
 
 exports.numberValue = 42;
@@ -11,14 +11,14 @@ exports.numberValue = 42;
 "
 `;
 
-exports[`C.js 1`] = `
+exports[`C.js-flow 1`] = `
 "/* @flow */
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 /* @flow */
 "
 `;
 
-exports[`CommonJS_Clobbering_Class.js 1`] = `
+exports[`CommonJS_Clobbering_Class.js-flow 1`] = `
 "/**
  * @providesModule CommonJS_Clobbering_Class
  * @flow
@@ -75,7 +75,7 @@ module.exports = Test;
 "
 `;
 
-exports[`CommonJS_Clobbering_Frozen.js 1`] = `
+exports[`CommonJS_Clobbering_Frozen.js-flow 1`] = `
 "/**
  * @providesModule CommonJS_Clobbering_Frozen
  * @flow
@@ -96,7 +96,7 @@ module.exports = Object.freeze({
 "
 `;
 
-exports[`CommonJS_Clobbering_Lit.js 1`] = `
+exports[`CommonJS_Clobbering_Lit.js-flow 1`] = `
 "/**
  * @providesModule CommonJS_Clobbering_Lit
  * @flow
@@ -125,7 +125,7 @@ module.exports = {
 "
 `;
 
-exports[`CommonJS_Named.js 1`] = `
+exports[`CommonJS_Named.js-flow 1`] = `
 "/**
  * @providesModule CommonJS_Named
  * @flow
@@ -150,7 +150,7 @@ exports.numberValue5 = 5;
 "
 `;
 
-exports[`ES6_Default_AnonClass1.js 1`] = `
+exports[`ES6_Default_AnonClass1.js-flow 1`] = `
 "/**
  * @providesModule ES6_Default_AnonClass1
  * @flow
@@ -171,7 +171,7 @@ export default class {
 "
 `;
 
-exports[`ES6_Default_AnonClass2.js 1`] = `
+exports[`ES6_Default_AnonClass2.js-flow 1`] = `
 "/**
  * @providesModule ES6_Default_AnonClass2
  * @flow
@@ -192,7 +192,7 @@ export default class {
 "
 `;
 
-exports[`ES6_Default_AnonFunction1.js 1`] = `
+exports[`ES6_Default_AnonFunction1.js-flow 1`] = `
 "/**
  * @providesModule ES6_Default_AnonFunction1
  * @flow
@@ -211,7 +211,7 @@ export default function(): number {
 "
 `;
 
-exports[`ES6_Default_AnonFunction2.js 1`] = `
+exports[`ES6_Default_AnonFunction2.js-flow 1`] = `
 "/**
  * @providesModule ES6_Default_AnonFunction2
  * @flow
@@ -230,7 +230,7 @@ export default function(): number {
 "
 `;
 
-exports[`ES6_Default_NamedClass1.js 1`] = `
+exports[`ES6_Default_NamedClass1.js-flow 1`] = `
 "/**
  * @providesModule ES6_Default_NamedClass1
  * @flow
@@ -261,7 +261,7 @@ new Foo();
 "
 `;
 
-exports[`ES6_Default_NamedClass2.js 1`] = `
+exports[`ES6_Default_NamedClass2.js-flow 1`] = `
 "/**
  * @providesModule ES6_Default_NamedClass2
  * @flow
@@ -282,7 +282,7 @@ export default class Foo {
 "
 `;
 
-exports[`ES6_Default_NamedFunction1.js 1`] = `
+exports[`ES6_Default_NamedFunction1.js-flow 1`] = `
 "/**
  * @providesModule ES6_Default_NamedFunction1
  * @flow
@@ -301,7 +301,7 @@ export default function foo(): number {
 "
 `;
 
-exports[`ES6_Default_NamedFunction2.js 1`] = `
+exports[`ES6_Default_NamedFunction2.js-flow 1`] = `
 "/**
  * @providesModule ES6_Default_NamedFunction2
  * @flow
@@ -320,7 +320,7 @@ export default function foo(): number {
 "
 `;
 
-exports[`ES6_DefaultAndNamed.js 1`] = `
+exports[`ES6_DefaultAndNamed.js-flow 1`] = `
 "/* @flow */
 
 export default 42;
@@ -333,7 +333,7 @@ export var str = \\"asdf\\";
 "
 `;
 
-exports[`ES6_ExportAllFrom_Intermediary1.js 1`] = `
+exports[`ES6_ExportAllFrom_Intermediary1.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportAllFrom_Intermediary1
  * @flow
@@ -350,7 +350,7 @@ export * from \\"ES6_ExportAllFrom_Source1\\";
 "
 `;
 
-exports[`ES6_ExportAllFrom_Intermediary2.js 1`] = `
+exports[`ES6_ExportAllFrom_Intermediary2.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportAllFrom_Intermediary2
  * @flow
@@ -367,7 +367,7 @@ export * from \\"ES6_ExportAllFrom_Source2\\";
 "
 `;
 
-exports[`ES6_ExportAllFrom_Source1.js 1`] = `
+exports[`ES6_ExportAllFrom_Source1.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportAllFrom_Source1
  * @flow
@@ -384,7 +384,7 @@ export var numberValue1 = 1;
 "
 `;
 
-exports[`ES6_ExportAllFrom_Source2.js 1`] = `
+exports[`ES6_ExportAllFrom_Source2.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportAllFrom_Source2
  * @flow
@@ -401,7 +401,7 @@ export var numberValue2 = 1;
 "
 `;
 
-exports[`ES6_ExportAllFromMulti.js 1`] = `
+exports[`ES6_ExportAllFromMulti.js-flow 1`] = `
 "// @flow
 
 export * from \\"./ES6_ExportAllFrom_Source1\\";
@@ -414,7 +414,7 @@ export * from \\"./ES6_ExportAllFrom_Source2\\";
 "
 `;
 
-exports[`ES6_ExportFrom_Intermediary1.js 1`] = `
+exports[`ES6_ExportFrom_Intermediary1.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportFrom_Intermediary1
  * @flow
@@ -437,7 +437,7 @@ export {
 "
 `;
 
-exports[`ES6_ExportFrom_Intermediary2.js 1`] = `
+exports[`ES6_ExportFrom_Intermediary2.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportFrom_Intermediary2
  * @flow
@@ -460,7 +460,7 @@ export {
 "
 `;
 
-exports[`ES6_ExportFrom_Source1.js 1`] = `
+exports[`ES6_ExportFrom_Source1.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportFrom_Source1
  * @flow
@@ -477,7 +477,7 @@ export var numberValue1 = 1, numberValue2 = 2;
 "
 `;
 
-exports[`ES6_ExportFrom_Source2.js 1`] = `
+exports[`ES6_ExportFrom_Source2.js-flow 1`] = `
 "/**
  * @providesModule ES6_ExportFrom_Source2
  * @flow
@@ -494,7 +494,7 @@ export var numberValue1 = 1, numberValue2 = 2;
 "
 `;
 
-exports[`ES6_Named1.js 1`] = `
+exports[`ES6_Named1.js-flow 1`] = `
 "/**
  * @providesModule ES6_Named1
  * @flow
@@ -549,7 +549,7 @@ export var [destructuredArrNumber] = [1];
 "
 `;
 
-exports[`ES6_Named2.js 1`] = `
+exports[`ES6_Named2.js-flow 1`] = `
 "/**
  * @providesModule ES6_Named2
  * @flow
@@ -600,7 +600,7 @@ export var [destructuredArrNumber2] = [1];
 "
 `;
 
-exports[`ExportType.js 1`] = `
+exports[`ExportType.js-flow 1`] = `
 "// @flow
 
 export type typeAlias = number;
@@ -611,7 +611,7 @@ export type typeAlias = number;
 "
 `;
 
-exports[`ProvidesModuleA.js 1`] = `
+exports[`ProvidesModuleA.js-flow 1`] = `
 "/**
  * @providesModule A
  * @flow
@@ -636,7 +636,7 @@ exports.stringValue = \\"str\\";
 "
 `;
 
-exports[`ProvidesModuleCJSDefault.js 1`] = `
+exports[`ProvidesModuleCJSDefault.js-flow 1`] = `
 "/**
  * @providesModule CJSDefault
  * @flow
@@ -657,7 +657,7 @@ module.exports = {
 "
 `;
 
-exports[`ProvidesModuleD.js 1`] = `
+exports[`ProvidesModuleD.js-flow 1`] = `
 "/**
  * @providesModule D
  * @flow
@@ -670,7 +670,7 @@ exports[`ProvidesModuleD.js 1`] = `
 "
 `;
 
-exports[`ProvidesModuleES6Default.js 1`] = `
+exports[`ProvidesModuleES6Default.js-flow 1`] = `
 "/**
  * @providesModule ES6Default
  * @flow
@@ -695,14 +695,14 @@ export default {
 "
 `;
 
-exports[`SideEffects.js 1`] = `
+exports[`SideEffects.js-flow 1`] = `
 "/* @flow */
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 /* @flow */
 "
 `;
 
-exports[`es6modules.js 1`] = `
+exports[`es6modules.js-flow 1`] = `
 "/* @flow */
 
 // ===================== //
@@ -1299,7 +1299,7 @@ import { typeAlias } from \\"./ExportType\\"; // Error: Cannot vanilla-import a
 "
 `;
 
-exports[`test_imports_are_frozen.js 1`] = `
+exports[`test_imports_are_frozen.js-flow 1`] = `
 "/* @flow */
 
 //
diff --git a/tests/flow/es_declare_module/__snapshots__/jsfmt.spec.js.snap b/tests/flow/es_declare_module/__snapshots__/jsfmt.spec.js.snap
index 99e787605..0e861c721 100644
--- a/tests/flow/es_declare_module/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/es_declare_module/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`es_declare_module.js 1`] = `
+exports[`es_declare_module.js-flow 1`] = `
 "// @flow
 
 import {num1, str1} from \\"CJS_Named\\";
diff --git a/tests/flow/es_declare_module/flow-typed/__snapshots__/jsfmt.spec.js.snap b/tests/flow/es_declare_module/flow-typed/__snapshots__/jsfmt.spec.js.snap
index 956a0dc95..82fce7d14 100644
--- a/tests/flow/es_declare_module/flow-typed/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/es_declare_module/flow-typed/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`declares.js 1`] = `
+exports[`declares.js-flow 1`] = `
 "declare module \\"CJS_Named\\" {
   declare var num1: number;
   declare var str1: string;
diff --git a/tests/flow/esproposal_export_star_as.enable/__snapshots__/jsfmt.spec.js.snap b/tests/flow/esproposal_export_star_as.enable/__snapshots__/jsfmt.spec.js.snap
index e600eff14..c835e518d 100644
--- a/tests/flow/esproposal_export_star_as.enable/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/esproposal_export_star_as.enable/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`dest.js 1`] = `
+exports[`dest.js-flow 1`] = `
 "// @flow
 
 import {source} from \\"./test\\";
@@ -23,7 +23,7 @@ var d: number = source.str; // Error: num ~> string
 "
 `;
 
-exports[`source.js 1`] = `
+exports[`source.js-flow 1`] = `
 "// @flow
 
 export var str = 'asdf';
diff --git a/tests/flow/esproposal_export_star_as.ignore/__snapshots__/jsfmt.spec.js.snap b/tests/flow/esproposal_export_star_as.ignore/__snapshots__/jsfmt.spec.js.snap
index 4c408ba98..5e14fafc2 100644
--- a/tests/flow/esproposal_export_star_as.ignore/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/esproposal_export_star_as.ignore/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`dest.js 1`] = `
+exports[`dest.js-flow 1`] = `
 "// @flow
 
 import {source} from \\"./test\\";
@@ -23,7 +23,7 @@ var d: number = source.str; // Ignored error: num ~> string
 "
 `;
 
-exports[`source.js 1`] = `
+exports[`source.js-flow 1`] = `
 "// @flow
 
 export var str = 'asdf';
diff --git a/tests/flow/export_default/__snapshots__/jsfmt.spec.js.snap b/tests/flow/export_default/__snapshots__/jsfmt.spec.js.snap
index 37a848cf5..126b98eab 100644
--- a/tests/flow/export_default/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/export_default/__snapshots__/jsfmt.spec.js.snap
@@ -1,13 +1,13 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`P.js 1`] = `
+exports[`P.js-flow 1`] = `
 "module.exports = require('M');
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 module.exports = require(\\"M\\");
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "var M = require('M');
 var N = require('N');
 N.x = M(N.x);
diff --git a/tests/flow/export_default/lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/export_default/lib/__snapshots__/jsfmt.spec.js.snap
index dca6b58f3..42c98b7d0 100644
--- a/tests/flow/export_default/lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/export_default/lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`lib.js 1`] = `
+exports[`lib.js-flow 1`] = `
 "declare module M {
     declare function exports(x:string): string;
 }
diff --git a/tests/flow/export_type/__snapshots__/jsfmt.spec.js.snap b/tests/flow/export_type/__snapshots__/jsfmt.spec.js.snap
index 83f6f2094..97c6d733d 100644
--- a/tests/flow/export_type/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/export_type/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`cjs_with_types.js 1`] = `
+exports[`cjs_with_types.js-flow 1`] = `
 "/* @flow */
 
 export type talias4 = number;
@@ -17,7 +17,7 @@ module.exports = {};
 "
 `;
 
-exports[`importer.js 1`] = `
+exports[`importer.js-flow 1`] = `
 "/* @flow */
 
 import type {
@@ -86,7 +86,7 @@ var n: IFoo2 = { prop: 42 }; // Error: {prop:number} ~> {prop:string}
 "
 `;
 
-exports[`types_only.js 1`] = `
+exports[`types_only.js-flow 1`] = `
 "/* @flow */
 
 export type inlinedType1 = number;
@@ -121,7 +121,7 @@ export interface IFoo { prop: number }
 "
 `;
 
-exports[`types_only2.js 1`] = `
+exports[`types_only2.js-flow 1`] = `
 "/* @flow */
 
 export type talias1 = number;
diff --git a/tests/flow/extensions/__snapshots__/jsfmt.spec.js.snap b/tests/flow/extensions/__snapshots__/jsfmt.spec.js.snap
index 4067aab70..c5b07745f 100644
--- a/tests/flow/extensions/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/extensions/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "var imp = require('./bar');
 imp(1337);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/facebook_fbt_none/__snapshots__/jsfmt.spec.js.snap b/tests/flow/facebook_fbt_none/__snapshots__/jsfmt.spec.js.snap
index ad5b6a5fa..a8c6a3693 100644
--- a/tests/flow/facebook_fbt_none/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/facebook_fbt_none/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`main.js 1`] = `
+exports[`main.js-flow 1`] = `
 "// @flow
 var React = require('react');
 (<fbt />: React.Element<*>);
diff --git a/tests/flow/facebook_fbt_some/__snapshots__/jsfmt.spec.js.snap b/tests/flow/facebook_fbt_some/__snapshots__/jsfmt.spec.js.snap
index 69430b2de..4fab1dd94 100644
--- a/tests/flow/facebook_fbt_some/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/facebook_fbt_some/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`main.js 1`] = `
+exports[`main.js-flow 1`] = `
 "// @flow
 
 (<fbt />: number);
diff --git a/tests/flow/facebook_fbt_some/flow-typed/__snapshots__/jsfmt.spec.js.snap b/tests/flow/facebook_fbt_some/flow-typed/__snapshots__/jsfmt.spec.js.snap
index d035b074a..4041fb7e8 100644
--- a/tests/flow/facebook_fbt_some/flow-typed/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/facebook_fbt_some/flow-typed/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`fbt.js 1`] = `
+exports[`fbt.js-flow 1`] = `
 "type Fbt = number
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 type Fbt = number;
diff --git a/tests/flow/facebookisms/__snapshots__/jsfmt.spec.js.snap b/tests/flow/facebookisms/__snapshots__/jsfmt.spec.js.snap
index e85d29006..ac00cda8a 100644
--- a/tests/flow/facebookisms/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/facebookisms/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Bar.js 1`] = `
+exports[`Bar.js-flow 1`] = `
 "var Bar = { x: 0 };
 module.exports = Bar;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -9,7 +9,7 @@ module.exports = Bar;
 "
 `;
 
-exports[`copyProperties.js 1`] = `
+exports[`copyProperties.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -92,7 +92,7 @@ let tests = [
 "
 `;
 
-exports[`invariant.js 1`] = `
+exports[`invariant.js-flow 1`] = `
 "/* @flow */
 
 let tests = [
@@ -125,7 +125,7 @@ let tests = [
 "
 `;
 
-exports[`lib.js 1`] = `
+exports[`lib.js-flow 1`] = `
 "declare module \\"copyProperties\\" {
   declare var exports: Object$Assign;
 }
@@ -150,7 +150,7 @@ declare module \\"mixin\\" {
 "
 `;
 
-exports[`mergeInto.js 1`] = `
+exports[`mergeInto.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -223,7 +223,7 @@ let tests = [
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "var Bar = require('./Bar');
 var mixin = require('mixin');
 
diff --git a/tests/flow/fetch/__snapshots__/jsfmt.spec.js.snap b/tests/flow/fetch/__snapshots__/jsfmt.spec.js.snap
index 5b90de60a..504f8f400 100644
--- a/tests/flow/fetch/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/fetch/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`fetch.js 1`] = `
+exports[`fetch.js-flow 1`] = `
 "/* @flow */
 
 // most of the details are tested in the separate file
@@ -53,7 +53,7 @@ const d: Promise<Blob> = fetch(\\"image.png\\"); // incorrect
 "
 `;
 
-exports[`headers.js 1`] = `
+exports[`headers.js-flow 1`] = `
 "/* @flow */
 
 const a = new Headers(\\"'Content-Type': 'image/jpeg'\\"); // not correct
@@ -114,7 +114,7 @@ e.getAll(\\"content-type\\").forEach((v: string) => {}); // correct
 "
 `;
 
-exports[`request.js 1`] = `
+exports[`request.js-flow 1`] = `
 "/* @flow */
 const a: Request = new Request(); // incorrect
 const b: Request = new Request('http://example.org'); // correct
@@ -221,7 +221,7 @@ h.arrayBuffer().then((ab: Buffer) => ab); // incorrect
 "
 `;
 
-exports[`response.js 1`] = `
+exports[`response.js-flow 1`] = `
 "/* @flow */
 const a: Response = new Response(); // correct
 const b: Response = new Response(new Blob()); // correct
@@ -318,7 +318,7 @@ h.arrayBuffer().then((ab: Buffer) => ab); // incorrect
 "
 `;
 
-exports[`urlsearchparams.js 1`] = `
+exports[`urlsearchparams.js-flow 1`] = `
 "/* @flow */
 
 const a = new URLSearchParams(\\"key1=value1\\"); // correct
diff --git a/tests/flow/find-module/__snapshots__/jsfmt.spec.js.snap b/tests/flow/find-module/__snapshots__/jsfmt.spec.js.snap
index 787a75633..2d5909fac 100644
--- a/tests/flow/find-module/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/find-module/__snapshots__/jsfmt.spec.js.snap
@@ -1,13 +1,13 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`req.js 1`] = `
+exports[`req.js-flow 1`] = `
 "module.exports = 0;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 module.exports = 0;
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "var x = require('./req');
 (x: string);
 
diff --git a/tests/flow/fixpoint/__snapshots__/jsfmt.spec.js.snap b/tests/flow/fixpoint/__snapshots__/jsfmt.spec.js.snap
index 24322eb00..af7dc2cce 100644
--- a/tests/flow/fixpoint/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/fixpoint/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Fun.js 1`] = `
+exports[`Fun.js-flow 1`] = `
 "
 /* @providesModule Fun */
 
@@ -72,7 +72,7 @@ module.exports = { fn: fix };
 "
 `;
 
-exports[`Ycombinator.js 1`] = `
+exports[`Ycombinator.js-flow 1`] = `
 "
 /* @providesModule Ycombinator */
 
diff --git a/tests/flow/flow_ast.template_strings/__snapshots__/jsfmt.spec.js.snap b/tests/flow/flow_ast.template_strings/__snapshots__/jsfmt.spec.js.snap
index 1800433a0..e72f825d4 100644
--- a/tests/flow/flow_ast.template_strings/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/flow_ast.template_strings/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "a\`foo \${bar} baz\`
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 a\`foo \${bar} baz\`;
diff --git a/tests/flow/for/__snapshots__/jsfmt.spec.js.snap b/tests/flow/for/__snapshots__/jsfmt.spec.js.snap
index aeffc471a..8b2b5e0d7 100644
--- a/tests/flow/for/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/for/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`abnormal.js 1`] = `
+exports[`abnormal.js-flow 1`] = `
 "/* @flow */
 
 function foo(x: boolean) {
@@ -99,7 +99,7 @@ function corge(x: boolean) {
 "
 `;
 
-exports[`abnormal_for_in.js 1`] = `
+exports[`abnormal_for_in.js-flow 1`] = `
 "function foo(x: boolean) {
   var obj = { a: 1, b: 2};
   for (var prop in obj) {
@@ -188,7 +188,7 @@ function corge(x: boolean) {
 "
 `;
 
-exports[`abnormal_for_of.js 1`] = `
+exports[`abnormal_for_of.js-flow 1`] = `
 "function foo(x: boolean) {
   var arr = [1, 2, 3];
   for (var elem of arr) {
diff --git a/tests/flow/forof/__snapshots__/jsfmt.spec.js.snap b/tests/flow/forof/__snapshots__/jsfmt.spec.js.snap
index 3bfba67c6..c4a6aad5b 100644
--- a/tests/flow/forof/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/forof/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`forof.js 1`] = `
+exports[`forof.js-flow 1`] = `
 "/**
  * @flow
  */
diff --git a/tests/flow/function/__snapshots__/jsfmt.spec.js.snap b/tests/flow/function/__snapshots__/jsfmt.spec.js.snap
index 89d3175a2..922c11931 100644
--- a/tests/flow/function/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/function/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`apply.js 1`] = `
+exports[`apply.js-flow 1`] = `
 "function test(a: string, b: number): number {
   return this.length; // expect []/\\"\\" this
 }
@@ -93,7 +93,7 @@ function test2(): number {
 "
 `;
 
-exports[`bind.js 1`] = `
+exports[`bind.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -116,7 +116,7 @@ let tests = [
 "
 `;
 
-exports[`call.js 1`] = `
+exports[`call.js-flow 1`] = `
 "// @flow
 
 function test(a: string, b: number): number {
@@ -195,7 +195,7 @@ function test2(): number {
 "
 `;
 
-exports[`function.js 1`] = `
+exports[`function.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -334,7 +334,7 @@ var e = (d.bind(1): Function)();
 "
 `;
 
-exports[`rest.js 1`] = `
+exports[`rest.js-flow 1`] = `
 "/* regression tests */
 
 function rest_array<T>(...xs: Array<T>): T {
diff --git a/tests/flow/funrec/__snapshots__/jsfmt.spec.js.snap b/tests/flow/funrec/__snapshots__/jsfmt.spec.js.snap
index 7838f34c7..1fccbc774 100644
--- a/tests/flow/funrec/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/funrec/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`funrec.js 1`] = `
+exports[`funrec.js-flow 1`] = `
 "function bar(x) { return x; }
 function foo() {
     return function bound() {
diff --git a/tests/flow/generators/__snapshots__/jsfmt.spec.js.snap b/tests/flow/generators/__snapshots__/jsfmt.spec.js.snap
index 9c4322026..b25751484 100644
--- a/tests/flow/generators/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/generators/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`class.js 1`] = `
+exports[`class.js-flow 1`] = `
 "class GeneratorExamples {
   *stmt_yield(): Generator<number, void, void> {
     yield 0; // ok
@@ -265,7 +265,7 @@ for (var x of examples.delegate_yield_iterable([])) {
 "
 `;
 
-exports[`class_failure.js 1`] = `
+exports[`class_failure.js-flow 1`] = `
 "// generalization of failure in class.js
 
 class GeneratorExamples<X> {
@@ -312,7 +312,7 @@ if (typeof infer_stmt_next === \\"undefined\\") {
 "
 `;
 
-exports[`generators.js 1`] = `
+exports[`generators.js-flow 1`] = `
 "function *stmt_yield(): Generator<number, void, void> {
   yield 0; // ok
   yield \\"\\"; // error: string ~> number
@@ -577,7 +577,7 @@ if (multiple_return_result.done) {
 "
 `;
 
-exports[`return.js 1`] = `
+exports[`return.js-flow 1`] = `
 "function test1(gen: Generator<void, string, void>) {
   // You can pass whatever you like to return, it doesn't need to be related to
   // the Generator's return type
@@ -624,7 +624,7 @@ if (refuse_return_result.done) {
 "
 `;
 
-exports[`throw.js 1`] = `
+exports[`throw.js-flow 1`] = `
 "function *catch_return() {
   try {
     yield 0;
@@ -679,7 +679,7 @@ if (yield_return_value !== undefined) {
 "
 `;
 
-exports[`variance.js 1`] = `
+exports[`variance.js-flow 1`] = `
 "declare var g1: Generator<string, string, ?string>;
 var g2: Generator<?string, ?string, string> = g1;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/generics/__snapshots__/jsfmt.spec.js.snap b/tests/flow/generics/__snapshots__/jsfmt.spec.js.snap
index 150136486..fdc35ebc8 100644
--- a/tests/flow/generics/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/generics/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`generics.js 1`] = `
+exports[`generics.js-flow 1`] = `
 "class C<X> {
   x:X;
   constructor(x:X) { this.x = x; }
diff --git a/tests/flow/geolocation/__snapshots__/jsfmt.spec.js.snap b/tests/flow/geolocation/__snapshots__/jsfmt.spec.js.snap
index 9d5354838..0e1ca7e31 100644
--- a/tests/flow/geolocation/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/geolocation/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`a.js 1`] = `
+exports[`a.js-flow 1`] = `
 "/* @flow */
 
 var geolocation = new Geolocation();
diff --git a/tests/flow/get-def/__snapshots__/jsfmt.spec.js.snap b/tests/flow/get-def/__snapshots__/jsfmt.spec.js.snap
index dd91c8110..d532ec2ba 100644
--- a/tests/flow/get-def/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/get-def/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`example.js 1`] = `
+exports[`example.js-flow 1`] = `
 "/* @flow */
 
 var lib = require('./library');
@@ -35,7 +35,7 @@ lib.bar();
 "
 `;
 
-exports[`imports.js 1`] = `
+exports[`imports.js-flow 1`] = `
 "// @flow
 
 import thing from \\"./helpers/exports_default.js\\";
@@ -62,7 +62,7 @@ things;
 "
 `;
 
-exports[`library.js 1`] = `
+exports[`library.js-flow 1`] = `
 "/* @flow */
 
 module.exports = {
diff --git a/tests/flow/get-def/helpers/__snapshots__/jsfmt.spec.js.snap b/tests/flow/get-def/helpers/__snapshots__/jsfmt.spec.js.snap
index 569ef7c49..8e65cd98d 100644
--- a/tests/flow/get-def/helpers/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/get-def/helpers/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`exports_default.js 1`] = `
+exports[`exports_default.js-flow 1`] = `
 "// @flow
 
 const x = \\"foo\\";
@@ -15,7 +15,7 @@ export default x;
 "
 `;
 
-exports[`exports_named.js 1`] = `
+exports[`exports_named.js-flow 1`] = `
 "// @flow
 
 export const foo = \\"foo\\";
diff --git a/tests/flow/get-def2/__snapshots__/jsfmt.spec.js.snap b/tests/flow/get-def2/__snapshots__/jsfmt.spec.js.snap
index ac43726ae..b04c22ec5 100644
--- a/tests/flow/get-def2/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/get-def2/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Parent.js 1`] = `
+exports[`Parent.js-flow 1`] = `
 "// @flow
 
 var ParentFoo = {foo: 'bar'};
@@ -13,7 +13,7 @@ module.exports = { ParentFoo };
 "
 `;
 
-exports[`main.js 1`] = `
+exports[`main.js-flow 1`] = `
 "// @flow
 
 var Parent = require('./Parent');
@@ -64,7 +64,7 @@ import type { Foo } from \\"./types\\";
 "
 `;
 
-exports[`override.js 1`] = `
+exports[`override.js-flow 1`] = `
 "// @flow
 
 class C {
@@ -95,7 +95,7 @@ class D extends C {
 "
 `;
 
-exports[`react.js 1`] = `
+exports[`react.js-flow 1`] = `
 "var React = require('react');
 
 class C extends React.Component {
@@ -122,7 +122,7 @@ let msg = \\"hello\\";
 "
 `;
 
-exports[`types.js 1`] = `
+exports[`types.js-flow 1`] = `
 "// @flow
 
 export type Foo = {};
diff --git a/tests/flow/get-def2/lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/get-def2/lib/__snapshots__/jsfmt.spec.js.snap
index 85d8aec26..48b2a5749 100644
--- a/tests/flow/get-def2/lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/get-def2/lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`jsx.js 1`] = `
+exports[`jsx.js-flow 1`] = `
 "declare var $React: $Exports<'react'>; // fake import
 type $JSXIntrinsic<T> = Class<$React.Component<void,T,mixed>>;
 
diff --git a/tests/flow/get-imports-and-importers/__snapshots__/jsfmt.spec.js.snap b/tests/flow/get-imports-and-importers/__snapshots__/jsfmt.spec.js.snap
index 09af19f6d..e07852f48 100644
--- a/tests/flow/get-imports-and-importers/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/get-imports-and-importers/__snapshots__/jsfmt.spec.js.snap
@@ -1,13 +1,13 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`a.js 1`] = `
+exports[`a.js-flow 1`] = `
 "// @flow
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 // @flow
 "
 `;
 
-exports[`b.js 1`] = `
+exports[`b.js-flow 1`] = `
 "/**
  * @flow
  * @providesModule b
@@ -22,7 +22,7 @@ require(\\"./a\\");
 "
 `;
 
-exports[`c.js 1`] = `
+exports[`c.js-flow 1`] = `
 "// @flow
 require('./a.js');
 require('b');
diff --git a/tests/flow/getters_and_setters_disabled/__snapshots__/jsfmt.spec.js.snap b/tests/flow/getters_and_setters_disabled/__snapshots__/jsfmt.spec.js.snap
index c9a2dafe2..4ea9a072d 100644
--- a/tests/flow/getters_and_setters_disabled/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/getters_and_setters_disabled/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`getters_and_setters.js 1`] = `
+exports[`getters_and_setters.js-flow 1`] = `
 "/**
  * @flow
  */
diff --git a/tests/flow/getters_and_setters_enabled/__snapshots__/jsfmt.spec.js.snap b/tests/flow/getters_and_setters_enabled/__snapshots__/jsfmt.spec.js.snap
index 4e80b1e76..7671b9ea6 100644
--- a/tests/flow/getters_and_setters_enabled/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/getters_and_setters_enabled/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`class.js 1`] = `
+exports[`class.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -133,7 +133,7 @@ foo.propOverriddenWithSetter = 123; // Error number ~> string
 "
 `;
 
-exports[`object.js 1`] = `
+exports[`object.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -273,7 +273,7 @@ var testExampleOrOrderOfGetterAndSetterReordered: number = obj.exampleOfOrderOfG
 "
 `;
 
-exports[`react.js 1`] = `
+exports[`react.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -304,7 +304,7 @@ React.createClass({
 "
 `;
 
-exports[`variance.js 1`] = `
+exports[`variance.js-flow 1`] = `
 "/* @flow */
 
 class A {}
diff --git a/tests/flow/haste_cycle/__snapshots__/jsfmt.spec.js.snap b/tests/flow/haste_cycle/__snapshots__/jsfmt.spec.js.snap
index 48d61ff57..4a1b0d3f4 100644
--- a/tests/flow/haste_cycle/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/haste_cycle/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`API.js 1`] = `
+exports[`API.js-flow 1`] = `
 "// @flow
 
 var OpenGraphObject = require('./models/OpenGraphObject.js');
diff --git a/tests/flow/haste_cycle/models/__snapshots__/jsfmt.spec.js.snap b/tests/flow/haste_cycle/models/__snapshots__/jsfmt.spec.js.snap
index baff21cd7..049619632 100644
--- a/tests/flow/haste_cycle/models/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/haste_cycle/models/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`OpenGraphAction.js 1`] = `
+exports[`OpenGraphAction.js-flow 1`] = `
 "// @flow
 
 var OpenGraphValueContainer = require('./OpenGraphValueContainer.js');
@@ -11,7 +11,7 @@ var OpenGraphValueContainer = require(\\"./OpenGraphValueContainer.js\\");
 "
 `;
 
-exports[`OpenGraphObject.js 1`] = `
+exports[`OpenGraphObject.js-flow 1`] = `
 "// @flow
 
 var OpenGraphValueContainer = require('./OpenGraphValueContainer.js');
@@ -22,7 +22,7 @@ var OpenGraphValueContainer = require(\\"./OpenGraphValueContainer.js\\");
 "
 `;
 
-exports[`OpenGraphValueContainer.js 1`] = `
+exports[`OpenGraphValueContainer.js-flow 1`] = `
 "// @flow
 
 var OpenGraphObject = require('./OpenGraphObject.js');
diff --git a/tests/flow/haste_dupe/__snapshots__/jsfmt.spec.js.snap b/tests/flow/haste_dupe/__snapshots__/jsfmt.spec.js.snap
index 56742bec9..eb173014b 100644
--- a/tests/flow/haste_dupe/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/haste_dupe/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`dupe1.js 1`] = `
+exports[`dupe1.js-flow 1`] = `
 "/**
  * Dupe provider 1/2
  * @providesModule Dupe
@@ -17,7 +17,7 @@ module.exports = \\"dupe1\\";
 "
 `;
 
-exports[`dupe2.js 1`] = `
+exports[`dupe2.js-flow 1`] = `
 "/**
  * Dupe provider 2/2
  * @providesModule Dupe
@@ -34,7 +34,7 @@ module.exports = \\"dupe2\\";
 "
 `;
 
-exports[`requires_dupe.js 1`] = `
+exports[`requires_dupe.js-flow 1`] = `
 "/**
  * depends on doubly-provided module
  * @flow
diff --git a/tests/flow/ignore_package/__snapshots__/jsfmt.spec.js.snap b/tests/flow/ignore_package/__snapshots__/jsfmt.spec.js.snap
index 8db463bf1..969f9b1f6 100644
--- a/tests/flow/ignore_package/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/ignore_package/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "/** @flow */
 /* this require routes to nothing, because
    our node_modules/underscore directory
diff --git a/tests/flow/immutable_methods/__snapshots__/jsfmt.spec.js.snap b/tests/flow/immutable_methods/__snapshots__/jsfmt.spec.js.snap
index c2f793b90..1725ecb52 100644
--- a/tests/flow/immutable_methods/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/immutable_methods/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "class A {
     foo(): A { return this; }
 }
diff --git a/tests/flow/import_type/__snapshots__/jsfmt.spec.js.snap b/tests/flow/import_type/__snapshots__/jsfmt.spec.js.snap
index 657b49352..82cdcfce2 100644
--- a/tests/flow/import_type/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/import_type/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`ExportCJSDefault_Class.js 1`] = `
+exports[`ExportCJSDefault_Class.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -31,7 +31,7 @@ module.exports = ClassFoo3;
 "
 `;
 
-exports[`ExportCJSNamed_Class.js 1`] = `
+exports[`ExportCJSNamed_Class.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -82,7 +82,7 @@ exports.foo5Inst = new ClassFoo5();
 "
 `;
 
-exports[`ExportDefault_Class.js 1`] = `
+exports[`ExportDefault_Class.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -109,7 +109,7 @@ export var foo1Inst = new ClassFoo1();
 "
 `;
 
-exports[`ExportNamed_Alias.js 1`] = `
+exports[`ExportNamed_Alias.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -140,7 +140,7 @@ export function givesAFoo3Obj(): AliasFoo3 {
 "
 `;
 
-exports[`ExportNamed_Class.js 1`] = `
+exports[`ExportNamed_Class.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -167,7 +167,7 @@ export var foo2Inst = new ClassFoo2();
 "
 `;
 
-exports[`ExportsANumber.js 1`] = `
+exports[`ExportsANumber.js-flow 1`] = `
 "/* @ flow */
 
 export var numValue = 42;
@@ -178,7 +178,7 @@ export var numValue = 42;
 "
 `;
 
-exports[`import_type.js 1`] = `
+exports[`import_type.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -347,7 +347,7 @@ function foo() {
 "
 `;
 
-exports[`import_type_specifier.js 1`] = `
+exports[`import_type_specifier.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -364,7 +364,7 @@ import type {} from \\"foo\\";
 "
 `;
 
-exports[`issue-359.js 1`] = `
+exports[`issue-359.js-flow 1`] = `
 "/* @flow */
 
 class ClassFoo6 {};
diff --git a/tests/flow/import_typeof/__snapshots__/jsfmt.spec.js.snap b/tests/flow/import_typeof/__snapshots__/jsfmt.spec.js.snap
index 61939382b..451cac8b0 100644
--- a/tests/flow/import_typeof/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/import_typeof/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`ExportCJSDefault_Class.js 1`] = `
+exports[`ExportCJSDefault_Class.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -31,7 +31,7 @@ module.exports = ClassFoo3;
 "
 `;
 
-exports[`ExportCJSDefault_Number.js 1`] = `
+exports[`ExportCJSDefault_Number.js-flow 1`] = `
 "/* @flow */
 
 module.exports = 42;
@@ -42,7 +42,7 @@ module.exports = 42;
 "
 `;
 
-exports[`ExportCJSNamed_Class.js 1`] = `
+exports[`ExportCJSNamed_Class.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -61,7 +61,7 @@ exports.ClassFoo4 = ClassFoo4;
 "
 `;
 
-exports[`ExportCJSNamed_Number.js 1`] = `
+exports[`ExportCJSNamed_Number.js-flow 1`] = `
 "/* @flow */
 
 exports.num = 42;
@@ -72,7 +72,7 @@ exports.num = 42;
 "
 `;
 
-exports[`ExportDefault_Class.js 1`] = `
+exports[`ExportDefault_Class.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -97,7 +97,7 @@ export default ClassFoo1;
 "
 `;
 
-exports[`ExportDefault_Number.js 1`] = `
+exports[`ExportDefault_Number.js-flow 1`] = `
 "/* @flow */
 
 export default 42;
@@ -108,7 +108,7 @@ export default 42;
 "
 `;
 
-exports[`ExportNamed_Alias.js 1`] = `
+exports[`ExportNamed_Alias.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -139,7 +139,7 @@ export function givesAFoo3Obj(): AliasFoo3 {
 "
 `;
 
-exports[`ExportNamed_Class.js 1`] = `
+exports[`ExportNamed_Class.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -164,7 +164,7 @@ export { ClassFoo2 };
 "
 `;
 
-exports[`ExportNamed_Multi.js 1`] = `
+exports[`ExportNamed_Multi.js-flow 1`] = `
 "// @flow
 
 export var num = 42;
@@ -177,7 +177,7 @@ export var str = \\"asdf\\";
 "
 `;
 
-exports[`ExportNamed_Number.js 1`] = `
+exports[`ExportNamed_Number.js-flow 1`] = `
 "/* @flow */
 
 export var num = 42;
@@ -188,7 +188,7 @@ export var num = 42;
 "
 `;
 
-exports[`import_typeof.js 1`] = `
+exports[`import_typeof.js-flow 1`] = `
 "/**
  * @flow
  */
diff --git a/tests/flow/include/foo/batman/__snapshots__/jsfmt.spec.js.snap b/tests/flow/include/foo/batman/__snapshots__/jsfmt.spec.js.snap
index fe5ba8d4d..88fadd97c 100644
--- a/tests/flow/include/foo/batman/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/include/foo/batman/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`baz.js 1`] = `
+exports[`baz.js-flow 1`] = `
 "/* @flow */
 
 var x: number = \\"not a number\\" // Error string ~> number
diff --git a/tests/flow/include/included/__snapshots__/jsfmt.spec.js.snap b/tests/flow/include/included/__snapshots__/jsfmt.spec.js.snap
index 9fb80d25a..8953ea276 100644
--- a/tests/flow/include/included/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/include/included/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "(123: string);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 (123: string);
diff --git a/tests/flow/incremental/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental/__snapshots__/jsfmt.spec.js.snap
index 50ce651ab..f7d26c7bf 100644
--- a/tests/flow/incremental/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental/__snapshots__/jsfmt.spec.js.snap
@@ -1,13 +1,13 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`a.js 1`] = `
+exports[`a.js-flow 1`] = `
 "/* @providesModule IncrModuleA */
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 /* @providesModule IncrModuleA */
 "
 `;
 
-exports[`b.js 1`] = `
+exports[`b.js-flow 1`] = `
 "/* @providesModule IncrModuleB
    @flow
 */
@@ -22,7 +22,7 @@ var A = require(\\"IncrModuleA\\");
 "
 `;
 
-exports[`dup_a.js 1`] = `
+exports[`dup_a.js-flow 1`] = `
 "/* @providesModule IncrModuleA */
 
 var x:string = 0;
diff --git a/tests/flow/incremental_basic/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental_basic/__snapshots__/jsfmt.spec.js.snap
index c1edbeb03..07238a82b 100644
--- a/tests/flow/incremental_basic/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental_basic/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`a.js 1`] = `
+exports[`a.js-flow 1`] = `
 "// @flow
 var a: string = 0;
 module.exports = a;
@@ -11,7 +11,7 @@ module.exports = a;
 "
 `;
 
-exports[`b.js 1`] = `
+exports[`b.js-flow 1`] = `
 "// @flow
 var a = require('./a');
 var b: number = a;
@@ -24,7 +24,7 @@ module.exports = b;
 "
 `;
 
-exports[`c.js 1`] = `
+exports[`c.js-flow 1`] = `
 "// @flow
 var b = require('./b');
 var c: string = b;
diff --git a/tests/flow/incremental_basic/tmp1/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental_basic/tmp1/__snapshots__/jsfmt.spec.js.snap
index d3082e1cd..b3417b251 100644
--- a/tests/flow/incremental_basic/tmp1/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental_basic/tmp1/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`b.js 1`] = `
+exports[`b.js-flow 1`] = `
 "// @flow
 var a = require('./a');
 var b = a;
diff --git a/tests/flow/incremental_basic/tmp2/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental_basic/tmp2/__snapshots__/jsfmt.spec.js.snap
index 52eea8e27..823373fda 100644
--- a/tests/flow/incremental_basic/tmp2/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental_basic/tmp2/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`a.js 1`] = `
+exports[`a.js-flow 1`] = `
 "// @flow
 var a = 0;
 module.exports = a;
diff --git a/tests/flow/incremental_basic/tmp3/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental_basic/tmp3/__snapshots__/jsfmt.spec.js.snap
index 31fd55365..d37710d7b 100644
--- a/tests/flow/incremental_basic/tmp3/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental_basic/tmp3/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`b.js 1`] = `
+exports[`b.js-flow 1`] = `
 "// @flow
 var a = require('./a');
 var b: number = a;
diff --git a/tests/flow/incremental_cycle/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental_cycle/__snapshots__/jsfmt.spec.js.snap
index bb21e6316..022b0c11c 100644
--- a/tests/flow/incremental_cycle/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental_cycle/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "// @flow
 
 class A {
@@ -21,7 +21,7 @@ module.exports = A;
 "
 `;
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "// @flow
 var A = require ('./A');
 import type C from './C';
@@ -44,7 +44,7 @@ module.exports = B;
 "
 `;
 
-exports[`C.js 1`] = `
+exports[`C.js-flow 1`] = `
 "// @flow
 var A = require ('./A');
 import type B from './B';
diff --git a/tests/flow/incremental_cycle/tmp1/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental_cycle/tmp1/__snapshots__/jsfmt.spec.js.snap
index ece381c84..637fc1e89 100644
--- a/tests/flow/incremental_cycle/tmp1/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental_cycle/tmp1/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "// @flow
 var A = require ('./A');
 import type C from './C';
@@ -15,7 +15,7 @@ export type B = string;
 "
 `;
 
-exports[`C.js 1`] = `
+exports[`C.js-flow 1`] = `
 "// @flow
 var A = require ('./A');
 import type { B } from './B'
diff --git a/tests/flow/incremental_cycle/tmp2/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental_cycle/tmp2/__snapshots__/jsfmt.spec.js.snap
index b1877e534..852848f7c 100644
--- a/tests/flow/incremental_cycle/tmp2/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental_cycle/tmp2/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "// @flow
 var A = require ('./A');
 //import type C from './C';
diff --git a/tests/flow/incremental_cycle/tmp3/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental_cycle/tmp3/__snapshots__/jsfmt.spec.js.snap
index c680a7bef..aa67203f1 100644
--- a/tests/flow/incremental_cycle/tmp3/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental_cycle/tmp3/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "// @flow
 var A = require ('./A');
 import type C from './C';
diff --git a/tests/flow/incremental_delete/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental_delete/__snapshots__/jsfmt.spec.js.snap
index b3735dc58..58965a187 100644
--- a/tests/flow/incremental_delete/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental_delete/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`a.js 1`] = `
+exports[`a.js-flow 1`] = `
 "// @flow
 var a: string = 0;
 module.exports = a;
@@ -11,7 +11,7 @@ module.exports = a;
 "
 `;
 
-exports[`b.js 1`] = `
+exports[`b.js-flow 1`] = `
 "// @flow
 var a = require('./a');
 var b: number = a;
@@ -24,7 +24,7 @@ module.exports = b;
 "
 `;
 
-exports[`c.js 1`] = `
+exports[`c.js-flow 1`] = `
 "// @flow
 var b = require('./b');
 var c: string = b;
@@ -37,7 +37,7 @@ module.exports = c;
 "
 `;
 
-exports[`dupe1.js 1`] = `
+exports[`dupe1.js-flow 1`] = `
 "/**
  * Dupe provider 1/2
  * @providesModule Dupe
@@ -54,7 +54,7 @@ module.exports = \\"dupe1\\";
 "
 `;
 
-exports[`dupe2.js 1`] = `
+exports[`dupe2.js-flow 1`] = `
 "/**
  * Dupe provider 2/2
  * @providesModule Dupe
@@ -71,7 +71,7 @@ module.exports = \\"dupe2\\";
 "
 `;
 
-exports[`requires_dupe.js 1`] = `
+exports[`requires_dupe.js-flow 1`] = `
 "/**
  * depends on doubly-provided module
  * @flow
@@ -86,7 +86,7 @@ var dupe = require(\\"Dupe\\");
 "
 `;
 
-exports[`requires_unchecked.js 1`] = `
+exports[`requires_unchecked.js-flow 1`] = `
 "/**
  * depends on an unchecked module, which will be deleted
  * @flow
@@ -101,7 +101,7 @@ var unchecked = require(\\"Unchecked\\");
 "
 `;
 
-exports[`unchecked.js 1`] = `
+exports[`unchecked.js-flow 1`] = `
 "/**
  * Not a flow module.
  * @providesModule Unchecked
diff --git a/tests/flow/incremental_duplicate_delete/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental_duplicate_delete/__snapshots__/jsfmt.spec.js.snap
index e5d93d64c..2fd48345e 100644
--- a/tests/flow/incremental_duplicate_delete/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental_duplicate_delete/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "/**
  * @providesModule A
  * @flow
diff --git a/tests/flow/incremental_json/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental_json/__snapshots__/jsfmt.spec.js.snap
index c7c3ed93f..c01ecbba6 100644
--- a/tests/flow/incremental_json/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental_json/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "/**
  * @flow
  */
diff --git a/tests/flow/incremental_mixed_naming_cycle/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental_mixed_naming_cycle/__snapshots__/jsfmt.spec.js.snap
index cdd9179c0..a6828aafc 100644
--- a/tests/flow/incremental_mixed_naming_cycle/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental_mixed_naming_cycle/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`a.js 1`] = `
+exports[`a.js-flow 1`] = `
 "/**
  * @providesModule A
  * @flow
@@ -23,7 +23,7 @@ module.exports = \\"A\\";
 "
 `;
 
-exports[`b.js 1`] = `
+exports[`b.js-flow 1`] = `
 "/**
  * @providesModule B
  * @flow
@@ -46,7 +46,7 @@ module.exports = \\"B\\";
 "
 `;
 
-exports[`c.js 1`] = `
+exports[`c.js-flow 1`] = `
 "/**
  * @providesModule C
  * @flow
@@ -69,7 +69,7 @@ module.exports = \\"C\\";
 "
 `;
 
-exports[`d.js 1`] = `
+exports[`d.js-flow 1`] = `
 "/**
  * @providesModule D
  * @flow
@@ -90,7 +90,7 @@ module.exports = \\"D\\";
 "
 `;
 
-exports[`root.js 1`] = `
+exports[`root.js-flow 1`] = `
 "/**
  * @providesModule Root
  * @flow
diff --git a/tests/flow/incremental_mixed_naming_cycle/tmp1/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental_mixed_naming_cycle/tmp1/__snapshots__/jsfmt.spec.js.snap
index ee3cd71ba..9d91d3d4f 100644
--- a/tests/flow/incremental_mixed_naming_cycle/tmp1/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental_mixed_naming_cycle/tmp1/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`root.js 1`] = `
+exports[`root.js-flow 1`] = `
 "/**
  * @providesModule Root
  * @flow
diff --git a/tests/flow/incremental_non_flow_move/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental_non_flow_move/__snapshots__/jsfmt.spec.js.snap
index 8509cf839..f34723eab 100644
--- a/tests/flow/incremental_non_flow_move/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental_non_flow_move/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "/*
  * @providesModule Foo
  */
@@ -11,7 +11,7 @@ exports[`foo.js 1`] = `
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "/**
  * @flow
  */
diff --git a/tests/flow/incremental_path/dir/__snapshots__/jsfmt.spec.js.snap b/tests/flow/incremental_path/dir/__snapshots__/jsfmt.spec.js.snap
index 7ffab3767..faee048c9 100644
--- a/tests/flow/incremental_path/dir/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/incremental_path/dir/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`a.js 1`] = `
+exports[`a.js-flow 1`] = `
 "// @flow
 (require('b'): boolean);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/indexer/__snapshots__/jsfmt.spec.js.snap b/tests/flow/indexer/__snapshots__/jsfmt.spec.js.snap
index f06969d11..7f669b5d5 100644
--- a/tests/flow/indexer/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/indexer/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "// No indexer should be fine
 function foo0(): {} {
   return { foo: \\"bar\\" }
@@ -83,7 +83,7 @@ function foo7(): { [key: string]: number, foo: number } {
 "
 `;
 
-exports[`multiple.js 1`] = `
+exports[`multiple.js-flow 1`] = `
 "// @flow
 
 let tests = [
diff --git a/tests/flow/init/__snapshots__/jsfmt.spec.js.snap b/tests/flow/init/__snapshots__/jsfmt.spec.js.snap
index a0252be55..71607ba9d 100644
--- a/tests/flow/init/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/init/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`hoisted.js 1`] = `
+exports[`hoisted.js-flow 1`] = `
 "/**
  * test initialization tracking in the presence of hoisting
  * @flow
@@ -97,7 +97,7 @@ function _for_of(arr: Array<number>) {
 "
 `;
 
-exports[`hoisted2.js 1`] = `
+exports[`hoisted2.js-flow 1`] = `
 "/**
  * test initialization tracking for vars
  * note: for try/catch/finally, see tests/try/init.js
@@ -638,7 +638,7 @@ function for_in_post_init() {
 "
 `;
 
-exports[`let.js 1`] = `
+exports[`let.js-flow 1`] = `
 "/**
  * test initialization tracking for lets
  * @flow
@@ -961,7 +961,7 @@ function sub_closure_init_reference() {
 "
 `;
 
-exports[`nullable-init.js 1`] = `
+exports[`nullable-init.js-flow 1`] = `
 "var o: {x: ?number} = { x: null };
 var a: Array<?number> = [null,null];
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/instanceof/__snapshots__/jsfmt.spec.js.snap b/tests/flow/instanceof/__snapshots__/jsfmt.spec.js.snap
index 766182e0b..987732c78 100644
--- a/tests/flow/instanceof/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/instanceof/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`instanceof.js 1`] = `
+exports[`instanceof.js-flow 1`] = `
 "/* @flow */
 
 // x instancof t
diff --git a/tests/flow/integration/__snapshots__/jsfmt.spec.js.snap b/tests/flow/integration/__snapshots__/jsfmt.spec.js.snap
index ee83f3ef2..fe6aad9c8 100644
--- a/tests/flow/integration/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/integration/__snapshots__/jsfmt.spec.js.snap
@@ -1,13 +1,13 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`bar.js 1`] = `
+exports[`bar.js-flow 1`] = `
 "// @flow
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 // @flow
 "
 `;
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "// @flow
 require('./bar');
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/interface/__snapshots__/jsfmt.spec.js.snap b/tests/flow/interface/__snapshots__/jsfmt.spec.js.snap
index 7b4dd49c9..6a0e15d67 100644
--- a/tests/flow/interface/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/interface/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`import.js 1`] = `
+exports[`import.js-flow 1`] = `
 "interface I { x: number }
 export type J = I; // workaround for export interface
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -9,7 +9,7 @@ export type J = I; // workaround for export interface
 "
 `;
 
-exports[`indexer.js 1`] = `
+exports[`indexer.js-flow 1`] = `
 "// @flow
 
 interface Ok {
@@ -34,7 +34,7 @@ interface Bad {
 "
 `;
 
-exports[`interface.js 1`] = `
+exports[`interface.js-flow 1`] = `
 "declare class C { x: number; }
 
 var x: string = new C().x;
@@ -63,7 +63,7 @@ function testInterfaceName(o: I) {
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "interface I { y: string }
 interface I_ { x: number }
 interface J extends I, I_ { }
@@ -112,7 +112,7 @@ var e: E<number> = { x: \\"\\", y: \\"\\", z: \\"\\" }; // error: x and z should
 "
 `;
 
-exports[`test2.js 1`] = `
+exports[`test2.js-flow 1`] = `
 "import type { J } from './import';
 interface K { }
 interface L extends J, K { y: string }
@@ -145,7 +145,7 @@ function bar(m: M) {
 "
 `;
 
-exports[`test3.js 1`] = `
+exports[`test3.js-flow 1`] = `
 "interface I { x: number, y : string }
 interface J { y : number }
 interface K extends I, J { x: string } // error: x is number in I
@@ -164,7 +164,7 @@ function foo(k: K) {
 "
 `;
 
-exports[`test4.js 1`] = `
+exports[`test4.js-flow 1`] = `
 "interface I { foo(x: number): void; }
 (function foo(x: number) { }: I); // error, property \`foo\` not found function
 
diff --git a/tests/flow/intersection/__snapshots__/jsfmt.spec.js.snap b/tests/flow/intersection/__snapshots__/jsfmt.spec.js.snap
index 1a95c7f3b..bf214a75d 100644
--- a/tests/flow/intersection/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/intersection/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`intersection.js 1`] = `
+exports[`intersection.js-flow 1`] = `
 "function foo(x: $All<Error,{type:number}>): number {
     return x.type;
 }
@@ -19,7 +19,7 @@ function bar(x: Error & { type: number }): number {
 "
 `;
 
-exports[`objassign.js 1`] = `
+exports[`objassign.js-flow 1`] = `
 "/**
  * Test intersection of objects flowing to spread assignment.
  *
@@ -46,7 +46,7 @@ let y: ObjAssignT = { ...x }; // should be fine
 "
 `;
 
-exports[`pred.js 1`] = `
+exports[`pred.js-flow 1`] = `
 "/**
  * Test interaction of object intersections and predicates.
  * Definitions in lib/lib.js
@@ -101,7 +101,7 @@ function hasObjectMode_ok(options: DuplexStreamOptions): boolean {
 "
 `;
 
-exports[`test_fun.js 1`] = `
+exports[`test_fun.js-flow 1`] = `
 "/**
  * Tests for intersections of function types.
  *
@@ -168,7 +168,7 @@ var g: (_: number | string) => void = f;
 "
 `;
 
-exports[`test_obj.js 1`] = `
+exports[`test_obj.js-flow 1`] = `
 "/**
  * Tests for intersections of object types
  *
diff --git a/tests/flow/intersection/lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/intersection/lib/__snapshots__/jsfmt.spec.js.snap
index c00b6ad09..45c0094e5 100644
--- a/tests/flow/intersection/lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/intersection/lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`lib.js 1`] = `
+exports[`lib.js-flow 1`] = `
 "// @flow
 
 // defs used in tests, here to stress tvar machinery
diff --git a/tests/flow/issues-11/__snapshots__/jsfmt.spec.js.snap b/tests/flow/issues-11/__snapshots__/jsfmt.spec.js.snap
index 71da3bf27..85e30d496 100644
--- a/tests/flow/issues-11/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/issues-11/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`export.js 1`] = `
+exports[`export.js-flow 1`] = `
 "/* @flow */
 exports.x = 1;
 exports.y = \\"\\";
@@ -11,7 +11,7 @@ exports.y = \\"\\";
 "
 `;
 
-exports[`import.js 1`] = `
+exports[`import.js-flow 1`] = `
 "/* @flow */
 var e = require('./export');
 var x: string = e.x;
diff --git a/tests/flow/iter/__snapshots__/jsfmt.spec.js.snap b/tests/flow/iter/__snapshots__/jsfmt.spec.js.snap
index bf18c14a2..66064222e 100644
--- a/tests/flow/iter/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/iter/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`iter.js 1`] = `
+exports[`iter.js-flow 1`] = `
 "var a = [true,false];
 function foo(x) { }
 
diff --git a/tests/flow/iterable/__snapshots__/jsfmt.spec.js.snap b/tests/flow/iterable/__snapshots__/jsfmt.spec.js.snap
index 6a6b92ed2..df3e99375 100644
--- a/tests/flow/iterable/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/iterable/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`array.js 1`] = `
+exports[`array.js-flow 1`] = `
 "/* @flow */
 
 var arrayTest1: Iterable<number> = ([1, 2]: Array<number>);
@@ -25,7 +25,7 @@ var arrayTest5: Iterable<string> = [\\"hi\\", 1];
 "
 `;
 
-exports[`caching_bug.js 1`] = `
+exports[`caching_bug.js-flow 1`] = `
 "/* @flow */
 
 /**
@@ -76,7 +76,7 @@ function miss_the_cache(x: Array<string | number>): Iterable<string> {
 "
 `;
 
-exports[`iter.js 1`] = `
+exports[`iter.js-flow 1`] = `
 "/* @flow */
 
 function foo(strs: Iterable<string>): void {
@@ -103,7 +103,7 @@ foo(m.keys());
 "
 `;
 
-exports[`iterator_result.js 1`] = `
+exports[`iterator_result.js-flow 1`] = `
 "/* @flow */
 
 function makeIterator(coin_flip: () => boolean ): Iterator<string> {
@@ -171,7 +171,7 @@ function makeIterator(coin_flip: () => boolean): Iterator<string> {
 "
 `;
 
-exports[`map.js 1`] = `
+exports[`map.js-flow 1`] = `
 "/* @flow */
 
 function mapTest1(map: Map<string, number>): Iterable<[string, number]> {
@@ -206,7 +206,7 @@ function mapTest4(map: Map<number, string>): Iterable<string> {
 "
 `;
 
-exports[`set.js 1`] = `
+exports[`set.js-flow 1`] = `
 "/* @flow */
 
 function setTest1(set: Set<string>): Iterable<string> {
@@ -241,7 +241,7 @@ function setTest4(set: Set<string>): Iterable<number> {
 "
 `;
 
-exports[`string.js 1`] = `
+exports[`string.js-flow 1`] = `
 "/* @flow */
 
 var stringTest1: Iterable<string> = \\"hi\\";
@@ -256,7 +256,7 @@ var stringTest3: Iterable<number> = \\"hi\\"; // Error - string is a Iterable<st
 "
 `;
 
-exports[`variance.js 1`] = `
+exports[`variance.js-flow 1`] = `
 "/* @flow */
 
 (([]: Array<string>): Iterable<?string>); // ok, Iterable<+T>
diff --git a/tests/flow/jsx_intrinsics.builtin/__snapshots__/jsfmt.spec.js.snap b/tests/flow/jsx_intrinsics.builtin/__snapshots__/jsfmt.spec.js.snap
index 207637c54..8805ddae9 100644
--- a/tests/flow/jsx_intrinsics.builtin/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/jsx_intrinsics.builtin/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`main.js 1`] = `
+exports[`main.js-flow 1`] = `
 "// @flow
 
 var React = require('react');
@@ -49,7 +49,7 @@ var e: React.Element<{ not_a_real_attr: string }> = (
 "
 `;
 
-exports[`strings.js 1`] = `
+exports[`strings.js-flow 1`] = `
 "/* @flow */
 
 var React = require('react');
diff --git a/tests/flow/jsx_intrinsics.custom/__snapshots__/jsfmt.spec.js.snap b/tests/flow/jsx_intrinsics.custom/__snapshots__/jsfmt.spec.js.snap
index 4e1abc7cd..12695ef82 100644
--- a/tests/flow/jsx_intrinsics.custom/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/jsx_intrinsics.custom/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`main.js 1`] = `
+exports[`main.js-flow 1`] = `
 "// @flow
 
 var React = require('react');
@@ -39,7 +39,7 @@ var d: React.Element<{ id: number }> = <div id=\\"asdf\\" />; // Error: Props<{i
 "
 `;
 
-exports[`strings.js 1`] = `
+exports[`strings.js-flow 1`] = `
 "/* @flow */
 
 var React = require('react');
diff --git a/tests/flow/jsx_intrinsics.custom/lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/jsx_intrinsics.custom/lib/__snapshots__/jsfmt.spec.js.snap
index 85d8aec26..48b2a5749 100644
--- a/tests/flow/jsx_intrinsics.custom/lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/jsx_intrinsics.custom/lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`jsx.js 1`] = `
+exports[`jsx.js-flow 1`] = `
 "declare var $React: $Exports<'react'>; // fake import
 type $JSXIntrinsic<T> = Class<$React.Component<void,T,mixed>>;
 
diff --git a/tests/flow/keys/__snapshots__/jsfmt.spec.js.snap b/tests/flow/keys/__snapshots__/jsfmt.spec.js.snap
index aab3f39f3..8ffee8559 100644
--- a/tests/flow/keys/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/keys/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`keys.js 1`] = `
+exports[`keys.js-flow 1`] = `
 "/* @flow */
 
 function testKeysOfObject(str: string, lit: 'hi') {
diff --git a/tests/flow/keyvalue/__snapshots__/jsfmt.spec.js.snap b/tests/flow/keyvalue/__snapshots__/jsfmt.spec.js.snap
index 0d9ab0282..305362195 100644
--- a/tests/flow/keyvalue/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/keyvalue/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`keyvalue.js 1`] = `
+exports[`keyvalue.js-flow 1`] = `
 "// @flow
 
 let tests = [
diff --git a/tests/flow/last_duplicate_property_wins/__snapshots__/jsfmt.spec.js.snap b/tests/flow/last_duplicate_property_wins/__snapshots__/jsfmt.spec.js.snap
index 59b6c9de8..ca6ed5264 100644
--- a/tests/flow/last_duplicate_property_wins/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/last_duplicate_property_wins/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "// @flow
 
 // Classes
diff --git a/tests/flow/lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/lib/__snapshots__/jsfmt.spec.js.snap
index 5ffc4ea5d..65699b728 100644
--- a/tests/flow/lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`libtest.js 1`] = `
+exports[`libtest.js-flow 1`] = `
 "var x:string = NaN
 var y:string = Number.MAX_VALUE;
 var z:number = new TypeError().name;
diff --git a/tests/flow/lib_interfaces/declarations/__snapshots__/jsfmt.spec.js.snap b/tests/flow/lib_interfaces/declarations/__snapshots__/jsfmt.spec.js.snap
index 1fe2466cb..089f0cd9c 100644
--- a/tests/flow/lib_interfaces/declarations/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/lib_interfaces/declarations/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`underscore.js 1`] = `
+exports[`underscore.js-flow 1`] = `
 "interface C<T> {
   foo(): CArrays<T>;
   bar(): C<any>;
diff --git a/tests/flow/libconfig/__snapshots__/jsfmt.spec.js.snap b/tests/flow/libconfig/__snapshots__/jsfmt.spec.js.snap
index fdaf23df8..de5dddf35 100644
--- a/tests/flow/libconfig/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/libconfig/__snapshots__/jsfmt.spec.js.snap
@@ -1,20 +1,20 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`libA.js 1`] = `
+exports[`libA.js-flow 1`] = `
 "declare function foo(x: number): void;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 declare function foo(x: number): void;
 "
 `;
 
-exports[`libB.js 1`] = `
+exports[`libB.js-flow 1`] = `
 "declare function bar(x: string): void;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 declare function bar(x: string): void;
 "
 `;
 
-exports[`libtest.js 1`] = `
+exports[`libtest.js-flow 1`] = `
 "foo(123);
 bar(123);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/libdef_ignored_module/__snapshots__/jsfmt.spec.js.snap b/tests/flow/libdef_ignored_module/__snapshots__/jsfmt.spec.js.snap
index baa4e444c..a01b6da93 100644
--- a/tests/flow/libdef_ignored_module/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/libdef_ignored_module/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "/* @flow */
 
 import foo from \\"foo\\";
diff --git a/tests/flow/libdef_ignored_module/lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/libdef_ignored_module/lib/__snapshots__/jsfmt.spec.js.snap
index 81b463e93..d01e7178b 100644
--- a/tests/flow/libdef_ignored_module/lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/libdef_ignored_module/lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "declare module foo {
   declare var bar: number;
 }
diff --git a/tests/flow/liberr/__snapshots__/jsfmt.spec.js.snap b/tests/flow/liberr/__snapshots__/jsfmt.spec.js.snap
index 5fe7539bc..bae8e2e2b 100644
--- a/tests/flow/liberr/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/liberr/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`a.js 1`] = `
+exports[`a.js-flow 1`] = `
 "/**
  * @flow
  */
diff --git a/tests/flow/liberr/libs/__snapshots__/jsfmt.spec.js.snap b/tests/flow/liberr/libs/__snapshots__/jsfmt.spec.js.snap
index 6f2a1e81f..05d62b8f7 100644
--- a/tests/flow/liberr/libs/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/liberr/libs/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`type_error.js 1`] = `
+exports[`type_error.js-flow 1`] = `
 "// @flow
 declare function foo(x: number): Array;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/libflow-typed/__snapshots__/jsfmt.spec.js.snap b/tests/flow/libflow-typed/__snapshots__/jsfmt.spec.js.snap
index 2a0466193..3626a289c 100644
--- a/tests/flow/libflow-typed/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/libflow-typed/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`libtest.js 1`] = `
+exports[`libtest.js-flow 1`] = `
 "/* @flow */
 const dino : Dinosaur = \\"Stegosaurus\\"
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/libflow-typed/flow-typed/__snapshots__/jsfmt.spec.js.snap b/tests/flow/libflow-typed/flow-typed/__snapshots__/jsfmt.spec.js.snap
index 8b35367c4..9ecdaf32c 100644
--- a/tests/flow/libflow-typed/flow-typed/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/libflow-typed/flow-typed/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`dino.js 1`] = `
+exports[`dino.js-flow 1`] = `
 "declare type Dinosaur = \\"T-Rex\\" | \\"Apatosaurus\\";
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 declare type Dinosaur = \\"T-Rex\\" | \\"Apatosaurus\\";
diff --git a/tests/flow/librec/__snapshots__/jsfmt.spec.js.snap b/tests/flow/librec/__snapshots__/jsfmt.spec.js.snap
index 9cd2cfe6f..c6a385896 100644
--- a/tests/flow/librec/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/librec/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`libtest.js 1`] = `
+exports[`libtest.js-flow 1`] = `
 "foo(123);
 bar(123);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/librec/lib/A/__snapshots__/jsfmt.spec.js.snap b/tests/flow/librec/lib/A/__snapshots__/jsfmt.spec.js.snap
index cf36e574c..55f4210ff 100644
--- a/tests/flow/librec/lib/A/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/librec/lib/A/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`libA.js 1`] = `
+exports[`libA.js-flow 1`] = `
 "declare function foo(x: number): void;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 declare function foo(x: number): void;
diff --git a/tests/flow/librec/lib/B/__snapshots__/jsfmt.spec.js.snap b/tests/flow/librec/lib/B/__snapshots__/jsfmt.spec.js.snap
index 0f8dde276..44dd59e80 100644
--- a/tests/flow/librec/lib/B/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/librec/lib/B/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`libB.js 1`] = `
+exports[`libB.js-flow 1`] = `
 "declare function bar(x: string): void;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 declare function bar(x: string): void;
diff --git a/tests/flow/literal/__snapshots__/jsfmt.spec.js.snap b/tests/flow/literal/__snapshots__/jsfmt.spec.js.snap
index 49b274554..c7aa7e681 100644
--- a/tests/flow/literal/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/literal/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`enum.js 1`] = `
+exports[`enum.js-flow 1`] = `
 "var APIKeys = {
     AGE: 'age',
     NAME: 'name',
@@ -17,7 +17,7 @@ module.exports = APIKeys;
 "
 `;
 
-exports[`enum_client.js 1`] = `
+exports[`enum_client.js-flow 1`] = `
 "var APIKeys = require('./enum');
 // object that maps \\"AGE\\" to \\"age\\", \\"NAME\\" to \\"name\\"
 
@@ -64,7 +64,7 @@ var red: string = tuple[indices.red]; // error: tuple[0] is a number
 "
 `;
 
-exports[`number.js 1`] = `
+exports[`number.js-flow 1`] = `
 "function test1(x: number): number {
   return -x;
 }
diff --git a/tests/flow/locals/__snapshots__/jsfmt.spec.js.snap b/tests/flow/locals/__snapshots__/jsfmt.spec.js.snap
index 7bcf82818..1d51bd6c4 100644
--- a/tests/flow/locals/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/locals/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`lex.js 1`] = `
+exports[`lex.js-flow 1`] = `
 "function switch_scope(x: mixed) {
   let a = \\"\\";
   let b = \\"\\";
@@ -125,7 +125,7 @@ function for_of_scope(xs: number[]) {
 "
 `;
 
-exports[`locals.js 1`] = `
+exports[`locals.js-flow 1`] = `
 "var x:string = 0;
 var x:number = 1;
 
diff --git a/tests/flow/logical/__snapshots__/jsfmt.spec.js.snap b/tests/flow/logical/__snapshots__/jsfmt.spec.js.snap
index 99ee49a6c..50807370d 100644
--- a/tests/flow/logical/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/logical/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`logical.js 1`] = `
+exports[`logical.js-flow 1`] = `
 "/* @flow */
 
 /**
diff --git a/tests/flow/loners/__snapshots__/jsfmt.spec.js.snap b/tests/flow/loners/__snapshots__/jsfmt.spec.js.snap
index fee0dc6ba..e3382d496 100644
--- a/tests/flow/loners/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/loners/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`loners.js 1`] = `
+exports[`loners.js-flow 1`] = `
 "var o = { x: 5, y: \\"jello\\" };
 var z = o.z;
 var export_o: { x: number; } = o;
diff --git a/tests/flow/method_properties/__snapshots__/jsfmt.spec.js.snap b/tests/flow/method_properties/__snapshots__/jsfmt.spec.js.snap
index 3aab06e46..9122d8477 100644
--- a/tests/flow/method_properties/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/method_properties/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`exports_optional_prop.js 1`] = `
+exports[`exports_optional_prop.js-flow 1`] = `
 "// @flow
 
 declare class Foo {
@@ -19,7 +19,7 @@ export { Foo };
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "class C {
   C() { }
   foo() { }
diff --git a/tests/flow/misc/__snapshots__/jsfmt.spec.js.snap b/tests/flow/misc/__snapshots__/jsfmt.spec.js.snap
index 7ff636eac..307a5a953 100644
--- a/tests/flow/misc/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/misc/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "
 /* @providesModule A */
 
@@ -32,7 +32,7 @@ f(A.x); // A.x is now a string, by def assign
 "
 `;
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "
 /* @providesModule B */
 
@@ -68,7 +68,7 @@ module.exports = B;
 "
 `;
 
-exports[`C.js 1`] = `
+exports[`C.js-flow 1`] = `
 "
 /* @providesModule C */
 
@@ -100,7 +100,7 @@ module.exports = C;
 "
 `;
 
-exports[`D.js 1`] = `
+exports[`D.js-flow 1`] = `
 "
 /* @providesModule D */
 
@@ -134,7 +134,7 @@ module.exports = \\"D for dummy\\";
 "
 `;
 
-exports[`E.js 1`] = `
+exports[`E.js-flow 1`] = `
 "
 /* @providesModule E */
 
@@ -158,7 +158,7 @@ module.exports = { obj: o };
 "
 `;
 
-exports[`F.js 1`] = `
+exports[`F.js-flow 1`] = `
 "function fn2(x) { return x.length * 4; }
 fn2({length: 'hi'});
 
@@ -177,7 +177,7 @@ function foo(x: Array<number>): string {
 "
 `;
 
-exports[`G.js 1`] = `
+exports[`G.js-flow 1`] = `
 "var a = { length: \\"duck\\" };
 a.length = 123;
 a.length();
diff --git a/tests/flow/missing_annotation/__snapshots__/jsfmt.spec.js.snap b/tests/flow/missing_annotation/__snapshots__/jsfmt.spec.js.snap
index bd9af98b7..427d1413a 100644
--- a/tests/flow/missing_annotation/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/missing_annotation/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`array.js 1`] = `
+exports[`array.js-flow 1`] = `
 "// @flow
 
 type Foo = {};
@@ -15,7 +15,7 @@ export var arr = [f];
 "
 `;
 
-exports[`async_return.js 1`] = `
+exports[`async_return.js-flow 1`] = `
 "// @flow
 
 export async function foo() {
@@ -30,7 +30,7 @@ export async function foo() {
 "
 `;
 
-exports[`infer.js 1`] = `
+exports[`infer.js-flow 1`] = `
 "/* @flow */
 
 var Foo = {
diff --git a/tests/flow/modified_lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/modified_lib/__snapshots__/jsfmt.spec.js.snap
index 3c678d30b..c9d381177 100644
--- a/tests/flow/modified_lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/modified_lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "// @flow
 
 import {bar} from 'foo';
diff --git a/tests/flow/modified_lib/lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/modified_lib/lib/__snapshots__/jsfmt.spec.js.snap
index 799ce5f94..7c35e6fd4 100644
--- a/tests/flow/modified_lib/lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/modified_lib/lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`lib.js 1`] = `
+exports[`lib.js-flow 1`] = `
 "declare module 'foo' {
   declare function bar(str: string): number;
 }
diff --git a/tests/flow/module_not_found_errors/src/__snapshots__/jsfmt.spec.js.snap b/tests/flow/module_not_found_errors/src/__snapshots__/jsfmt.spec.js.snap
index 3348d752e..56ac71ad0 100644
--- a/tests/flow/module_not_found_errors/src/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/module_not_found_errors/src/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`index.js 1`] = `
+exports[`index.js-flow 1`] = `
 "// @flow
 
 require('module_completely_absent');
diff --git a/tests/flow/module_redirect/__snapshots__/jsfmt.spec.js.snap b/tests/flow/module_redirect/__snapshots__/jsfmt.spec.js.snap
index 5c4a9be36..f1a67d5e8 100644
--- a/tests/flow/module_redirect/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/module_redirect/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "declare module A {
   declare function foo(): string;
 }
@@ -11,7 +11,7 @@ declare module A {
 "
 `;
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "/**
  * @providesModule B
  * @flow
@@ -28,7 +28,7 @@ module.exports = require(\\"A\\");
 "
 `;
 
-exports[`C.js 1`] = `
+exports[`C.js-flow 1`] = `
 "/**
  * @providesModule C
  * @flow
@@ -45,7 +45,7 @@ module.exports = require(\\"B\\");
 "
 `;
 
-exports[`D.js 1`] = `
+exports[`D.js-flow 1`] = `
 "/**
  * @providesModule D
  * @flow
diff --git a/tests/flow/module_use_strict/__snapshots__/jsfmt.spec.js.snap b/tests/flow/module_use_strict/__snapshots__/jsfmt.spec.js.snap
index b17c28da9..5a2f8ef1b 100644
--- a/tests/flow/module_use_strict/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/module_use_strict/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "// @flow
 
 (01: number);
diff --git a/tests/flow/modules/__snapshots__/jsfmt.spec.js.snap b/tests/flow/modules/__snapshots__/jsfmt.spec.js.snap
index 1c45d3619..228de3f46 100644
--- a/tests/flow/modules/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/modules/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`cli.js 1`] = `
+exports[`cli.js-flow 1`] = `
 "/* @flow */
 
 var f = require('./lib');
@@ -15,7 +15,7 @@ var y: number = f(0);
 "
 `;
 
-exports[`cli2.js 1`] = `
+exports[`cli2.js-flow 1`] = `
 "/* @flow */
 
 var f = require('./lib');
@@ -30,7 +30,7 @@ f(\\"...\\");
 "
 `;
 
-exports[`lib.js 1`] = `
+exports[`lib.js-flow 1`] = `
 "/* @flow */
 
 function g(x:string) { }
diff --git a/tests/flow/more_annot/__snapshots__/jsfmt.spec.js.snap b/tests/flow/more_annot/__snapshots__/jsfmt.spec.js.snap
index 6862ec586..2b84de060 100644
--- a/tests/flow/more_annot/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/more_annot/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`client_object.js 1`] = `
+exports[`client_object.js-flow 1`] = `
 "var o = require('./object');
 
 var a:number = o.w.z.y;
@@ -11,7 +11,7 @@ var a: number = o.w.z.y;
 "
 `;
 
-exports[`object.js 1`] = `
+exports[`object.js-flow 1`] = `
 "var o1 = { x: 0, y: \\"\\" };
 var o2 = { z: o1 }
 
@@ -34,7 +34,7 @@ module.exports = o3;
 "
 `;
 
-exports[`proto.js 1`] = `
+exports[`proto.js-flow 1`] = `
 "function Foo() { this.x = 0; }
 Foo.prototype.m = function() { }
 
@@ -53,7 +53,7 @@ var o2: Foo = new Foo();
 "
 `;
 
-exports[`super.js 1`] = `
+exports[`super.js-flow 1`] = `
 "class C { m() { } }
 class D extends C { }
 
diff --git a/tests/flow/more_classes/__snapshots__/jsfmt.spec.js.snap b/tests/flow/more_classes/__snapshots__/jsfmt.spec.js.snap
index 0032363be..af259e3d6 100644
--- a/tests/flow/more_classes/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/more_classes/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Bar.js 1`] = `
+exports[`Bar.js-flow 1`] = `
 "
 /* @providesModule Bar */
 
@@ -44,7 +44,7 @@ module.exports = Bar;
 "
 `;
 
-exports[`Foo.js 1`] = `
+exports[`Foo.js-flow 1`] = `
 "
 /* @providesModule Foo */
 
@@ -100,7 +100,7 @@ module.exports = Foo;
 "
 `;
 
-exports[`Qux.js 1`] = `
+exports[`Qux.js-flow 1`] = `
 "
 /* @providesModule Qux */
 
diff --git a/tests/flow/more_generics/__snapshots__/jsfmt.spec.js.snap b/tests/flow/more_generics/__snapshots__/jsfmt.spec.js.snap
index 723c1b20b..4e9f569ae 100644
--- a/tests/flow/more_generics/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/more_generics/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`poly.js 1`] = `
+exports[`poly.js-flow 1`] = `
 "var foo1 = function<T>(x:T):T { return x; }
 
 function foo2<T,S>(x:T):S { return x; }
diff --git a/tests/flow/more_path/__snapshots__/jsfmt.spec.js.snap b/tests/flow/more_path/__snapshots__/jsfmt.spec.js.snap
index 1e5eca434..e9a22f6c3 100644
--- a/tests/flow/more_path/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/more_path/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Condition.js 1`] = `
+exports[`Condition.js-flow 1`] = `
 "/* @providesModule Condition */
 
 function f(x:number) { }
@@ -126,7 +126,7 @@ module.exports = true;
 "
 `;
 
-exports[`FlowSA.js 1`] = `
+exports[`FlowSA.js-flow 1`] = `
 "
 /* @providesModule FlowSA */
 
@@ -154,7 +154,7 @@ module.exports = FlowSA;
 "
 `;
 
-exports[`Sigma.js 1`] = `
+exports[`Sigma.js-flow 1`] = `
 "
 /* @providesModule Sigma */
 
@@ -245,7 +245,7 @@ module.exports = \\"sigma\\";
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "class BaseClass {
   baseProp: string;
 }
diff --git a/tests/flow/more_react/__snapshots__/jsfmt.spec.js.snap b/tests/flow/more_react/__snapshots__/jsfmt.spec.js.snap
index a31a0a25c..3b12236f6 100644
--- a/tests/flow/more_react/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/more_react/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`API.react.js 1`] = `
+exports[`API.react.js-flow 1`] = `
 "
 var app = require('JSX');
 
@@ -20,7 +20,7 @@ bar(app.props.children); // No error, App doesn't specify propTypes so anything
 "
 `;
 
-exports[`App.react.js 1`] = `
+exports[`App.react.js-flow 1`] = `
 "
 /**
  * @providesModule App.react
@@ -110,7 +110,7 @@ module.exports = App;
 "
 `;
 
-exports[`JSX.js 1`] = `
+exports[`JSX.js-flow 1`] = `
 "
 /* @providesModule JSX */
 
@@ -140,7 +140,7 @@ module.exports = app;
 "
 `;
 
-exports[`propTypes.js 1`] = `
+exports[`propTypes.js-flow 1`] = `
 "var React = require('React');
 
 var C = React.createClass({
diff --git a/tests/flow/more_statics/__snapshots__/jsfmt.spec.js.snap b/tests/flow/more_statics/__snapshots__/jsfmt.spec.js.snap
index 9a4ec6d6a..0c9dbc3cc 100644
--- a/tests/flow/more_statics/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/more_statics/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`class_static.js 1`] = `
+exports[`class_static.js-flow 1`] = `
 "class B {
     static foo(): string { return \\"\\"; }
 }
diff --git a/tests/flow/name_prop/__snapshots__/jsfmt.spec.js.snap b/tests/flow/name_prop/__snapshots__/jsfmt.spec.js.snap
index 705948456..42c02bcf1 100644
--- a/tests/flow/name_prop/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/name_prop/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`class.js 1`] = `
+exports[`class.js-flow 1`] = `
 "class A {}
 
 var test1 = A.bar; // Error bar doesn't exist
@@ -25,7 +25,7 @@ var test6: number = a.constructor.name; // Error string ~> number
 "
 `;
 
-exports[`function.js 1`] = `
+exports[`function.js-flow 1`] = `
 "/* TODO - we currently say that a function's statics are an AnyObjT and
  * anything goes. When we start enforcing the statics properly, we'll need to
  * know that .name exists
diff --git a/tests/flow/namespace/__snapshots__/jsfmt.spec.js.snap b/tests/flow/namespace/__snapshots__/jsfmt.spec.js.snap
index 3459fd94e..20588180b 100644
--- a/tests/flow/namespace/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/namespace/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`client.js 1`] = `
+exports[`client.js-flow 1`] = `
 "var ns = require('./namespace')
 
 var bar: string = ns.foo
@@ -11,7 +11,7 @@ var bar: string = ns.foo;
 "
 `;
 
-exports[`namespace.js 1`] = `
+exports[`namespace.js-flow 1`] = `
 "/*@flow*/// import type { T } from '...'
 type T = (x:number) => void;
 var f: T = function(x:string): void { }
diff --git a/tests/flow/new_react/__snapshots__/jsfmt.spec.js.snap b/tests/flow/new_react/__snapshots__/jsfmt.spec.js.snap
index 590423e2f..76f23db58 100644
--- a/tests/flow/new_react/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/new_react/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`FeedUFI.react.js 1`] = `
+exports[`FeedUFI.react.js-flow 1`] = `
 "/**
  * Copyright 2004-present Facebook. All Rights Reserved.
  *
@@ -79,7 +79,7 @@ module.exports = FeedUFI;
 "
 `;
 
-exports[`Mixin.js 1`] = `
+exports[`Mixin.js-flow 1`] = `
 "/* @providesModule Mixin */
 module.exports = {
     success: function() { }
@@ -92,7 +92,7 @@ module.exports = {
 "
 `;
 
-exports[`UFILikeCount.react.js 1`] = `
+exports[`UFILikeCount.react.js-flow 1`] = `
 "/**
  * Copyright 2004-present Facebook. All Rights Reserved.
  *
@@ -143,7 +143,7 @@ module.exports = UFILikeCount;
 "
 `;
 
-exports[`bad_default_props.js 1`] = `
+exports[`bad_default_props.js-flow 1`] = `
 "var React = require('React');
 
 type T1 = { }
@@ -214,7 +214,7 @@ class C6 extends React.Component {
 "
 `;
 
-exports[`classes.js 1`] = `
+exports[`classes.js-flow 1`] = `
 "var React = require('React');
 
 type DefaultProps = { };
@@ -379,7 +379,7 @@ FooLegacy.bar();
 "
 `;
 
-exports[`import-react.js 1`] = `
+exports[`import-react.js-flow 1`] = `
 "/* @flow */
 
 // Testing local binding of React in all kinds of ways. The only reason this
@@ -422,7 +422,7 @@ class HelloMessage extends React.Component {
 "
 `;
 
-exports[`new_react.js 1`] = `
+exports[`new_react.js-flow 1`] = `
 "var React = require('react');
 var Mixin = require('Mixin');
 var C = React.createClass({
@@ -492,7 +492,7 @@ var x: number = C.displayName;
 "
 `;
 
-exports[`propTypes.js 1`] = `
+exports[`propTypes.js-flow 1`] = `
 "var React = require('react');
 var PropTypes = React.PropTypes;
 
@@ -538,7 +538,7 @@ var props: Array<{ label: string, value?: number }> = [
 "
 `;
 
-exports[`props.js 1`] = `
+exports[`props.js-flow 1`] = `
 "var React = require('react');
 var TestProps = React.createClass({
 
@@ -596,7 +596,7 @@ var FooProps = React.createClass({
 "
 `;
 
-exports[`props2.js 1`] = `
+exports[`props2.js-flow 1`] = `
 "var React = require('react');
 var C = React.createClass({
     propTypes: {
@@ -635,7 +635,7 @@ var D = React.createClass({
 "
 `;
 
-exports[`props3.js 1`] = `
+exports[`props3.js-flow 1`] = `
 "var React = require('react');
 var TestProps = React.createClass({
     // Do something illegal inside of propTypes and make sure Flow notices
@@ -746,7 +746,7 @@ var TestProps = React.createClass({
 "
 `;
 
-exports[`props4.js 1`] = `
+exports[`props4.js-flow 1`] = `
 "// @flow
 
 import React from \\"React\\";
@@ -800,7 +800,7 @@ React.render(<Example foo=\\"foo\\" />, document.body);
 "
 `;
 
-exports[`props5.js 1`] = `
+exports[`props5.js-flow 1`] = `
 "var React = require('React');
 
 var C = React.createClass({
@@ -823,7 +823,7 @@ module.exports = C;
 "
 `;
 
-exports[`state.js 1`] = `
+exports[`state.js-flow 1`] = `
 "/* @flow */
 
 var React = require('react');
@@ -874,7 +874,7 @@ var ReactClass = React.createClass({
 "
 `;
 
-exports[`state2.js 1`] = `
+exports[`state2.js-flow 1`] = `
 "// @flow
 
 var React = require('react');
@@ -913,7 +913,7 @@ module.exports = Comp;
 "
 `;
 
-exports[`state3.js 1`] = `
+exports[`state3.js-flow 1`] = `
 "var React = require('react');
 var TestState = React.createClass({
 
@@ -952,7 +952,7 @@ var TestState = React.createClass({
 "
 `;
 
-exports[`state4.js 1`] = `
+exports[`state4.js-flow 1`] = `
 "var React = require('React');
 
 var C = React.createClass({
@@ -982,7 +982,7 @@ var C = React.createClass({
 "
 `;
 
-exports[`state5.js 1`] = `
+exports[`state5.js-flow 1`] = `
 "var React = require('React');
 
 class C extends React.Component {
diff --git a/tests/flow/new_react/fakelib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/new_react/fakelib/__snapshots__/jsfmt.spec.js.snap
index 5cd44b0bf..ed7aaf693 100644
--- a/tests/flow/new_react/fakelib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/new_react/fakelib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`type_aliases.js 1`] = `
+exports[`type_aliases.js-flow 1`] = `
 "declare var $React: $Exports<'react'>; // fake import
 // Strawman: revised definition of $jsx (alternatively, React.Element).
 // Using bounded poly to specify a constraint on a type parameter, and
diff --git a/tests/flow/node_haste/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_haste/__snapshots__/jsfmt.spec.js.snap
index 759c21638..a8a16ccf0 100644
--- a/tests/flow/node_haste/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_haste/__snapshots__/jsfmt.spec.js.snap
@@ -1,13 +1,13 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`client.js 1`] = `
+exports[`client.js-flow 1`] = `
 "var md5 = require('./md5');
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 var md5 = require(\\"./md5\\");
 "
 `;
 
-exports[`md5.js 1`] = `
+exports[`md5.js-flow 1`] = `
 "/* @providesModule md5 */
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 /* @providesModule md5 */
diff --git a/tests/flow/node_haste/external/_d3/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_haste/external/_d3/__snapshots__/jsfmt.spec.js.snap
index b11a700fa..c3ae14a18 100644
--- a/tests/flow/node_haste/external/_d3/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_haste/external/_d3/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`min.js 1`] = `
+exports[`min.js-flow 1`] = `
 "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 "
 `;
diff --git a/tests/flow/node_haste/foo/bar/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_haste/foo/bar/__snapshots__/jsfmt.spec.js.snap
index e8efa1c65..db81d290a 100644
--- a/tests/flow/node_haste/foo/bar/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_haste/foo/bar/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`client.js 1`] = `
+exports[`client.js-flow 1`] = `
 "var docblock = require('qux/docblock');
 var min = require('d3/min.js');
 var corge = require('qux/corge');
diff --git a/tests/flow/node_haste/ws/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_haste/ws/__snapshots__/jsfmt.spec.js.snap
index 3959b3ee8..42591c271 100644
--- a/tests/flow/node_haste/ws/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_haste/ws/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`index.js 1`] = `
+exports[`index.js-flow 1`] = `
 "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 "
 `;
diff --git a/tests/flow/node_haste/ws/test/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_haste/ws/test/__snapshots__/jsfmt.spec.js.snap
index 551421890..deb31ecd9 100644
--- a/tests/flow/node_haste/ws/test/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_haste/ws/test/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`client.js 1`] = `
+exports[`client.js-flow 1`] = `
 "var ws = require('../');
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 var ws = require(\\"../\\");
diff --git a/tests/flow/node_modules_with_symlinks/root/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_modules_with_symlinks/root/__snapshots__/jsfmt.spec.js.snap
index 3320a0505..eee3e8cad 100644
--- a/tests/flow/node_modules_with_symlinks/root/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_modules_with_symlinks/root/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "var x = require('symlink_lib');
 var y = require('symlink_lib_outside_root');
 console.log(x);
diff --git a/tests/flow/node_modules_with_symlinks/root/symlink_lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_modules_with_symlinks/root/symlink_lib/__snapshots__/jsfmt.spec.js.snap
index 78c3adac8..cfb809c93 100644
--- a/tests/flow/node_modules_with_symlinks/root/symlink_lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_modules_with_symlinks/root/symlink_lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`index.js 1`] = `
+exports[`index.js-flow 1`] = `
 "module.exports = { bar: \\"bar\\" };
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 module.exports = { bar: \\"bar\\" };
diff --git a/tests/flow/node_modules_with_symlinks/symlink_lib_outside_root/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_modules_with_symlinks/symlink_lib_outside_root/__snapshots__/jsfmt.spec.js.snap
index 78c3adac8..cfb809c93 100644
--- a/tests/flow/node_modules_with_symlinks/symlink_lib_outside_root/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_modules_with_symlinks/symlink_lib_outside_root/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`index.js 1`] = `
+exports[`index.js-flow 1`] = `
 "module.exports = { bar: \\"bar\\" };
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 module.exports = { bar: \\"bar\\" };
diff --git a/tests/flow/node_modules_without_json/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_modules_without_json/__snapshots__/jsfmt.spec.js.snap
index a58cb5f20..bee2f0fa7 100644
--- a/tests/flow/node_modules_without_json/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_modules_without_json/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "// @flow
 
 let foo = require('foo');
diff --git a/tests/flow/node_tests/assert/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/assert/__snapshots__/jsfmt.spec.js.snap
index 978f1d31a..1445b4e35 100644
--- a/tests/flow/node_tests/assert/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/assert/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`assert.js 1`] = `
+exports[`assert.js-flow 1`] = `
 "/* @flow */
 
 var assert = require(\\"assert\\")
diff --git a/tests/flow/node_tests/basic/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/basic/__snapshots__/jsfmt.spec.js.snap
index 536a7b06f..195997030 100644
--- a/tests/flow/node_tests/basic/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/basic/__snapshots__/jsfmt.spec.js.snap
@@ -1,13 +1,13 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`bar.js 1`] = `
+exports[`bar.js-flow 1`] = `
 "module.exports = \\"bar\\";
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 module.exports = \\"bar\\";
 "
 `;
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "var x = require('./bar.js');
 console.log(x);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/node_tests/basic_file/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/basic_file/__snapshots__/jsfmt.spec.js.snap
index 3852de7d4..4af513774 100644
--- a/tests/flow/node_tests/basic_file/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/basic_file/__snapshots__/jsfmt.spec.js.snap
@@ -1,13 +1,13 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`bar.js 1`] = `
+exports[`bar.js-flow 1`] = `
 "module.exports = \\"bar\\";
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 module.exports = \\"bar\\";
 "
 `;
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "var x = require('./bar'); // bar.js does not work
 console.log(x);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/node_tests/basic_node_modules/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/basic_node_modules/__snapshots__/jsfmt.spec.js.snap
index f761168d7..3323c5f05 100644
--- a/tests/flow/node_tests/basic_node_modules/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/basic_node_modules/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "var x = require('bar.js');
 console.log(x);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/node_tests/basic_node_modules_with_path/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/basic_node_modules_with_path/__snapshots__/jsfmt.spec.js.snap
index 4900c86d4..221088d5c 100644
--- a/tests/flow/node_tests/basic_node_modules_with_path/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/basic_node_modules_with_path/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "var x = require('bar_lib/bar');
 console.log(x);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/node_tests/basic_package/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/basic_package/__snapshots__/jsfmt.spec.js.snap
index 7bd83213b..928f26460 100644
--- a/tests/flow/node_tests/basic_package/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/basic_package/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "var x = require('./bar_lib'); // 'bar_lib' does not work!
 console.log(x);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/node_tests/basic_package/bar_lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/basic_package/bar_lib/__snapshots__/jsfmt.spec.js.snap
index e8f131d2f..0f62f08dd 100644
--- a/tests/flow/node_tests/basic_package/bar_lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/basic_package/bar_lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`bar.js 1`] = `
+exports[`bar.js-flow 1`] = `
 "module.exports = \\"bar\\";
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 module.exports = \\"bar\\";
diff --git a/tests/flow/node_tests/buffer/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/buffer/__snapshots__/jsfmt.spec.js.snap
index 6f408435e..7ad31cf7a 100644
--- a/tests/flow/node_tests/buffer/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/buffer/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`buffer.js 1`] = `
+exports[`buffer.js-flow 1`] = `
 "/* @flow */
 
 let bool: boolean = false;
diff --git a/tests/flow/node_tests/child_process/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/child_process/__snapshots__/jsfmt.spec.js.snap
index 965e74e9c..1f4a70713 100644
--- a/tests/flow/node_tests/child_process/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/child_process/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`exec.js 1`] = `
+exports[`exec.js-flow 1`] = `
 "/* @flow */
 
 var exec = require('child_process').exec;
@@ -37,7 +37,7 @@ exec(\\"ls\\", { maxBuffer: 100 }, function(error, stdout, stderr) {
 "
 `;
 
-exports[`execFile.js 1`] = `
+exports[`execFile.js-flow 1`] = `
 "/* @flow */
 
 var execFile = require('child_process').execFile;
@@ -96,7 +96,7 @@ execFile(\\"ls\\", [\\"-l\\"], { timeout: 250 }, function(error, stdout, stderr)
 "
 `;
 
-exports[`execSync.js 1`] = `
+exports[`execSync.js-flow 1`] = `
 "/* @flow */
 
 var execSync = require('child_process').execSync;
@@ -121,7 +121,7 @@ execSync(\\"ls\\", { stdio: [\\"inherit\\"] }); // error, no signatures match
 "
 `;
 
-exports[`spawn.js 1`] = `
+exports[`spawn.js-flow 1`] = `
 "/* @flow */
 
 var child_process = require('child_process');
diff --git a/tests/flow/node_tests/crypto/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/crypto/__snapshots__/jsfmt.spec.js.snap
index a08a576e1..56e9f65e3 100644
--- a/tests/flow/node_tests/crypto/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/crypto/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`crypto.js 1`] = `
+exports[`crypto.js-flow 1`] = `
 "/* @flow */
 
 const crypto = require('crypto');
diff --git a/tests/flow/node_tests/fs/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/fs/__snapshots__/jsfmt.spec.js.snap
index f200aa9d6..a57d40d76 100644
--- a/tests/flow/node_tests/fs/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/fs/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`fs.js 1`] = `
+exports[`fs.js-flow 1`] = `
 "var fs = require(\\"fs\\");
 
 /* readFile */
diff --git a/tests/flow/node_tests/json_file/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/json_file/__snapshots__/jsfmt.spec.js.snap
index 71e060189..c11b368ef 100644
--- a/tests/flow/node_tests/json_file/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/json_file/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "// @flow
 
 let data = require('./package/index.json');
diff --git a/tests/flow/node_tests/json_file/package2/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/json_file/package2/__snapshots__/jsfmt.spec.js.snap
index b7ae926b8..e997cfa91 100644
--- a/tests/flow/node_tests/json_file/package2/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/json_file/package2/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`index.js 1`] = `
+exports[`index.js-flow 1`] = `
 "// @flow
 
 module.exports = {
diff --git a/tests/flow/node_tests/os/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/os/__snapshots__/jsfmt.spec.js.snap
index db73cfcc6..7ce669ff5 100644
--- a/tests/flow/node_tests/os/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/os/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`userInfo.js 1`] = `
+exports[`userInfo.js-flow 1`] = `
 "/* @flow */
 
 var os = require('os');
diff --git a/tests/flow/node_tests/package_file/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/package_file/__snapshots__/jsfmt.spec.js.snap
index 93a7aa6e3..c8b007082 100644
--- a/tests/flow/node_tests/package_file/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/package_file/__snapshots__/jsfmt.spec.js.snap
@@ -1,13 +1,13 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`bar_lib.js 1`] = `
+exports[`bar_lib.js-flow 1`] = `
 "module.exports = \\"bar_lib\\";
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 module.exports = \\"bar_lib\\";
 "
 `;
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "var x: string = require('./bar_lib'); // 'bar_lib' does not work!
 console.log(x);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/node_tests/package_file/bar_lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/package_file/bar_lib/__snapshots__/jsfmt.spec.js.snap
index 35ab1a61b..4dc720dd6 100644
--- a/tests/flow/node_tests/package_file/bar_lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/package_file/bar_lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`bar.js 1`] = `
+exports[`bar.js-flow 1`] = `
 "module.exports = 0;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 module.exports = 0;
diff --git a/tests/flow/node_tests/package_file_node_modules/foo/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/package_file_node_modules/foo/__snapshots__/jsfmt.spec.js.snap
index 3715733f4..8fff0f175 100644
--- a/tests/flow/node_tests/package_file_node_modules/foo/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/package_file_node_modules/foo/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "var x: string = require('bar_lib'); // 'bar_lib' does not work!
 console.log(x);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/node_tests/path_node_modules/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/path_node_modules/__snapshots__/jsfmt.spec.js.snap
index 61bc8b8ec..b3adfcd67 100644
--- a/tests/flow/node_tests/path_node_modules/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/path_node_modules/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "var x = require('bar_lib/src/lib/bar');
 console.log(x);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/node_tests/path_node_modules_with_short_main/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/path_node_modules_with_short_main/__snapshots__/jsfmt.spec.js.snap
index a9c2f03c3..9d251c0ad 100644
--- a/tests/flow/node_tests/path_node_modules_with_short_main/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/path_node_modules_with_short_main/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "var x = require('bar_lib');
 console.log(x);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/node_tests/path_node_modules_without_main/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/path_node_modules_without_main/__snapshots__/jsfmt.spec.js.snap
index a9c2f03c3..9d251c0ad 100644
--- a/tests/flow/node_tests/path_node_modules_without_main/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/path_node_modules_without_main/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "var x = require('bar_lib');
 console.log(x);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/node_tests/path_package/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/path_package/__snapshots__/jsfmt.spec.js.snap
index 023ba873c..7fd8c5e7e 100644
--- a/tests/flow/node_tests/path_package/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/path_package/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "var x = require('bar_lib/src/lib');
 console.log(x);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/node_tests/stream/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/stream/__snapshots__/jsfmt.spec.js.snap
index 9fb02e3e7..c1b51de0f 100644
--- a/tests/flow/node_tests/stream/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/stream/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`stream.js 1`] = `
+exports[`stream.js-flow 1`] = `
 "/* @flow */
 
 var child_process = require('child_process');
diff --git a/tests/flow/node_tests/timers/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/timers/__snapshots__/jsfmt.spec.js.snap
index fdfad78c7..cf84e69ef 100644
--- a/tests/flow/node_tests/timers/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/timers/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`timers.js 1`] = `
+exports[`timers.js-flow 1`] = `
 "// @flow
 
 function setImmediateCallback(): number {
diff --git a/tests/flow/node_tests/url/__snapshots__/jsfmt.spec.js.snap b/tests/flow/node_tests/url/__snapshots__/jsfmt.spec.js.snap
index c9285b71a..079b71f16 100644
--- a/tests/flow/node_tests/url/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/node_tests/url/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`url.js 1`] = `
+exports[`url.js-flow 1`] = `
 "const url = require('url');
 url.format(url.parse('https://example.com/foo'));
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/nullable/__snapshots__/jsfmt.spec.js.snap b/tests/flow/nullable/__snapshots__/jsfmt.spec.js.snap
index f0aea86fc..67ced24ec 100644
--- a/tests/flow/nullable/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/nullable/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`maybe.js 1`] = `
+exports[`maybe.js-flow 1`] = `
 "// @flow
 
 // unwrapping nested maybes should work
@@ -15,7 +15,7 @@ exports[`maybe.js 1`] = `
 "
 `;
 
-exports[`nullable.js 1`] = `
+exports[`nullable.js-flow 1`] = `
 "function foo():string { return null; }
 
 function bar():?string { return null; }
@@ -63,7 +63,7 @@ var array_of_nullable: Array<?number> = [null, 3];
 "
 `;
 
-exports[`simple_nullable.js 1`] = `
+exports[`simple_nullable.js-flow 1`] = `
 "function foo(x:?string) {}
 function bar(x:?number) {}
 foo('hmm');
diff --git a/tests/flow/number_constants/__snapshots__/jsfmt.spec.js.snap b/tests/flow/number_constants/__snapshots__/jsfmt.spec.js.snap
index 295ad2ef4..b51fb2ee5 100644
--- a/tests/flow/number_constants/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/number_constants/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`number_constants.js 1`] = `
+exports[`number_constants.js-flow 1`] = `
 "var a: number = Number.MAX_SAFE_INTEGER;
 var b: string = Number.MAX_SAFE_INTEGER;
 var c: number = Number.MIN_SAFE_INTEGER;
diff --git a/tests/flow/object-method/__snapshots__/jsfmt.spec.js.snap b/tests/flow/object-method/__snapshots__/jsfmt.spec.js.snap
index 5d1dad11a..e0289b017 100644
--- a/tests/flow/object-method/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/object-method/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`id.js 1`] = `
+exports[`id.js-flow 1`] = `
 "declare function id<X>(_: X): X;
 
 module.exports = id;
@@ -11,7 +11,7 @@ module.exports = id;
 "
 `;
 
-exports[`subtype.js 1`] = `
+exports[`subtype.js-flow 1`] = `
 "interface Interface {
   m(): void;
 }
@@ -30,7 +30,7 @@ function subtypeCheck(x: Interface): ObjectType {
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "const id = require('./id');
 
 export type ObjectType = {
@@ -59,7 +59,7 @@ module.exports = id(methodCaller);
 "
 `;
 
-exports[`test2.js 1`] = `
+exports[`test2.js-flow 1`] = `
 "/* @flow */
 
 function f() {
@@ -98,7 +98,7 @@ b.f(); // error, property \`p\` not found
 "
 `;
 
-exports[`test3.js 1`] = `
+exports[`test3.js-flow 1`] = `
 "/* @flow */
 
 function foo() {
diff --git a/tests/flow/object_annot/__snapshots__/jsfmt.spec.js.snap b/tests/flow/object_annot/__snapshots__/jsfmt.spec.js.snap
index 124de1878..63d0d07b2 100644
--- a/tests/flow/object_annot/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/object_annot/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "function foo(x: Array<Object>): Array<Object> {
     return x.sort((a, b) => a.foo - b.foo);
 }
diff --git a/tests/flow/object_api/__snapshots__/jsfmt.spec.js.snap b/tests/flow/object_api/__snapshots__/jsfmt.spec.js.snap
index cf569e87f..866949f2f 100644
--- a/tests/flow/object_api/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/object_api/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`a.js 1`] = `
+exports[`a.js-flow 1`] = `
 "/* @flow */
 
 module.exports = { a() {} };~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -10,7 +10,7 @@ module.exports = { a() {} };
 "
 `;
 
-exports[`b.js 1`] = `
+exports[`b.js-flow 1`] = `
 "/* @flow */
 
 var a = require('./a');
@@ -27,7 +27,7 @@ module.exports = b;
 "
 `;
 
-exports[`c.js 1`] = `
+exports[`c.js-flow 1`] = `
 "/* @flow */
 
 var c = require('./b');
@@ -41,7 +41,7 @@ c.foo();
 "
 `;
 
-exports[`object_assign.js 1`] = `
+exports[`object_assign.js-flow 1`] = `
 "/* @flow */
 
 var export_ = Object.assign({}, {
@@ -75,7 +75,7 @@ module.exports = export_;
 "
 `;
 
-exports[`object_create.js 1`] = `
+exports[`object_create.js-flow 1`] = `
 "/* @flow */
 
 class C { foo: string; }
@@ -116,7 +116,7 @@ declare var o: O;
 "
 `;
 
-exports[`object_getprototypeof.js 1`] = `
+exports[`object_getprototypeof.js-flow 1`] = `
 "// @flow
 
 class Foo {}
@@ -143,7 +143,7 @@ let tests = [
 "
 `;
 
-exports[`object_keys.js 1`] = `
+exports[`object_keys.js-flow 1`] = `
 "/* @flow */
 
 var sealed = {one: 'one', two: 'two'};
@@ -212,7 +212,7 @@ class Bar extends Foo {
 "
 `;
 
-exports[`object_missing.js 1`] = `
+exports[`object_missing.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -231,7 +231,7 @@ let tests = [
 "
 `;
 
-exports[`object_prototype.js 1`] = `
+exports[`object_prototype.js-flow 1`] = `
 "/* @flow */
 
 function takesABool(x: boolean) {}
diff --git a/tests/flow/object_assign/__snapshots__/jsfmt.spec.js.snap b/tests/flow/object_assign/__snapshots__/jsfmt.spec.js.snap
index d011c3c8a..16807caee 100644
--- a/tests/flow/object_assign/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/object_assign/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -61,7 +61,7 @@ module.exports = {
 "
 `;
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -100,7 +100,7 @@ A.js|8 col 23 error|  object literal
 "
 `;
 
-exports[`apply.js 1`] = `
+exports[`apply.js-flow 1`] = `
 "// @flow
 
 (Object.assign.apply(null, [{}, {a: 1}, {b: 'foo'}]): {a: number, b: string});
@@ -116,7 +116,7 @@ exports[`apply.js 1`] = `
 "
 `;
 
-exports[`non_objects.js 1`] = `
+exports[`non_objects.js-flow 1`] = `
 "/* @flow */
 
 Object.assign(\\"123\\", {a: \\"foo\\"});
@@ -131,7 +131,7 @@ Object.assign({ a: \\"foo\\" }, 123);
 "
 `;
 
-exports[`undefined.js 1`] = `
+exports[`undefined.js-flow 1`] = `
 "/* @flow */
 
 var React = require('react');
diff --git a/tests/flow/object_freeze/__snapshots__/jsfmt.spec.js.snap b/tests/flow/object_freeze/__snapshots__/jsfmt.spec.js.snap
index 1994cb924..d65754b16 100644
--- a/tests/flow/object_freeze/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/object_freeze/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`object_freeze.js 1`] = `
+exports[`object_freeze.js-flow 1`] = `
 "/* @flow */
 
 var foo = Object.freeze({bar: '12345'});
diff --git a/tests/flow/object_is/__snapshots__/jsfmt.spec.js.snap b/tests/flow/object_is/__snapshots__/jsfmt.spec.js.snap
index bbb4af7e1..a3233d6c3 100644
--- a/tests/flow/object_is/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/object_is/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`object_is.js 1`] = `
+exports[`object_is.js-flow 1`] = `
 "Object.is(1, 1);
 Object.is(1, 2);
 Object.is(1, {});
diff --git a/tests/flow/objects/__snapshots__/jsfmt.spec.js.snap b/tests/flow/objects/__snapshots__/jsfmt.spec.js.snap
index dfdbf1d99..f07d9a310 100644
--- a/tests/flow/objects/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/objects/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`conversion.js 1`] = `
+exports[`conversion.js-flow 1`] = `
 "/* @flow */
 
 (Object({foo: 'bar'}): {foo: string});
@@ -43,7 +43,7 @@ var z = Object(123); // error (next line makes this not match any signatures)
 "
 `;
 
-exports[`objects.js 1`] = `
+exports[`objects.js-flow 1`] = `
 "/* @flow */
 
 var x : {'123': string, bar: string} = {'123': 'val', bar: 'bar'};
@@ -84,7 +84,7 @@ y[\\"bar\\"] = \\"abc\\"; // error, property not found
 "
 `;
 
-exports[`unaliased_assign.js 1`] = `
+exports[`unaliased_assign.js-flow 1`] = `
 "/**
  * test handling of unaliased value assignment.
  *
diff --git a/tests/flow/objmap/__snapshots__/jsfmt.spec.js.snap b/tests/flow/objmap/__snapshots__/jsfmt.spec.js.snap
index c1720fda5..00c7385ca 100644
--- a/tests/flow/objmap/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/objmap/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`objmap.js 1`] = `
+exports[`objmap.js-flow 1`] = `
 "declare function promiseAllByKey<O>(o: O): Promise<$ObjMap<O,typeof $await>>;
 declare function keyMirror<O>(o: O): $ObjMapi<O, <K>(k:K) => K>;
 
diff --git a/tests/flow/optional/__snapshots__/jsfmt.spec.js.snap b/tests/flow/optional/__snapshots__/jsfmt.spec.js.snap
index 7c1df7b85..20106fefa 100644
--- a/tests/flow/optional/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/optional/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`client_optional.js 1`] = `
+exports[`client_optional.js-flow 1`] = `
 "var qux = require('./optional');
 
 qux(0);
@@ -11,7 +11,7 @@ qux(0);
 "
 `;
 
-exports[`default.js 1`] = `
+exports[`default.js-flow 1`] = `
 "function f<T>(foo, bar = foo): [T, T] {
   return [foo, bar];
 }
@@ -22,7 +22,7 @@ function f<T>(foo, bar = foo): [T, T] {
 "
 `;
 
-exports[`generic.js 1`] = `
+exports[`generic.js-flow 1`] = `
 "function x<T>(x: T = 0) {}
 
 class C {
@@ -37,7 +37,7 @@ class C {
 "
 `;
 
-exports[`maybe.js 1`] = `
+exports[`maybe.js-flow 1`] = `
 "function foo(x?: string): ?string {
     return x;
 }
@@ -48,7 +48,7 @@ function foo(x?: string): ?string {
 "
 `;
 
-exports[`nullable.js 1`] = `
+exports[`nullable.js-flow 1`] = `
 "/* @flow */
 
 function optionalNullable1(x: {y?: ?number}) {
@@ -151,7 +151,7 @@ function optionalNullable8(x: { y?: ?number }) {
 "
 `;
 
-exports[`optional.js 1`] = `
+exports[`optional.js-flow 1`] = `
 "function bar(x?,y?) { x * 0; }
 bar(0);
 
@@ -185,7 +185,7 @@ module.exports = qux;
 "
 `;
 
-exports[`optional_param.js 1`] = `
+exports[`optional_param.js-flow 1`] = `
 "/* @flow */
 function foo(x?: string): string {
     if (x == null) { return 'foo'; }
@@ -272,7 +272,7 @@ function testOptionalNullableFlowingToNullable(x?: ?string): ?string {
 "
 `;
 
-exports[`optional_param2.js 1`] = `
+exports[`optional_param2.js-flow 1`] = `
 "declare class I<V> {
     map<M>(
         mapper: (value?: V) => M
@@ -289,7 +289,7 @@ var j: I<number> = i.map(id => id);
 "
 `;
 
-exports[`optional_param3.js 1`] = `
+exports[`optional_param3.js-flow 1`] = `
 "function foo(x?: number) {}
 foo(undefined); // ok
 
@@ -308,7 +308,7 @@ bar(undefined); // ok
 "
 `;
 
-exports[`optional_param4.js 1`] = `
+exports[`optional_param4.js-flow 1`] = `
 "/* @flow */
 
 function foo(x?: number, ...y: Array<string>): [?number, Array<string>] {
@@ -337,7 +337,7 @@ foo(123, true); // ERROR boolean ~> string
 "
 `;
 
-exports[`undefined.js 1`] = `
+exports[`undefined.js-flow 1`] = `
 "var x;
 
 function foo(bar? = undefined) {
@@ -360,7 +360,7 @@ function bar() {
 "
 `;
 
-exports[`undefined2.js 1`] = `
+exports[`undefined2.js-flow 1`] = `
 "var x;
 
 function foo(bar?) {
diff --git a/tests/flow/optional_props/__snapshots__/jsfmt.spec.js.snap b/tests/flow/optional_props/__snapshots__/jsfmt.spec.js.snap
index 7b95834ab..705919ad5 100644
--- a/tests/flow/optional_props/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/optional_props/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "var x: { } = { foo: 0 };
 var y: { foo?: string } = x; // OK in TypeScript, not OK in Flow
 
@@ -29,7 +29,7 @@ bar({ foo: \\"\\" });
 "
 `;
 
-exports[`test2.js 1`] = `
+exports[`test2.js-flow 1`] = `
 "var a: { foo?: string } = {};
 a.foo = undefined; // This is not an error
 a.foo = null; // But this is an error
@@ -60,7 +60,7 @@ var f: { foo?: ?string } = { foo: null }; // Also fine
 "
 `;
 
-exports[`test3.js 1`] = `
+exports[`test3.js-flow 1`] = `
 "// @flow
 
 /*
@@ -177,7 +177,7 @@ class A {
 "
 `;
 
-exports[`test3_failure.js 1`] = `
+exports[`test3_failure.js-flow 1`] = `
 "// generalization of failure in test3.js
 
 class A<O: {x: { a: number, b?: string}}> {
diff --git a/tests/flow/overload/__snapshots__/jsfmt.spec.js.snap b/tests/flow/overload/__snapshots__/jsfmt.spec.js.snap
index 813dfaaea..ecbc53cf4 100644
--- a/tests/flow/overload/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/overload/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`overload.js 1`] = `
+exports[`overload.js-flow 1`] = `
 "/**
  * tests of overload selection
  *
@@ -107,7 +107,7 @@ var z2:Array<string> = new Dummy().dumber(bar2);
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "function foo() {
   var output = new FakeUint8Array();
   output.set(new FakeUint8Array(), 0); // matches one of the overloads of set
@@ -120,7 +120,7 @@ function foo() {
 "
 `;
 
-exports[`test2.js 1`] = `
+exports[`test2.js-flow 1`] = `
 "declare class Foo {
   bar(x: 'hmm'): number;
   bar(x: string): string;
@@ -139,7 +139,7 @@ var foo = new Foo();
 "
 `;
 
-exports[`test3.js 1`] = `
+exports[`test3.js-flow 1`] = `
 "// passing a union-like thing into an overload is ok
 // if overload handles each branch of union-like thing
 
@@ -186,7 +186,7 @@ h(x_h.p); // ok
 "
 `;
 
-exports[`union.js 1`] = `
+exports[`union.js-flow 1`] = `
 "function foo<U> (x: $Either<Array<U>,U>): Array<U> { return []; }
 
 var x1:number = foo(0)[0];
diff --git a/tests/flow/overload/lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/overload/lib/__snapshots__/jsfmt.spec.js.snap
index a4b3da9fb..1284e0ff7 100644
--- a/tests/flow/overload/lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/overload/lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`lib.js 1`] = `
+exports[`lib.js-flow 1`] = `
 "declare class FakeUint8Array {
   set(index: number, value: number): void;
   set(array: FakeUint8Array | Array<number>, offset?: number): void;
diff --git a/tests/flow/parse/__snapshots__/jsfmt.spec.js.snap b/tests/flow/parse/__snapshots__/jsfmt.spec.js.snap
index 9132e2aca..9faf5e5b3 100644
--- a/tests/flow/parse/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/parse/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`no_parse_error.js 1`] = `
+exports[`no_parse_error.js-flow 1`] = `
 "/*
 @flow
 */
diff --git a/tests/flow/parse_error_haste/__snapshots__/jsfmt.spec.js.snap b/tests/flow/parse_error_haste/__snapshots__/jsfmt.spec.js.snap
index c29fce308..edd714109 100644
--- a/tests/flow/parse_error_haste/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/parse_error_haste/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Client.js 1`] = `
+exports[`Client.js-flow 1`] = `
 "/**
  * Client imports some but not all modules,
  * triggering/suppressing parse errors.
diff --git a/tests/flow/parse_error_node/__snapshots__/jsfmt.spec.js.snap b/tests/flow/parse_error_node/__snapshots__/jsfmt.spec.js.snap
index 794d5d41e..c1acd8fce 100644
--- a/tests/flow/parse_error_node/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/parse_error_node/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Client.js 1`] = `
+exports[`Client.js-flow 1`] = `
 "/**
  * Client imports some but not all modules,
  * triggering/suppressing parse errors.
diff --git a/tests/flow/path/__snapshots__/jsfmt.spec.js.snap b/tests/flow/path/__snapshots__/jsfmt.spec.js.snap
index 967267362..f244ce2a0 100644
--- a/tests/flow/path/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/path/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`while.js 1`] = `
+exports[`while.js-flow 1`] = `
 "var x = 1;
 while(typeof x == \\"number\\" || typeof x == \\"string\\") {
     x = x + 1;
diff --git a/tests/flow/plsummit/__snapshots__/jsfmt.spec.js.snap b/tests/flow/plsummit/__snapshots__/jsfmt.spec.js.snap
index 5c941a0ac..92ab408d0 100644
--- a/tests/flow/plsummit/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/plsummit/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`arrays.js 1`] = `
+exports[`arrays.js-flow 1`] = `
 "function foo(x) { return [x, x > 0, \\"number \\" + x]; }
 
 var [n, b, s] = foo(42);
@@ -15,7 +15,7 @@ n * s.length;
 "
 `;
 
-exports[`export_class.js 1`] = `
+exports[`export_class.js-flow 1`] = `
 "class C {
     x: number;
     constructor(x: number) { this.x = x; }
@@ -34,7 +34,7 @@ module.exports = C;
 "
 `;
 
-exports[`generics.js 1`] = `
+exports[`generics.js-flow 1`] = `
 "/* @flow */
 
 var r: number = 0;
@@ -50,7 +50,7 @@ function foo<X>(x: X): X {
 "
 `;
 
-exports[`import_class.js 1`] = `
+exports[`import_class.js-flow 1`] = `
 "var C = require('./export_class');
 
 var c = new C(\\"\\");
@@ -61,7 +61,7 @@ var c = new C(\\"\\");
 "
 `;
 
-exports[`locals.js 1`] = `
+exports[`locals.js-flow 1`] = `
 "/* @flow */
 
 function foo() {
@@ -88,7 +88,7 @@ function bar(x: ?string): number {
 "
 `;
 
-exports[`objects.js 1`] = `
+exports[`objects.js-flow 1`] = `
 "function C() { this.x = 0; }
 C.prototype.foo = function() { return this.x; }
 
diff --git a/tests/flow/poly/__snapshots__/jsfmt.spec.js.snap b/tests/flow/poly/__snapshots__/jsfmt.spec.js.snap
index 48d7a7075..6e383b52d 100644
--- a/tests/flow/poly/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/poly/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`annot.js 1`] = `
+exports[`annot.js-flow 1`] = `
 "class A<X> { }
 new A; // OK, implicitly inferred type args
 class B extends A { } // OK, same as above
@@ -29,7 +29,7 @@ function bar(): A<*> {
 "
 `;
 
-exports[`implicit_bounded_instantiation.js 1`] = `
+exports[`implicit_bounded_instantiation.js-flow 1`] = `
 "// @flow
 
 class Base {}
@@ -74,7 +74,7 @@ a.meth(new Base()); // Error: Base ~> Middle
 "
 `;
 
-exports[`issue-1029.js 1`] = `
+exports[`issue-1029.js-flow 1`] = `
 "// @flow
 
 // naive unification causes combinatorial explosion here,
@@ -115,7 +115,7 @@ unbox(bool);
 "
 `;
 
-exports[`poly.js 1`] = `
+exports[`poly.js-flow 1`] = `
 "class Foo<T> {
     x:T;
     constructor(x:T) { this.x = x; }
@@ -160,7 +160,7 @@ var z: Foo<number> = Q.bar(foo, \\"\\");
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "class C {
   foo<X>(x: X): X { return x; }
   foo_<X: number>(x: X): number { return x; }
diff --git a/tests/flow/poly_class_export/__snapshots__/jsfmt.spec.js.snap b/tests/flow/poly_class_export/__snapshots__/jsfmt.spec.js.snap
index db73d5173..fe9cc9bec 100644
--- a/tests/flow/poly_class_export/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/poly_class_export/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "// @flow
 
 class A<T> {
@@ -19,7 +19,7 @@ module.exports = A;
 "
 `;
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "// @flow
 
 let A = require('./A');
@@ -46,7 +46,7 @@ module.exports = new B();
 "
 `;
 
-exports[`C.js 1`] = `
+exports[`C.js-flow 1`] = `
 "// @flow
 
 // This test exports a function whose return type is the class's \`this\` type.
diff --git a/tests/flow/poly_overload/decls/__snapshots__/jsfmt.spec.js.snap b/tests/flow/poly_overload/decls/__snapshots__/jsfmt.spec.js.snap
index 84559bd92..be4a08f3f 100644
--- a/tests/flow/poly_overload/decls/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/poly_overload/decls/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`typescript-deferred.js 1`] = `
+exports[`typescript-deferred.js-flow 1`] = `
 "interface Some<X> {}
 interface Other<X> { x: X; }
 interface None<Y> {}
diff --git a/tests/flow/predicates-abstract/__snapshots__/jsfmt.spec.js.snap b/tests/flow/predicates-abstract/__snapshots__/jsfmt.spec.js.snap
index 80832bdb6..09b86058d 100644
--- a/tests/flow/predicates-abstract/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/predicates-abstract/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`filter.js 1`] = `
+exports[`filter.js-flow 1`] = `
 "// @flow
 
 // Filter the contents of an array
@@ -34,7 +34,7 @@ function is_string(x): %checks {
 "
 `;
 
-exports[`filter-union.js 1`] = `
+exports[`filter-union.js-flow 1`] = `
 "// @flow
 
 // Filter the contents of an array
@@ -75,7 +75,7 @@ declare var ab: Array<A | B | C>;
 "
 `;
 
-exports[`refine.js 1`] = `
+exports[`refine.js-flow 1`] = `
 "// @flow
 
 /*
@@ -175,7 +175,7 @@ function is_string_and_number(x, y): %checks {
 "
 `;
 
-exports[`sanity-filter.js 1`] = `
+exports[`sanity-filter.js-flow 1`] = `
 "// @flow
 
 declare function my_filter<T, P: $Pred<1>>(v: Array<T>, cb: P): Array<$Refine<T,P,1>>;
@@ -226,7 +226,7 @@ function is_string_regular(x): boolean {
 "
 `;
 
-exports[`sanity-filter-union.js 1`] = `
+exports[`sanity-filter-union.js-flow 1`] = `
 "// @flow
 
 // Filter the contents of an array
@@ -267,7 +267,7 @@ declare var ab: Array<A | B | C>;
 "
 `;
 
-exports[`sanity-refine.js 1`] = `
+exports[`sanity-refine.js-flow 1`] = `
 "// @flow
 
 // Sanity check A: the refinment position index is outside of the allowed range
diff --git a/tests/flow/predicates-declared/__snapshots__/jsfmt.spec.js.snap b/tests/flow/predicates-declared/__snapshots__/jsfmt.spec.js.snap
index 50dc606cd..b06aa9c53 100644
--- a/tests/flow/predicates-declared/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/predicates-declared/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`function-bind.js 1`] = `
+exports[`function-bind.js-flow 1`] = `
 "// @flow
 
 // Sanity checks:
@@ -86,7 +86,7 @@ if (m.bind(this)(x)) {
 "
 `;
 
-exports[`function-union.js 1`] = `
+exports[`function-union.js-flow 1`] = `
 "// @flow
 
 declare function f1(x: mixed): boolean %checks(typeof x === \\"string\\");
@@ -126,7 +126,7 @@ function foo(x: number | string | Array<string>): number {
 "
 `;
 
-exports[`is-string-decl.js 1`] = `
+exports[`is-string-decl.js-flow 1`] = `
 "// @flow
 
 declare function is_string(x: mixed): boolean %checks(typeof x === \\"string\\");
@@ -167,7 +167,7 @@ function foo(x: string | Array<string>): string {
 "
 `;
 
-exports[`logical-or.js 1`] = `
+exports[`logical-or.js-flow 1`] = `
 "// @flow
 
 // Sanity check:
@@ -218,7 +218,7 @@ Number(dollars) || 0;
 "
 `;
 
-exports[`object-invariant.js 1`] = `
+exports[`object-invariant.js-flow 1`] = `
 "// @flow
 
 // Sanity check:
@@ -270,7 +270,7 @@ function f(_this: { m: ?Meeting }): string {
 "
 `;
 
-exports[`orig-string-tag-check.js 1`] = `
+exports[`orig-string-tag-check.js-flow 1`] = `
 "// @flow
 
 // The original first-order case
@@ -298,7 +298,7 @@ function foo(x: string | Array<string>): string {
 "
 `;
 
-exports[`sanity-fall-through.js 1`] = `
+exports[`sanity-fall-through.js-flow 1`] = `
 "// @flow
 
 // Sanity check:
@@ -329,7 +329,7 @@ function foo(s: Array<string>): string {
 "
 `;
 
-exports[`sanity-invalid-calls.js 1`] = `
+exports[`sanity-invalid-calls.js-flow 1`] = `
 "// @flow
 
 // Sanity check:
@@ -371,7 +371,7 @@ function foo(s: Array<string>): string {
 "
 `;
 
-exports[`sanity-is-string-bug.js 1`] = `
+exports[`sanity-is-string-bug.js-flow 1`] = `
 "// @flow
 
 declare function is_string(x: mixed): boolean %checks(typeof x === \\"string\\");
@@ -406,7 +406,7 @@ function bar(x: string | Array<string>): string {
 "
 `;
 
-exports[`sanity-parameter-mismatch.js 1`] = `
+exports[`sanity-parameter-mismatch.js-flow 1`] = `
 "// @flow
 
 // Sanity check: make sure the parameters are checked as usual
@@ -431,7 +431,7 @@ foo(3, 3);
 "
 `;
 
-exports[`sanity-pred-with-body.js 1`] = `
+exports[`sanity-pred-with-body.js-flow 1`] = `
 "// @flow
 
 // Sanity check:
@@ -467,7 +467,7 @@ function foo(x: string | Array<string>): string {
 "
 `;
 
-exports[`sanity-return-type.js 1`] = `
+exports[`sanity-return-type.js-flow 1`] = `
 "// @flow
 
 declare function f2(x: mixed): string %checks(Array.isArray(x));
diff --git a/tests/flow/predicates-inferred/__snapshots__/jsfmt.spec.js.snap b/tests/flow/predicates-inferred/__snapshots__/jsfmt.spec.js.snap
index 1bc595ec6..2463b319e 100644
--- a/tests/flow/predicates-inferred/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/predicates-inferred/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`sanity.js 1`] = `
+exports[`sanity.js-flow 1`] = `
 "// @flow
 
 // Sanity check: shouldn't be allowed to declare a predicate AND use \`chekcs\`
@@ -59,7 +59,7 @@ function bak(z: string | number): number {
 "
 `;
 
-exports[`sanity-multi-params.js 1`] = `
+exports[`sanity-multi-params.js-flow 1`] = `
 "// @flow
 
 // Feature: multi params
@@ -92,7 +92,7 @@ function foo(x: string | Array<string>): string {
 "
 `;
 
-exports[`sanity-ordering.js 1`] = `
+exports[`sanity-ordering.js-flow 1`] = `
 "// @flow
 
 declare var key: string;
@@ -133,7 +133,7 @@ function dotAccess(head, create) {
 "
 `;
 
-exports[`sanity-unbound-var.js 1`] = `
+exports[`sanity-unbound-var.js-flow 1`] = `
 "// @flow
 
 declare var y: mixed;
@@ -172,7 +172,7 @@ function foo(x: string | Array<string>): string {
 "
 `;
 
-exports[`simple-predicate-func.js 1`] = `
+exports[`simple-predicate-func.js-flow 1`] = `
 "// @flow
 
 function is_string(y): %checks {
@@ -323,7 +323,7 @@ declare function from_two_strings(x: string, y: string): void;
 "
 `;
 
-exports[`simple-predicate-func-post.js 1`] = `
+exports[`simple-predicate-func-post.js-flow 1`] = `
 "// @flow
 
 // Feature check:
diff --git a/tests/flow/predicates-parsing/__snapshots__/jsfmt.spec.js.snap b/tests/flow/predicates-parsing/__snapshots__/jsfmt.spec.js.snap
index c8c934b2a..72ec99477 100644
--- a/tests/flow/predicates-parsing/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/predicates-parsing/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`fail-0.js 1`] = `
+exports[`fail-0.js-flow 1`] = `
 "// @flow
 
 // Error: 'declare', 'checks' but missing predicate
@@ -15,7 +15,7 @@ declare function f2(x: mixed): boolean %checks;
 "
 `;
 
-exports[`fail-1.js 1`] = `
+exports[`fail-1.js-flow 1`] = `
 "// @flow
 
 // Error: no return statement
@@ -30,7 +30,7 @@ function f6(x: mixed): %checks(x !== null) {}
 "
 `;
 
-exports[`fail-2.js 1`] = `
+exports[`fail-2.js-flow 1`] = `
 "// @flow
 
 var a2 = (x: mixed): %checks (x !== null) => {        // Error: body form
@@ -47,7 +47,7 @@ var a2 = (x: mixed): %checks(x !== null) => {
 "
 `;
 
-exports[`fail-3.js 1`] = `
+exports[`fail-3.js-flow 1`] = `
 "// @flow
 
 // Cannot declare predicate with a function body is present.
@@ -68,7 +68,7 @@ var a2 = (x: mixed): %checks(x !== null) => x !== null;
 "
 `;
 
-exports[`pass.js 1`] = `
+exports[`pass.js-flow 1`] = `
 "// @flow
 
 declare function f1(x: mixed): boolean;
diff --git a/tests/flow/private/__snapshots__/jsfmt.spec.js.snap b/tests/flow/private/__snapshots__/jsfmt.spec.js.snap
index 363cb23b2..951836b4c 100644
--- a/tests/flow/private/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/private/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`private.js 1`] = `
+exports[`private.js-flow 1`] = `
 "class A {
   x: number;
   _x: string;
diff --git a/tests/flow/promises/__snapshots__/jsfmt.spec.js.snap b/tests/flow/promises/__snapshots__/jsfmt.spec.js.snap
index f2d5f1915..a08e6ad36 100644
--- a/tests/flow/promises/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/promises/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`all.js 1`] = `
+exports[`all.js-flow 1`] = `
 "// @flow
 
 declare var pstr: Promise<string>;
@@ -83,7 +83,7 @@ function tes2(val: Map<string, Promise<number>>) {
 "
 `;
 
-exports[`covariance.js 1`] = `
+exports[`covariance.js-flow 1`] = `
 "/* @flow */
 
 async function testAll() {
@@ -120,7 +120,7 @@ async function testRace() {
 "
 `;
 
-exports[`promise.js 1`] = `
+exports[`promise.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -598,7 +598,7 @@ Promise.resolve(0).catch(function(err) {}).then(function(num) {
 "
 `;
 
-exports[`resolve_global.js 1`] = `
+exports[`resolve_global.js-flow 1`] = `
 "/**
  * test Promise name resolution
  * @flow
@@ -685,7 +685,7 @@ async function baz(): Promise<number> {
 "
 `;
 
-exports[`resolve_void.js 1`] = `
+exports[`resolve_void.js-flow 1`] = `
 "// @flow
 
 (Promise.resolve(): Promise<number>); // error
diff --git a/tests/flow/pure_component/__snapshots__/jsfmt.spec.js.snap b/tests/flow/pure_component/__snapshots__/jsfmt.spec.js.snap
index cbf8baad6..a92fa0e82 100644
--- a/tests/flow/pure_component/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/pure_component/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "var React = require('react');
 
 class C extends React.PureComponent {
diff --git a/tests/flow/qualified/__snapshots__/jsfmt.spec.js.snap b/tests/flow/qualified/__snapshots__/jsfmt.spec.js.snap
index 78ab0f044..1a5cc4eb3 100644
--- a/tests/flow/qualified/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/qualified/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`qualified.js 1`] = `
+exports[`qualified.js-flow 1`] = `
 "class C { }
 var M = { C: C };
 
diff --git a/tests/flow/react/__snapshots__/jsfmt.spec.js.snap b/tests/flow/react/__snapshots__/jsfmt.spec.js.snap
index 5cbf44da0..75e0b808d 100644
--- a/tests/flow/react/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/react/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`ArityError.react.js 1`] = `
+exports[`ArityError.react.js-flow 1`] = `
 "/**
  * @providesModule ArityError.react
  */
@@ -27,7 +27,7 @@ module.exports = AudienceInsightsContainer;
 "
 `;
 
-exports[`createElement_string.js 1`] = `
+exports[`createElement_string.js-flow 1`] = `
 "// @flow
 import React from 'react';
 
@@ -54,7 +54,7 @@ class Foo extends React.Component {
 "
 `;
 
-exports[`createElementRequiredProp_string.js 1`] = `
+exports[`createElementRequiredProp_string.js-flow 1`] = `
 "// @flow
 import React from 'react';
 
@@ -103,7 +103,7 @@ class Foo extends React.Component {
 "
 `;
 
-exports[`import_react.js 1`] = `
+exports[`import_react.js-flow 1`] = `
 "/* @flow */
 
 import react from \\"react\\";
@@ -122,7 +122,7 @@ var b: number = new react.Component(); // Error: ReactComponent ~> number
 "
 `;
 
-exports[`jsx_spread.js 1`] = `
+exports[`jsx_spread.js-flow 1`] = `
 "/* @flow */
 
 var React = require('react');
@@ -149,7 +149,7 @@ var blah = <Foo {...props} />; // error bar, number given string expected
 "
 `;
 
-exports[`proptype_arrayOf.js 1`] = `
+exports[`proptype_arrayOf.js-flow 1`] = `
 "/* @flow */
 
 var React = require('react');
@@ -182,7 +182,7 @@ var fail_mistyped_elems = <Example arr={[1, \\"foo\\"]} />;
 "
 `;
 
-exports[`proptype_func.js 1`] = `
+exports[`proptype_func.js-flow 1`] = `
 "/* @flow */
 
 var React = require('react');
@@ -215,7 +215,7 @@ var fail_mistyped = <Example func={2} />;
 "
 `;
 
-exports[`proptype_missing.js 1`] = `
+exports[`proptype_missing.js-flow 1`] = `
 "/* @flow */
 
 /* If you create a react component with createClass() but don't specify the
@@ -282,7 +282,7 @@ var React = React.createClass({
 "
 `;
 
-exports[`proptype_object.js 1`] = `
+exports[`proptype_object.js-flow 1`] = `
 "/* @flow */
 
 var React = require('react');
@@ -313,7 +313,7 @@ var fail_mistyped = <Example object={2} />;
 "
 `;
 
-exports[`proptype_objectOf.js 1`] = `
+exports[`proptype_objectOf.js-flow 1`] = `
 "/* @flow */
 
 var React = require('react');
@@ -346,7 +346,7 @@ var fail_mistyped_props = <Example obj={{ foo: \\"foo\\" }} />;
 "
 `;
 
-exports[`proptype_oneOf.js 1`] = `
+exports[`proptype_oneOf.js-flow 1`] = `
 "/* @flow */
 
 var React = require('react');
@@ -373,7 +373,7 @@ var ex2 = <Example literal=\\"bar\\" />;
 "
 `;
 
-exports[`proptype_oneOfType.js 1`] = `
+exports[`proptype_oneOfType.js-flow 1`] = `
 "/* @flow */
 
 var React = require('react');
diff --git a/tests/flow/react_functional/__snapshots__/jsfmt.spec.js.snap b/tests/flow/react_functional/__snapshots__/jsfmt.spec.js.snap
index 6511f9e81..13484c8fd 100644
--- a/tests/flow/react_functional/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/react_functional/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "import React from \\"react\\";
 
 function F(props: { foo: string }) {}
diff --git a/tests/flow/react_modules/__snapshots__/jsfmt.spec.js.snap b/tests/flow/react_modules/__snapshots__/jsfmt.spec.js.snap
index de9496c13..eb28b3b15 100644
--- a/tests/flow/react_modules/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/react_modules/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`createclass-callsite.js 1`] = `
+exports[`createclass-callsite.js-flow 1`] = `
 "/* @flow */
 var React = require('react');
 var Hello = require('./createclass-module');
@@ -57,7 +57,7 @@ module.exports = Callsite;
 "
 `;
 
-exports[`createclass-module.js 1`] = `
+exports[`createclass-module.js-flow 1`] = `
 "/* @flow */
 var React = require('react');
 
@@ -90,7 +90,7 @@ module.exports = Hello;
 "
 `;
 
-exports[`es6class-types-callsite.js 1`] = `
+exports[`es6class-types-callsite.js-flow 1`] = `
 "/* @flow */
 import React from 'react';
 import Hello from './es6class-types-module';
@@ -147,7 +147,7 @@ module.exports = Callsite;
 "
 `;
 
-exports[`es6class-types-module.js 1`] = `
+exports[`es6class-types-module.js-flow 1`] = `
 "/* @flow */
 import React from 'react';
 
diff --git a/tests/flow/rec/__snapshots__/jsfmt.spec.js.snap b/tests/flow/rec/__snapshots__/jsfmt.spec.js.snap
index 45268ba2f..49cbbc564 100644
--- a/tests/flow/rec/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/rec/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`issue-598.js 1`] = `
+exports[`issue-598.js-flow 1`] = `
 "/* @flow */
 
 type F<A> = { foo<B>(x: A): F<B> }
@@ -51,7 +51,7 @@ function identity<A>(val: A): Functor<A> {
 "
 `;
 
-exports[`issue-1228.js 1`] = `
+exports[`issue-1228.js-flow 1`] = `
 "/* @flow */
 
 type Task <error, value>
@@ -75,7 +75,7 @@ function id(x: Task<any, any>): Task<any, any> {
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "class P<X> { x: X; } // this is like Promise
 
 type Pstar<X> = X | Pstar<P<X>>; // this is like Promise*
@@ -114,7 +114,7 @@ pstar = (new P(): P<P<number>>); // OK
 "
 `;
 
-exports[`test2.js 1`] = `
+exports[`test2.js-flow 1`] = `
 "var a = []; // Array<X> ~> a
 function bar() {
   a = a.concat([]); // terminate despite expanding types:
@@ -179,7 +179,7 @@ class C<X> extends B<X> {}
 "
 `;
 
-exports[`test3.js 1`] = `
+exports[`test3.js-flow 1`] = `
 "type I<X> = () => I<I<X>>;
 type J<X> = () => J<J<X>>;
 
@@ -216,14 +216,14 @@ function bar(x: P<number>): () => P<number> {
 "
 `;
 
-exports[`test4.js 1`] = `
+exports[`test4.js-flow 1`] = `
 "type T = T // cycle in type alias should not cause non-termination
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 type T = T; // cycle in type alias should not cause non-termination
 "
 `;
 
-exports[`test5.js 1`] = `
+exports[`test5.js-flow 1`] = `
 "/* @flow */
 
 type NestedArray<T> = Array<T | NestedArray<T>>;
diff --git a/tests/flow/recheck-haste/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck-haste/__snapshots__/jsfmt.spec.js.snap
index cc86c4f5d..00da8efd1 100644
--- a/tests/flow/recheck-haste/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck-haste/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A1.js 1`] = `
+exports[`A1.js-flow 1`] = `
 "/**
  * @providesModule A
  * @flow
@@ -13,7 +13,7 @@ exports[`A1.js 1`] = `
 "
 `;
 
-exports[`A3.js 1`] = `
+exports[`A3.js-flow 1`] = `
 "// @flow
 
 require('A');
diff --git a/tests/flow/recheck-haste/tmp1A/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck-haste/tmp1A/__snapshots__/jsfmt.spec.js.snap
index f7da4e1fd..0ce9ac8d5 100644
--- a/tests/flow/recheck-haste/tmp1A/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck-haste/tmp1A/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A2.js 1`] = `
+exports[`A2.js-flow 1`] = `
 "/**
  * @providesModule B
  * @flow
diff --git a/tests/flow/recheck-haste/tmp2A/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck-haste/tmp2A/__snapshots__/jsfmt.spec.js.snap
index a0752a656..fe991cacd 100644
--- a/tests/flow/recheck-haste/tmp2A/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck-haste/tmp2A/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A3.js 1`] = `
+exports[`A3.js-flow 1`] = `
 "// @flow
 
 require('B');
diff --git a/tests/flow/recheck/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/__snapshots__/jsfmt.spec.js.snap
index 03e960245..cc18b68b7 100644
--- a/tests/flow/recheck/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`a1.js 1`] = `
+exports[`a1.js-flow 1`] = `
 "// @flow
 
 function foo(x: number): string { return 5; }
@@ -21,7 +21,7 @@ module.exports = foo;
 "
 `;
 
-exports[`a2.js 1`] = `
+exports[`a2.js-flow 1`] = `
 "// @flow
 
 const foo = require('./a1');
@@ -36,7 +36,7 @@ module.exports = foo(\\"\\");
 "
 `;
 
-exports[`a3.js 1`] = `
+exports[`a3.js-flow 1`] = `
 "// @flow
 
 const five = require('./a2');
@@ -51,7 +51,7 @@ const five = require(\\"./a2\\");
 "
 `;
 
-exports[`b0.js 1`] = `
+exports[`b0.js-flow 1`] = `
 "// @flow
 
 class C { x: C; }
@@ -72,7 +72,7 @@ module.exports = { C, E };
 "
 `;
 
-exports[`b1.js 1`] = `
+exports[`b1.js-flow 1`] = `
 "// @flow
 
 import { C, E } from \\"./b0\\";
@@ -99,7 +99,7 @@ module.exports = { C, D };
 "
 `;
 
-exports[`b2.js 1`] = `
+exports[`b2.js-flow 1`] = `
 "// @flow
 
 module.exports = require(\\"./b1\\");
@@ -110,7 +110,7 @@ module.exports = require(\\"./b1\\");
 "
 `;
 
-exports[`b3.js 1`] = `
+exports[`b3.js-flow 1`] = `
 "// @flow
 
 import { C, D } from \\"./b2\\";
@@ -125,7 +125,7 @@ import { C, D } from \\"./b2\\";
 "
 `;
 
-exports[`c1.js 1`] = `
+exports[`c1.js-flow 1`] = `
 "// @flow
 
 export function foo(props: { x: number }) { }
@@ -136,7 +136,7 @@ export function foo(props: { x: number }) {}
 "
 `;
 
-exports[`c2.js 1`] = `
+exports[`c2.js-flow 1`] = `
 "// @flow
 
 import { foo } from \\"./c1\\";
@@ -155,7 +155,7 @@ export function bar(props: { x: number }) {
 "
 `;
 
-exports[`c3.js 1`] = `
+exports[`c3.js-flow 1`] = `
 "// @flow
 
 import { bar } from \\"./c2\\";
@@ -170,7 +170,7 @@ bar({ x: 0 });
 "
 `;
 
-exports[`d1.js 1`] = `
+exports[`d1.js-flow 1`] = `
 "// @flow
 
 export class A {}
@@ -185,7 +185,7 @@ export var x = new A();
 "
 `;
 
-exports[`d2.js 1`] = `
+exports[`d2.js-flow 1`] = `
 "// @flow
 
 import {A, x} from \\"./d1\\";
@@ -198,7 +198,7 @@ export var y: A = x;
 "
 `;
 
-exports[`e1.js 1`] = `
+exports[`e1.js-flow 1`] = `
 "// @flow
 
 export type Action =
@@ -216,7 +216,7 @@ export const LIFE = 42;
 "
 `;
 
-exports[`e2.js 1`] = `
+exports[`e2.js-flow 1`] = `
 "// @flow
 
 import type { Action } from './e1';
@@ -243,7 +243,7 @@ import { LIFE } from \\"./e1\\";
 "
 `;
 
-exports[`f1.js 1`] = `
+exports[`f1.js-flow 1`] = `
 "// @flow
 
 type T = { x: number };
@@ -268,7 +268,7 @@ module.exports = { a, b, c };
 "
 `;
 
-exports[`f2.js 1`] = `
+exports[`f2.js-flow 1`] = `
 "// @flow
 
 var { a, b, c } = require('./f1');
@@ -281,7 +281,7 @@ var { a, b, c } = require(\\"./f1\\");
 "
 `;
 
-exports[`g1.js 1`] = `
+exports[`g1.js-flow 1`] = `
 "// @flow
 
 export class C { }
@@ -292,7 +292,7 @@ export class C {}
 "
 `;
 
-exports[`g2.js 1`] = `
+exports[`g2.js-flow 1`] = `
 "// @flow
 
 import { C } from './g1';
@@ -311,7 +311,7 @@ module.exports = { D };
 "
 `;
 
-exports[`g3.js 1`] = `
+exports[`g3.js-flow 1`] = `
 "// @flow
 
 import { C } from './g1';
@@ -328,7 +328,7 @@ import { D } from \\"./g2\\";
 "
 `;
 
-exports[`h1.js 1`] = `
+exports[`h1.js-flow 1`] = `
 "// @flow
 
 export type Foo = number;
@@ -339,7 +339,7 @@ export type Foo = number;
 "
 `;
 
-exports[`h2.js 1`] = `
+exports[`h2.js-flow 1`] = `
 "// @flow
 
 import type { Foo } from './h1';
diff --git a/tests/flow/recheck/tmp1a/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp1a/__snapshots__/jsfmt.spec.js.snap
index a7bf1066a..22a6e9729 100644
--- a/tests/flow/recheck/tmp1a/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp1a/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`a1.js 1`] = `
+exports[`a1.js-flow 1`] = `
 "// @flow
 
 function foo(x: number): number { return 5; }
diff --git a/tests/flow/recheck/tmp1b/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp1b/__snapshots__/jsfmt.spec.js.snap
index 4d9305e86..46f504f7d 100644
--- a/tests/flow/recheck/tmp1b/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp1b/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`b1.js 1`] = `
+exports[`b1.js-flow 1`] = `
 "// @flow
 
 import { C, E } from \\"./b0\\";
diff --git a/tests/flow/recheck/tmp1c/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp1c/__snapshots__/jsfmt.spec.js.snap
index e04c0c1db..58eed2383 100644
--- a/tests/flow/recheck/tmp1c/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp1c/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`c2.js 1`] = `
+exports[`c2.js-flow 1`] = `
 "// @flow
 
 import { foo } from \\"./c1\\";
diff --git a/tests/flow/recheck/tmp1d/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp1d/__snapshots__/jsfmt.spec.js.snap
index 0146cfd68..8fa7f3666 100644
--- a/tests/flow/recheck/tmp1d/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp1d/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`d1.js 1`] = `
+exports[`d1.js-flow 1`] = `
 "// @flow
 
 export class A {}
diff --git a/tests/flow/recheck/tmp1e/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp1e/__snapshots__/jsfmt.spec.js.snap
index 338e2c12e..bc9be67f8 100644
--- a/tests/flow/recheck/tmp1e/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp1e/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`e2.js 1`] = `
+exports[`e2.js-flow 1`] = `
 "// @flow
 
 import type { Action } from './e1';
diff --git a/tests/flow/recheck/tmp1f/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp1f/__snapshots__/jsfmt.spec.js.snap
index 6553b5426..3f905c586 100644
--- a/tests/flow/recheck/tmp1f/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp1f/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`f1.js 1`] = `
+exports[`f1.js-flow 1`] = `
 "// @flow
 
 type T = { x: number };
diff --git a/tests/flow/recheck/tmp1g/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp1g/__snapshots__/jsfmt.spec.js.snap
index e96b4760d..49f927423 100644
--- a/tests/flow/recheck/tmp1g/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp1g/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`g1.js 1`] = `
+exports[`g1.js-flow 1`] = `
 "// @flow
 
 export class C { }
diff --git a/tests/flow/recheck/tmp1h/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp1h/__snapshots__/jsfmt.spec.js.snap
index 2a51a4a36..9fb4b44f2 100644
--- a/tests/flow/recheck/tmp1h/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp1h/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`h1.js 1`] = `
+exports[`h1.js-flow 1`] = `
 "// @flow
 
 export type Bar = number;
diff --git a/tests/flow/recheck/tmp2a/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp2a/__snapshots__/jsfmt.spec.js.snap
index c5c79c97d..ef2ea1cb0 100644
--- a/tests/flow/recheck/tmp2a/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp2a/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`a1.js 1`] = `
+exports[`a1.js-flow 1`] = `
 "// @flow
 
 function foo(x: number): number { return 5; }
diff --git a/tests/flow/recheck/tmp2b/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp2b/__snapshots__/jsfmt.spec.js.snap
index 570b1b193..810de5a2f 100644
--- a/tests/flow/recheck/tmp2b/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp2b/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`b0.js 1`] = `
+exports[`b0.js-flow 1`] = `
 "// @flow
 
 class C { x: C; }
diff --git a/tests/flow/recheck/tmp2c/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp2c/__snapshots__/jsfmt.spec.js.snap
index e6791e86d..3da245883 100644
--- a/tests/flow/recheck/tmp2c/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp2c/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`c1.js 1`] = `
+exports[`c1.js-flow 1`] = `
 "// @flow
 
 export function foo(props: { y: number }) { }
diff --git a/tests/flow/recheck/tmp2e/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp2e/__snapshots__/jsfmt.spec.js.snap
index 6465844df..3e15c16b9 100644
--- a/tests/flow/recheck/tmp2e/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp2e/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`e1.js 1`] = `
+exports[`e1.js-flow 1`] = `
 "// @flow
 
 export type Action =
diff --git a/tests/flow/recheck/tmp2f/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp2f/__snapshots__/jsfmt.spec.js.snap
index 30f154f4d..1e0c104be 100644
--- a/tests/flow/recheck/tmp2f/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp2f/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`f1.js 1`] = `
+exports[`f1.js-flow 1`] = `
 "// @flow
 
 type T = { x: number };
diff --git a/tests/flow/recheck/tmp3e/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp3e/__snapshots__/jsfmt.spec.js.snap
index 4b6f3ecb3..2d8b1660d 100644
--- a/tests/flow/recheck/tmp3e/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp3e/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`e1.js 1`] = `
+exports[`e1.js-flow 1`] = `
 "// @flow
 
 export type Action =
@@ -18,7 +18,7 @@ export const LIFE = 0;
 "
 `;
 
-exports[`e2.js 1`] = `
+exports[`e2.js-flow 1`] = `
 "// @flow
 
 import type { Action } from './e1';
diff --git a/tests/flow/recheck/tmp3f/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp3f/__snapshots__/jsfmt.spec.js.snap
index ab6afe322..008719ee9 100644
--- a/tests/flow/recheck/tmp3f/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp3f/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`f1.js 1`] = `
+exports[`f1.js-flow 1`] = `
 "// @flow
 
 type T = { x: number };
diff --git a/tests/flow/recheck/tmp4f/__snapshots__/jsfmt.spec.js.snap b/tests/flow/recheck/tmp4f/__snapshots__/jsfmt.spec.js.snap
index 4e7f58b3d..2de12513d 100644
--- a/tests/flow/recheck/tmp4f/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/recheck/tmp4f/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`f1.js 1`] = `
+exports[`f1.js-flow 1`] = `
 "// @flow
 
 type T = { x: number };
diff --git a/tests/flow/record/__snapshots__/jsfmt.spec.js.snap b/tests/flow/record/__snapshots__/jsfmt.spec.js.snap
index 5a1baaf07..84bc83614 100644
--- a/tests/flow/record/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/record/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "type Key1 = 'foo' | 'bar'; // make an enum type with known key set
 var o1: {[key: Key1]: number} = {
   foo: 0,
diff --git a/tests/flow/refi/__snapshots__/jsfmt.spec.js.snap b/tests/flow/refi/__snapshots__/jsfmt.spec.js.snap
index e371d8f01..728eaff9e 100644
--- a/tests/flow/refi/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/refi/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`bound.js 1`] = `
+exports[`bound.js-flow 1`] = `
 "// refinements of bound vars (closed-over locals)
 // should have the same lifetimes as heap objects.
 
@@ -134,7 +134,7 @@ var tests = [
 "
 `;
 
-exports[`heap.js 1`] = `
+exports[`heap.js-flow 1`] = `
 "var tests =
 [
   function() {
@@ -619,7 +619,7 @@ var tests = [
 "
 `;
 
-exports[`lex.js 1`] = `
+exports[`lex.js-flow 1`] = `
 "function block_scope(x: string | number) {
   {
     let x;
@@ -696,7 +696,7 @@ function try_scope_catch(x: string | number) {
 "
 `;
 
-exports[`local.js 1`] = `
+exports[`local.js-flow 1`] = `
 "var paths =
 [
   function() {
@@ -870,7 +870,7 @@ var paths = [
 "
 `;
 
-exports[`null_tests.js 1`] = `
+exports[`null_tests.js-flow 1`] = `
 "var null_tests =
 [
   // expr != null
@@ -1177,7 +1177,7 @@ class D extends C {
 "
 `;
 
-exports[`switch.js 1`] = `
+exports[`switch.js-flow 1`] = `
 "// @flow
 function foo(a,b,c) {
   switch (c) {
@@ -1308,7 +1308,7 @@ function exhaustion3(x): number {
 "
 `;
 
-exports[`typeof_tests.js 1`] = `
+exports[`typeof_tests.js-flow 1`] = `
 "var null_tests =
 [
   // typeof expr == typename
@@ -1570,7 +1570,7 @@ class A {
 "
 `;
 
-exports[`undef_tests.js 1`] = `
+exports[`undef_tests.js-flow 1`] = `
 "var undef_tests =
 [
   // NOTE: not (yet?) supporting non-strict eq test for undefined
@@ -1721,7 +1721,7 @@ class A {
 "
 `;
 
-exports[`void_tests.js 1`] = `
+exports[`void_tests.js-flow 1`] = `
 "var void_tests =
 [
   // NOTE: not (yet?) supporting non-strict eq test for undefined
diff --git a/tests/flow/refinements/__snapshots__/jsfmt.spec.js.snap b/tests/flow/refinements/__snapshots__/jsfmt.spec.js.snap
index 76d1192e6..31320b3d1 100644
--- a/tests/flow/refinements/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/refinements/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`assignment.js 1`] = `
+exports[`assignment.js-flow 1`] = `
 "/* @flow */
 
 function foo(x : ?number) {
@@ -71,7 +71,7 @@ function bar2(x: Bar) {
 "
 `;
 
-exports[`ast_node.js 1`] = `
+exports[`ast_node.js-flow 1`] = `
 "type Node1 = {
   kind: 'Node1',
   prop1?: string
@@ -98,7 +98,7 @@ export type ASTNode = Node1 | Node2;
 "
 `;
 
-exports[`bool.js 1`] = `
+exports[`bool.js-flow 1`] = `
 "/* @flow */
 
 function foo(x: ?bool) {
@@ -195,7 +195,7 @@ let tests = [
 "
 `;
 
-exports[`computed_string_literal.js 1`] = `
+exports[`computed_string_literal.js-flow 1`] = `
 "// @flow
 
 type A = {
@@ -238,7 +238,7 @@ function testLiteralProperty(a: A) {
 "
 `;
 
-exports[`cond_prop.js 1`] = `
+exports[`cond_prop.js-flow 1`] = `
 "/* @flow */
 
 type Type = Name | ListType | NonNullType;
@@ -345,7 +345,7 @@ let tests = [
 "
 `;
 
-exports[`constants.js 1`] = `
+exports[`constants.js-flow 1`] = `
 "/* @flow */
 
 export const SUCCESS: 'SUCCESS' = 'SUCCESS';
@@ -358,7 +358,7 @@ export const ERROR: \\"ERROR\\" = \\"ERROR\\";
 "
 `;
 
-exports[`eq.js 1`] = `
+exports[`eq.js-flow 1`] = `
 "/* @flow */
 
 let tests = [
@@ -414,7 +414,7 @@ let tests = [
 "
 `;
 
-exports[`exists.js 1`] = `
+exports[`exists.js-flow 1`] = `
 "declare class Foo {
   foo: string;
 }
@@ -449,7 +449,7 @@ function foo2(x: ?Class<Foo>): string {
 "
 `;
 
-exports[`func_call.js 1`] = `
+exports[`func_call.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -478,7 +478,7 @@ let tests = [
 "
 `;
 
-exports[`hasOwnProperty.js 1`] = `
+exports[`hasOwnProperty.js-flow 1`] = `
 "/* @flow */
 
 function foo(x:{y?:() => void}) {
@@ -525,7 +525,7 @@ function bar(x: Object) {
 "
 `;
 
-exports[`heap_defassign.js 1`] = `
+exports[`heap_defassign.js-flow 1`] = `
 "// @flow
 
 type Obj = { p: number | string }
@@ -698,7 +698,7 @@ function def_assign_setprop_nohavoc(obj: Obj, obj2: Obj2) {
 "
 `;
 
-exports[`lib.js 1`] = `
+exports[`lib.js-flow 1`] = `
 "/* @flow */
 
 declare var BAZ: {stuff?: (x: number) => void} | void;
@@ -709,7 +709,7 @@ declare var BAZ: { stuff?: (x: number) => void } | void;
 "
 `;
 
-exports[`missing-property-cond.js 1`] = `
+exports[`missing-property-cond.js-flow 1`] = `
 "// @flow
 
 function foo1(o: { x: number }) {
@@ -826,7 +826,7 @@ function foo8(o: { p: mixed }) {
 "
 `;
 
-exports[`mixed.js 1`] = `
+exports[`mixed.js-flow 1`] = `
 "/* @flow */
 
 function takesNumber(x: number) {}
@@ -1073,14 +1073,14 @@ function arr0(x: mixed) {
 "
 `;
 
-exports[`node1.js 1`] = `
+exports[`node1.js-flow 1`] = `
 "module.exports = 'Node1';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 module.exports = \\"Node1\\";
 "
 `;
 
-exports[`not.js 1`] = `
+exports[`not.js-flow 1`] = `
 "/* @flow */
 
 function foo(x: ?bool) {
@@ -1189,7 +1189,7 @@ let tests = [
 "
 `;
 
-exports[`null.js 1`] = `
+exports[`null.js-flow 1`] = `
 "/* @flow */
 
 function null_bogus_comparison() {
@@ -1214,7 +1214,7 @@ function null_bogus_comparison() {
 "
 `;
 
-exports[`number.js 1`] = `
+exports[`number.js-flow 1`] = `
 "// @flow
 
 type Mode = 0 | 1 | 2;
@@ -1461,7 +1461,7 @@ let tests = [
 "
 `;
 
-exports[`property.js 1`] = `
+exports[`property.js-flow 1`] = `
 "/* @flow */
 
 function a(x: {[key: string]: ?string}, y: string): string {
@@ -1633,7 +1633,7 @@ function c3(
 "
 `;
 
-exports[`refinements.js 1`] = `
+exports[`refinements.js-flow 1`] = `
 "function foo(b) {
     var x = b? 0 : null;
     while (typeof x == \\"string\\" || typeof x == \\"number\\") {
@@ -1796,7 +1796,7 @@ function global_in_conditional2(x: number) {
 "
 `;
 
-exports[`string.js 1`] = `
+exports[`string.js-flow 1`] = `
 "// @flow
 
 type Mode = \\"a\\" | \\"b\\" | \\"c\\";
@@ -2069,7 +2069,7 @@ let tests = [
 "
 `;
 
-exports[`super_member.js 1`] = `
+exports[`super_member.js-flow 1`] = `
 "/* @flow */
 
 class A {
@@ -2127,7 +2127,7 @@ class C extends A {
 "
 `;
 
-exports[`switch.js 1`] = `
+exports[`switch.js-flow 1`] = `
 "/* @flow */
 
 function foo(text: string | number): string {
@@ -2237,7 +2237,7 @@ function corge(text: string | number | Array<string>): string {
 "
 `;
 
-exports[`tagged_union.js 1`] = `
+exports[`tagged_union.js-flow 1`] = `
 "// example 1
 
 type Type = Name | ListType;
@@ -2734,7 +2734,7 @@ let tests = [
 "
 `;
 
-exports[`tagged_union_import.js 1`] = `
+exports[`tagged_union_import.js-flow 1`] = `
 "/* @flow */
 
 import { SUCCESS, ERROR } from './constants'
@@ -2785,7 +2785,7 @@ function handleStatus(status: Success | Error) {
 "
 `;
 
-exports[`typeof.js 1`] = `
+exports[`typeof.js-flow 1`] = `
 "/* @flow */
 
 function foo(x: bool | number) {
@@ -2918,7 +2918,7 @@ function testInvalidTemplateLiteral(x: string | number) {
 "
 `;
 
-exports[`undef.js 1`] = `
+exports[`undef.js-flow 1`] = `
 "/* @flow */
 
 function undef_var(x: ?number) {
@@ -3083,7 +3083,7 @@ function undef_bogus_comparison() {
 "
 `;
 
-exports[`union.js 1`] = `
+exports[`union.js-flow 1`] = `
 "/* @flow */
 
 type thing = number | bool
@@ -3130,7 +3130,7 @@ function baz(x: ?thing) {
 "
 `;
 
-exports[`void.js 1`] = `
+exports[`void.js-flow 1`] = `
 "/* @flow */
 
 function void_var(x: ?number) {
diff --git a/tests/flow/reflection/__snapshots__/jsfmt.spec.js.snap b/tests/flow/reflection/__snapshots__/jsfmt.spec.js.snap
index d12812a68..5e0f02d5b 100644
--- a/tests/flow/reflection/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/reflection/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`type.js 1`] = `
+exports[`type.js-flow 1`] = `
 "declare var a: number;
 var b: typeof a = \\"...\\";
 var c: typeof a = \\"...\\";
diff --git a/tests/flow/regexp/__snapshots__/jsfmt.spec.js.snap b/tests/flow/regexp/__snapshots__/jsfmt.spec.js.snap
index e4cca008c..f91d328e2 100644
--- a/tests/flow/regexp/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/regexp/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`regexp.js 1`] = `
+exports[`regexp.js-flow 1`] = `
 "var patt=/Hello/g
 var match:number = patt.test(\\"Hello world!\\");
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/replace/__snapshots__/jsfmt.spec.js.snap b/tests/flow/replace/__snapshots__/jsfmt.spec.js.snap
index 097f768c4..1ae8c6c70 100644
--- a/tests/flow/replace/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/replace/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "var a = 0;
 
 function foo(x) { }
diff --git a/tests/flow/require/__snapshots__/jsfmt.spec.js.snap b/tests/flow/require/__snapshots__/jsfmt.spec.js.snap
index 55c09fecf..7c902580b 100644
--- a/tests/flow/require/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/require/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "/* @flow */
 
 exports.numberValue = 42;
@@ -11,14 +11,14 @@ exports.numberValue = 42;
 "
 `;
 
-exports[`C.js 1`] = `
+exports[`C.js-flow 1`] = `
 "/* @flow */
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 /* @flow */
 "
 `;
 
-exports[`E.js 1`] = `
+exports[`E.js-flow 1`] = `
 "/* @flow */
 
 // Local \`exports\` var is just a ref to module.exports, so mutating the original
@@ -43,7 +43,7 @@ exports = { stringValue: \\"\\" };
 "
 `;
 
-exports[`ProvidesModuleA.js 1`] = `
+exports[`ProvidesModuleA.js-flow 1`] = `
 "/**
  * @providesModule A
  * @flow
@@ -60,7 +60,7 @@ exports.numberValue = 42;
 "
 `;
 
-exports[`ProvidesModuleD.js 1`] = `
+exports[`ProvidesModuleD.js-flow 1`] = `
 "/**
  * @providesModule D
  * @flow
@@ -73,7 +73,7 @@ exports[`ProvidesModuleD.js 1`] = `
 "
 `;
 
-exports[`not_builtin_require.js 1`] = `
+exports[`not_builtin_require.js-flow 1`] = `
 "// @flow
 
 function require() {}
@@ -86,7 +86,7 @@ require(\\"not a module name\\");
 "
 `;
 
-exports[`not_builtin_require2.js 1`] = `
+exports[`not_builtin_require2.js-flow 1`] = `
 "// @flow
 
 type require = number;
@@ -99,7 +99,7 @@ var a: require = 42;
 "
 `;
 
-exports[`require.js 1`] = `
+exports[`require.js-flow 1`] = `
 "/* @flow */
 
 function takesANumber(num: number): void {}
diff --git a/tests/flow/requireLazy/__snapshots__/jsfmt.spec.js.snap b/tests/flow/requireLazy/__snapshots__/jsfmt.spec.js.snap
index 153913e9b..3a43c8eae 100644
--- a/tests/flow/requireLazy/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/requireLazy/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "/**
  * @providesModule A
  * @flow
@@ -23,7 +23,7 @@ module.exports = {
 "
 `;
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "/**
  * @providesModule B
  * @flow
@@ -46,7 +46,7 @@ module.exports = {
 "
 `;
 
-exports[`requireLazy.js 1`] = `
+exports[`requireLazy.js-flow 1`] = `
 "/**
  * @flow
  */
diff --git a/tests/flow/return/__snapshots__/jsfmt.spec.js.snap b/tests/flow/return/__snapshots__/jsfmt.spec.js.snap
index e9aba62c7..3cfe77994 100644
--- a/tests/flow/return/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/return/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`function_return.js 1`] = `
+exports[`function_return.js-flow 1`] = `
 "class C {
     foo() { }
     bar() { return; }
@@ -81,7 +81,7 @@ module.exports = C;
 "
 `;
 
-exports[`void.js 1`] = `
+exports[`void.js-flow 1`] = `
 "/* This is a regression test. At one point we incorrectly inferred the return
    type of functions that have an explicit \`undefined\` to be only \`undefined\` --
    ignoring other possible exits. */
diff --git a/tests/flow/return_new/__snapshots__/jsfmt.spec.js.snap b/tests/flow/return_new/__snapshots__/jsfmt.spec.js.snap
index de09bf616..c70aa241a 100644
--- a/tests/flow/return_new/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/return_new/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "function Foo() { return {}; }
 var foo: number = new Foo(); // error (returns object literal above)
 
@@ -35,7 +35,7 @@ var a: A = new B(); // OK (returns new A)
 "
 `;
 
-exports[`test2.js 1`] = `
+exports[`test2.js-flow 1`] = `
 "declare class D {
   constructor(): { x: number }; // OK
   y: any;
diff --git a/tests/flow/seal/__snapshots__/jsfmt.spec.js.snap b/tests/flow/seal/__snapshots__/jsfmt.spec.js.snap
index 67d693186..759478623 100644
--- a/tests/flow/seal/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/seal/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`imp.js 1`] = `
+exports[`imp.js-flow 1`] = `
 "/* @flow */
 
 var imp = require('./obj_annot');
@@ -13,7 +13,7 @@ imp({ name: \\"imp\\" });
 "
 `;
 
-exports[`obj_annot.js 1`] = `
+exports[`obj_annot.js-flow 1`] = `
 "/* @flow */
 
 function foo(param: { name: string; }): number {
diff --git a/tests/flow/sealed/__snapshots__/jsfmt.spec.js.snap b/tests/flow/sealed/__snapshots__/jsfmt.spec.js.snap
index 35e160759..15417b684 100644
--- a/tests/flow/sealed/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/sealed/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`function.js 1`] = `
+exports[`function.js-flow 1`] = `
 "/* @flow */
 
 function Bar(x: number) {
@@ -27,7 +27,7 @@ module.exports = Bar;
 "
 `;
 
-exports[`proto.js 1`] = `
+exports[`proto.js-flow 1`] = `
 "function Foo() { }
 var o = new Foo();
 var x:number = o.x;
@@ -66,7 +66,7 @@ module.exports = export_o;
 "
 `;
 
-exports[`sealed.js 1`] = `
+exports[`sealed.js-flow 1`] = `
 "var o = require('./proto');
 
 o.z = 0;
diff --git a/tests/flow/sealed_objects/__snapshots__/jsfmt.spec.js.snap b/tests/flow/sealed_objects/__snapshots__/jsfmt.spec.js.snap
index 167bc1be8..2380f2906 100644
--- a/tests/flow/sealed_objects/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/sealed_objects/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "var o1 = { x: 0 };
 var s1: string = o1.y; // error
 
diff --git a/tests/flow/shape/__snapshots__/jsfmt.spec.js.snap b/tests/flow/shape/__snapshots__/jsfmt.spec.js.snap
index 3931e96c1..a54b25b0b 100644
--- a/tests/flow/shape/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/shape/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "type Foo = {
   field: number,
 }
diff --git a/tests/flow/simple_arrays/__snapshots__/jsfmt.spec.js.snap b/tests/flow/simple_arrays/__snapshots__/jsfmt.spec.js.snap
index 8a7650872..d8e67d32b 100644
--- a/tests/flow/simple_arrays/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/simple_arrays/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`array.js 1`] = `
+exports[`array.js-flow 1`] = `
 "/* @flow */
 var a = [];
 for (var i = 0; i < 10; ++i) {
@@ -54,7 +54,7 @@ function baz(i: number): string {
 "
 `;
 
-exports[`array2.js 1`] = `
+exports[`array2.js-flow 1`] = `
 "/* @flow */
 var a = [];
 for (var i = 0; i < 10; ++i) {
diff --git a/tests/flow/singleton/__snapshots__/jsfmt.spec.js.snap b/tests/flow/singleton/__snapshots__/jsfmt.spec.js.snap
index 5e59ed37f..225c4074a 100644
--- a/tests/flow/singleton/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/singleton/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`boolean.js 1`] = `
+exports[`boolean.js-flow 1`] = `
 "/* @flow */
 
 function veryOptimistic(isThisAwesome: true): boolean {
@@ -79,7 +79,7 @@ function alwaysFalsy(x: boolean): false {
 "
 `;
 
-exports[`number.js 1`] = `
+exports[`number.js-flow 1`] = `
 "/* @flow */
 
 function highlander(howMany: 1): number {
@@ -129,7 +129,7 @@ sort((x, y) => -1);
 "
 `;
 
-exports[`string.js 1`] = `
+exports[`string.js-flow 1`] = `
 "/* @flow */
 
 type NoSpaces = \\"foobar\\"
diff --git a/tests/flow/spread/__snapshots__/jsfmt.spec.js.snap b/tests/flow/spread/__snapshots__/jsfmt.spec.js.snap
index d71f81b74..9125ecdd2 100644
--- a/tests/flow/spread/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/spread/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "function parseTimestamp(timestamp: string): number {
     return 0;
 }
@@ -67,7 +67,7 @@ function parseTimeframe(line: string): { begin: number, end: number } {
 "
 `;
 
-exports[`test2.js 1`] = `
+exports[`test2.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -90,7 +90,7 @@ foo({ foo: 42 });
 "
 `;
 
-exports[`test3.js 1`] = `
+exports[`test3.js-flow 1`] = `
 "var p = { y: \\"\\" };
 var q = { z: \\"\\" };
 var o = {
@@ -129,7 +129,7 @@ var t: boolean = s.y; // error, string or number
 "
 `;
 
-exports[`test4.js 1`] = `
+exports[`test4.js-flow 1`] = `
 "/* @flow */
 function test(...nums: Array<number>) {}
 
@@ -142,7 +142,7 @@ test(0, ...[1, 2, 3]);
 "
 `;
 
-exports[`test5.js 1`] = `
+exports[`test5.js-flow 1`] = `
 "/* @flow */
 
 declare function map<Tv, TNext>(
@@ -197,7 +197,7 @@ function test(
 "
 `;
 
-exports[`test6.js 1`] = `
+exports[`test6.js-flow 1`] = `
 "var o = {
   foo: 'bar'
 };
@@ -242,7 +242,7 @@ for (var i = 0; i < 10; i++) {
 "
 `;
 
-exports[`test7.js 1`] = `
+exports[`test7.js-flow 1`] = `
 "// @flow
 
 let tests = [
diff --git a/tests/flow/static_overload/__snapshots__/jsfmt.spec.js.snap b/tests/flow/static_overload/__snapshots__/jsfmt.spec.js.snap
index 4c45c87f0..2cf37727b 100644
--- a/tests/flow/static_overload/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/static_overload/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "var x: number = StaticOverload.foo(0);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 var x: number = StaticOverload.foo(0);
diff --git a/tests/flow/static_overload/lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/static_overload/lib/__snapshots__/jsfmt.spec.js.snap
index e35773db9..a5b6da257 100644
--- a/tests/flow/static_overload/lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/static_overload/lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`lib.js 1`] = `
+exports[`lib.js-flow 1`] = `
 "declare class StaticOverload {
   static foo(x: number): number;
   static foo(x: string): string;
diff --git a/tests/flow/statics/__snapshots__/jsfmt.spec.js.snap b/tests/flow/statics/__snapshots__/jsfmt.spec.js.snap
index 32ee59fab..213a6f67e 100644
--- a/tests/flow/statics/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/statics/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`class_statics.js 1`] = `
+exports[`class_statics.js-flow 1`] = `
 "class C {
   static f(x:number) { }
   static x:string;
@@ -26,7 +26,7 @@ C.x = 0;
 "
 `;
 
-exports[`funstatics.js 1`] = `
+exports[`funstatics.js-flow 1`] = `
 "function C() { }
 C.prototype.f = function() { return C.g(0); }
 C.g = function(x) { return x; };
diff --git a/tests/flow/strict/__snapshots__/jsfmt.spec.js.snap b/tests/flow/strict/__snapshots__/jsfmt.spec.js.snap
index 5467e378c..806da2547 100644
--- a/tests/flow/strict/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/strict/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`annot.js 1`] = `
+exports[`annot.js-flow 1`] = `
 "var A = require('./unknown_class');
 
 class B extends A {
@@ -27,7 +27,7 @@ module.exports = B;
 "
 `;
 
-exports[`fun.js 1`] = `
+exports[`fun.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -60,7 +60,7 @@ module.exports = f;
 "
 `;
 
-exports[`obj.js 1`] = `
+exports[`obj.js-flow 1`] = `
 "/**
  * @flow
  */
diff --git a/tests/flow/strict_requires/__snapshots__/jsfmt.spec.js.snap b/tests/flow/strict_requires/__snapshots__/jsfmt.spec.js.snap
index 26b6e55c8..e141cab57 100644
--- a/tests/flow/strict_requires/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/strict_requires/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "/* @flow */
 module.exports = 0;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -9,7 +9,7 @@ module.exports = 0;
 "
 `;
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "/* @flow */
 module.exports = { foo: \\"\\" }
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -18,7 +18,7 @@ module.exports = { foo: \\"\\" };
 "
 `;
 
-exports[`C.js 1`] = `
+exports[`C.js-flow 1`] = `
 "/* @flow */
 var o = {
     A: require('./A'),
@@ -35,7 +35,7 @@ module.exports = o;
 "
 `;
 
-exports[`D.js 1`] = `
+exports[`D.js-flow 1`] = `
 "/* @flow */
 var C = require('./C');
 var x: number = C.foo;
diff --git a/tests/flow/structural_subtyping/__snapshots__/jsfmt.spec.js.snap b/tests/flow/structural_subtyping/__snapshots__/jsfmt.spec.js.snap
index 5a351643d..f5ea86dd4 100644
--- a/tests/flow/structural_subtyping/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/structural_subtyping/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`builtin.js 1`] = `
+exports[`builtin.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -29,7 +29,7 @@ var lengthTest4: IHasLength = true; // bool doesn't have length
 "
 `;
 
-exports[`class.js 1`] = `
+exports[`class.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -80,7 +80,7 @@ var testInstance3: IHasYString = new ClassWithXString(); // Error missing prop
 "
 `;
 
-exports[`obj.js 1`] = `
+exports[`obj.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -125,7 +125,7 @@ function propTest6(y: { [key: string]: number }) {
 "
 `;
 
-exports[`optional.js 1`] = `
+exports[`optional.js-flow 1`] = `
 "/* @flow */
 
 interface HasOptional {
diff --git a/tests/flow/suggest/__snapshots__/jsfmt.spec.js.snap b/tests/flow/suggest/__snapshots__/jsfmt.spec.js.snap
index dae74cf93..68c31159c 100644
--- a/tests/flow/suggest/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/suggest/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`lib.js 1`] = `
+exports[`lib.js-flow 1`] = `
 "/* @flow */
 
 function bar(w: number): number { return w; }
@@ -17,7 +17,7 @@ module.exports = bar;
 "
 `;
 
-exports[`suggest.js 1`] = `
+exports[`suggest.js-flow 1`] = `
 "/* @flow */
 
 var bar = require('./lib');
diff --git a/tests/flow/super/__snapshots__/jsfmt.spec.js.snap b/tests/flow/super/__snapshots__/jsfmt.spec.js.snap
index fb64d97a5..baf7facda 100644
--- a/tests/flow/super/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/super/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`constructor.js 1`] = `
+exports[`constructor.js-flow 1`] = `
 "class A { x: number; }
 
 class B {
@@ -315,7 +315,7 @@ class N extends N_ {
 "
 `;
 
-exports[`import.js 1`] = `
+exports[`import.js-flow 1`] = `
 "class D {
   foo(): number { return 0; }
 }
@@ -330,7 +330,7 @@ module.exports = D;
 "
 `;
 
-exports[`super.js 1`] = `
+exports[`super.js-flow 1`] = `
 "
 class A {
   constructor(x:number) { }
@@ -380,7 +380,7 @@ class B extends A {
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "var D = require('./import');
 class C extends D {
   constructor() { return super(); }
diff --git a/tests/flow/suppress/__snapshots__/jsfmt.spec.js.snap b/tests/flow/suppress/__snapshots__/jsfmt.spec.js.snap
index 62a5e1825..73e4b4611 100644
--- a/tests/flow/suppress/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/suppress/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "// $FlowFixMe
 var test1: string = 123; // This error should be suppressed
 
@@ -53,7 +53,7 @@ var test6: string = 123;
 "
 `;
 
-exports[`B.js 1`] = `
+exports[`B.js-flow 1`] = `
 "// $FlowFixMe
 var test1: string = library_num;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -62,7 +62,7 @@ var test1: string = library_num;
 "
 `;
 
-exports[`C.js 1`] = `
+exports[`C.js-flow 1`] = `
 "function takesAString(x: string): void {}
 
 function runTest(y: number): void {
@@ -83,7 +83,7 @@ function runTest(y: number): void {
 "
 `;
 
-exports[`lib.js 1`] = `
+exports[`lib.js-flow 1`] = `
 "declare var library_num: number;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 declare var library_num: number;
diff --git a/tests/flow/suppress_incremental/__snapshots__/jsfmt.spec.js.snap b/tests/flow/suppress_incremental/__snapshots__/jsfmt.spec.js.snap
index a1f78c9b3..1be19d9fb 100644
--- a/tests/flow/suppress_incremental/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/suppress_incremental/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "// @flow
 
 (123: number); // no errors
diff --git a/tests/flow/suppress_traces/__snapshots__/jsfmt.spec.js.snap b/tests/flow/suppress_traces/__snapshots__/jsfmt.spec.js.snap
index 2c91ea6bc..1be20bc25 100644
--- a/tests/flow/suppress_traces/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/suppress_traces/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`traces.js 1`] = `
+exports[`traces.js-flow 1`] = `
 "/*
  * The location marked with the FlowFixMe does not show up in the original
  * error but shows up in the flow check --traces 10 result. This test makes
diff --git a/tests/flow/switch/__snapshots__/jsfmt.spec.js.snap b/tests/flow/switch/__snapshots__/jsfmt.spec.js.snap
index 23d0e5c99..60991baf2 100644
--- a/tests/flow/switch/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/switch/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`more_switch.js 1`] = `
+exports[`more_switch.js-flow 1`] = `
 "/* @flow */
 
 function foo(x): number {
@@ -64,7 +64,7 @@ function baz(x): number {
 "
 `;
 
-exports[`switch.js 1`] = `
+exports[`switch.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -128,7 +128,7 @@ function qux(b) {
 "
 `;
 
-exports[`switch_default_fallthrough.js 1`] = `
+exports[`switch_default_fallthrough.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -227,7 +227,7 @@ function baz(x: mixed): number {
 "
 `;
 
-exports[`trailing_cases.js 1`] = `
+exports[`trailing_cases.js-flow 1`] = `
 "/**
  * trailing cases are allowed - spot checks that we handle them as usual
  * @flow
diff --git a/tests/flow/symbol/__snapshots__/jsfmt.spec.js.snap b/tests/flow/symbol/__snapshots__/jsfmt.spec.js.snap
index f5c0c0683..9bb166c7e 100644
--- a/tests/flow/symbol/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/symbol/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`symbol.js 1`] = `
+exports[`symbol.js-flow 1`] = `
 "var FOO = Symbol();
 var BAR = Symbol('bar');
 
diff --git a/tests/flow/symlink/__snapshots__/jsfmt.spec.js.snap b/tests/flow/symlink/__snapshots__/jsfmt.spec.js.snap
index d1f261a36..9e7358312 100644
--- a/tests/flow/symlink/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/symlink/__snapshots__/jsfmt.spec.js.snap
@@ -1,20 +1,20 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`bar.js 1`] = `
+exports[`bar.js-flow 1`] = `
 "export type Foo = { x: number; }
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export type Foo = { x: number };
 "
 `;
 
-exports[`foo.js 1`] = `
+exports[`foo.js-flow 1`] = `
 "export type Foo = { x: number; }
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 export type Foo = { x: number };
 "
 `;
 
-exports[`qux.js 1`] = `
+exports[`qux.js-flow 1`] = `
 "import type { Foo } from './bar.js';
 ({ x: \\"\\" }: Foo);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/tagged-unions/__snapshots__/jsfmt.spec.js.snap b/tests/flow/tagged-unions/__snapshots__/jsfmt.spec.js.snap
index d83426a02..34d6f474e 100644
--- a/tests/flow/tagged-unions/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/tagged-unions/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`classes.js 1`] = `
+exports[`classes.js-flow 1`] = `
 "// @flow
 
 class Foo {
@@ -67,7 +67,7 @@ function bar(x: Bar): string {
 "
 `;
 
-exports[`interfaces-neg.js 1`] = `
+exports[`interfaces-neg.js-flow 1`] = `
 "/* @flow */
 
 declare interface IDataBase {
@@ -124,7 +124,7 @@ if (data.kind === \\"user\\") {
 "
 `;
 
-exports[`interfaces-pos.js 1`] = `
+exports[`interfaces-pos.js-flow 1`] = `
 "/* @flow */
 
 declare interface IDataBase {
@@ -181,7 +181,7 @@ if (data.kind === \\"system\\") {
 "
 `;
 
-exports[`type-decls-neg.js 1`] = `
+exports[`type-decls-neg.js-flow 1`] = `
 "/* @flow */
 
 type DataBase = {
@@ -246,7 +246,7 @@ if (data.kind === \\"user\\") {
 "
 `;
 
-exports[`type-decls-pos.js 1`] = `
+exports[`type-decls-pos.js-flow 1`] = `
 "/* @flow */
 
 type DataBase = {
diff --git a/tests/flow/taint/__snapshots__/jsfmt.spec.js.snap b/tests/flow/taint/__snapshots__/jsfmt.spec.js.snap
index 8dd7bb748..c45c7704e 100644
--- a/tests/flow/taint/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/taint/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`adder.js 1`] = `
+exports[`adder.js-flow 1`] = `
 "// @flow
 
 function f(x : $Tainted<number>, y : $Tainted<number>) {
@@ -67,7 +67,7 @@ function f7(x: $Tainted<string>, y: $Tainted<number>) {
 "
 `;
 
-exports[`any_object.js 1`] = `
+exports[`any_object.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -122,7 +122,7 @@ let tests = [
 "
 `;
 
-exports[`call-object-property.js 1`] = `
+exports[`call-object-property.js-flow 1`] = `
 "// @flow
 
 function foo(x : $Tainted<string>, o : Object) {
@@ -177,7 +177,7 @@ function f_foo3(f1: Function, o1: Object, o2: { t: $Tainted<string> }) {
 "
 `;
 
-exports[`comparator.js 1`] = `
+exports[`comparator.js-flow 1`] = `
 "// @flow
 // Should cause an error.
 function f(x : $Tainted<string>, y : $Tainted<number>) {
@@ -218,7 +218,7 @@ function f3(x: $Tainted<string>, y: string) {
 "
 `;
 
-exports[`function.js 1`] = `
+exports[`function.js-flow 1`] = `
 "// @flow
 
 let tests = [
@@ -251,7 +251,7 @@ let tests = [
 "
 `;
 
-exports[`globals.js 1`] = `
+exports[`globals.js-flow 1`] = `
 "// @flow
 
 class A {
@@ -280,7 +280,7 @@ class A {
 "
 `;
 
-exports[`lib.js 1`] = `
+exports[`lib.js-flow 1`] = `
 "declare class FakeLocation {
   assign(url: string): void;
 }
@@ -309,7 +309,7 @@ declare var fakeLocation: FakeLocation;
 "
 `;
 
-exports[`taint1.js 1`] = `
+exports[`taint1.js-flow 1`] = `
 "/*
  *
  * @flow
@@ -334,7 +334,7 @@ class A {
 "
 `;
 
-exports[`taint2.js 1`] = `
+exports[`taint2.js-flow 1`] = `
 "/*
  *
  * @flow
@@ -359,7 +359,7 @@ class A {
 "
 `;
 
-exports[`taint3.js 1`] = `
+exports[`taint3.js-flow 1`] = `
 "/*
  *
  * @flow
@@ -388,7 +388,7 @@ class A {
 "
 `;
 
-exports[`taint4.js 1`] = `
+exports[`taint4.js-flow 1`] = `
 "/*
  *
  * @flow
@@ -419,7 +419,7 @@ function f(x: $Tainted<any>) {
 "
 `;
 
-exports[`use-types.js 1`] = `
+exports[`use-types.js-flow 1`] = `
 "/*
  * @flow
  */
diff --git a/tests/flow/template/__snapshots__/jsfmt.spec.js.snap b/tests/flow/template/__snapshots__/jsfmt.spec.js.snap
index e5055b8c3..8360940f4 100644
--- a/tests/flow/template/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/template/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`template.js 1`] = `
+exports[`template.js-flow 1`] = `
 "/* @flow */
 
 (\`foo\`: string); // ok
diff --git a/tests/flow/this/__snapshots__/jsfmt.spec.js.snap b/tests/flow/this/__snapshots__/jsfmt.spec.js.snap
index f7a61987b..a2edc5234 100644
--- a/tests/flow/this/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/this/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`This.js 1`] = `
+exports[`This.js-flow 1`] = `
 "/* @providesModule This */
 
 function F() { this.x = 0; }
@@ -131,7 +131,7 @@ module.exports = true;
 "
 `;
 
-exports[`arrows.js 1`] = `
+exports[`arrows.js-flow 1`] = `
 "class C {
   foo() {
     return () => { return this.bar(); }; // OK, since this: C
diff --git a/tests/flow/this_ctor/__snapshots__/jsfmt.spec.js.snap b/tests/flow/this_ctor/__snapshots__/jsfmt.spec.js.snap
index 5b8bde356..10d709442 100644
--- a/tests/flow/this_ctor/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/this_ctor/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "class A {
   n: number;
   constructor(n: number) {
diff --git a/tests/flow/this_type/__snapshots__/jsfmt.spec.js.snap b/tests/flow/this_type/__snapshots__/jsfmt.spec.js.snap
index aa3f60edf..f49251c59 100644
--- a/tests/flow/this_type/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/this_type/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`class_expr.js 1`] = `
+exports[`class_expr.js-flow 1`] = `
 "/* @flow */
 // issue #1191
 
@@ -21,7 +21,7 @@ const Thing = class Thing {
 "
 `;
 
-exports[`contra.js 1`] = `
+exports[`contra.js-flow 1`] = `
 "// Counterexample with contravariant this type
 
 class C {
@@ -142,7 +142,7 @@ class Misc {
 "
 `;
 
-exports[`export.js 1`] = `
+exports[`export.js-flow 1`] = `
 "export class A1 {
   foo(): this { return this; }
   bar(): this { return this; }
@@ -181,7 +181,7 @@ export class A3<X> extends A2<X> {}
 "
 `;
 
-exports[`generics.js 1`] = `
+exports[`generics.js-flow 1`] = `
 "class Generic<X> {
   clone(): Generic<X> { return this; }
 }
@@ -209,7 +209,7 @@ class ImplicitNumber extends Implicit {
 "
 `;
 
-exports[`import.js 1`] = `
+exports[`import.js-flow 1`] = `
 "// Check that imports are handled properly with this types
 
 import { A1 } from './export';
@@ -262,7 +262,7 @@ class B3<X> extends A3<X> {
 "
 `;
 
-exports[`interface.js 1`] = `
+exports[`interface.js-flow 1`] = `
 "interface I { xs: Array<this>; }
 interface J { f(): J; }
 class C {
@@ -289,7 +289,7 @@ function bar(c: C): J {
 "
 `;
 
-exports[`lib_client.js 1`] = `
+exports[`lib_client.js-flow 1`] = `
 "(new DoublyLinkedList().prev(): DoublyLinkedList);
 (new DoublyLinkedList().next(): DoublyLinkedList)
 
@@ -314,7 +314,7 @@ class C {
 "
 `;
 
-exports[`self.js 1`] = `
+exports[`self.js-flow 1`] = `
 "class A {
   foo() { return this; } // return of foo is not annotated to get around
                          // substituting this below
@@ -337,7 +337,7 @@ class A {
 "
 `;
 
-exports[`statics.js 1`] = `
+exports[`statics.js-flow 1`] = `
 "// supporting \`this\` type in statics
 
 class A {
@@ -377,7 +377,7 @@ class B extends A {} // inherits statics method too, with \`this\` bound to the
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "// Examples without \`this\` types (compare with examples below)
 
 class Base {
diff --git a/tests/flow/this_type/lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/this_type/lib/__snapshots__/jsfmt.spec.js.snap
index 9c1e4860e..a7c306902 100644
--- a/tests/flow/this_type/lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/this_type/lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`decl.js 1`] = `
+exports[`decl.js-flow 1`] = `
 "// The following declare classes use \`this\` types effectively to avoid type
 // errors in ../lib_client.js. If support for \`this\` types in declare classes
 // is disabled for perf reasons, these will produce warnings.
diff --git a/tests/flow/throw/__snapshots__/jsfmt.spec.js.snap b/tests/flow/throw/__snapshots__/jsfmt.spec.js.snap
index 04dc73905..d65cc0893 100644
--- a/tests/flow/throw/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/throw/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "/**
  * @flow
  */
diff --git a/tests/flow/traces/__snapshots__/jsfmt.spec.js.snap b/tests/flow/traces/__snapshots__/jsfmt.spec.js.snap
index c0561d937..bc0791d4b 100644
--- a/tests/flow/traces/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/traces/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Traces.js 1`] = `
+exports[`Traces.js-flow 1`] = `
 "// arg/param type mismatch on arg 0
 function g0(y:string) { }
 function f0(x) { g0(x) }
@@ -57,7 +57,7 @@ f3(double);
 "
 `;
 
-exports[`Traces2.js 1`] = `
+exports[`Traces2.js-flow 1`] = `
 "// @flow
 
 var React = require('react');
diff --git a/tests/flow/traits/__snapshots__/jsfmt.spec.js.snap b/tests/flow/traits/__snapshots__/jsfmt.spec.js.snap
index 3c2167656..3db5c5542 100644
--- a/tests/flow/traits/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/traits/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "declare class Foo extends Qux<string> mixins Bar<number> {
   // KeyedCollection <: Collection
   // ...KeyedIterable
@@ -46,7 +46,7 @@ declare class Baz<T> {
 "
 `;
 
-exports[`test2.js 1`] = `
+exports[`test2.js-flow 1`] = `
 "declare interface I { }
 declare class C mixins I { }
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/flow/try/__snapshots__/jsfmt.spec.js.snap b/tests/flow/try/__snapshots__/jsfmt.spec.js.snap
index 8004b0399..16f5174d3 100644
--- a/tests/flow/try/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/try/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`abnormals.js 1`] = `
+exports[`abnormals.js-flow 1`] = `
 "/* @flow */
 
 /* This test documents an issue we used to have with merging the environment of
@@ -35,7 +35,7 @@ function foo() {
 "
 `;
 
-exports[`init.js 1`] = `
+exports[`init.js-flow 1`] = `
 "/***
  * test initialization tracking of hoisted stuff
  * @flow
@@ -344,7 +344,7 @@ function f(b) {
 "
 `;
 
-exports[`return.js 1`] = `
+exports[`return.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -477,7 +477,7 @@ function corge(): string {
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "/***
  * test env state tracking thru try/catch/finally
  * @flow
diff --git a/tests/flow/tuples/__snapshots__/jsfmt.spec.js.snap b/tests/flow/tuples/__snapshots__/jsfmt.spec.js.snap
index ad8242a2a..d60252c52 100644
--- a/tests/flow/tuples/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/tuples/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`array.js 1`] = `
+exports[`array.js-flow 1`] = `
 "// @flow
 
 function foo(x: Array<number>): [number, ?number] {
@@ -23,7 +23,7 @@ function foo(x: Array<number>): [number, ?number] {
 "
 `;
 
-exports[`optional.js 1`] = `
+exports[`optional.js-flow 1`] = `
 "// @flow
 
 ([0, undefined]: [number, ?string]); // Ok, correct arity
@@ -40,7 +40,7 @@ exports[`optional.js 1`] = `
 "
 `;
 
-exports[`too-few.js 1`] = `
+exports[`too-few.js-flow 1`] = `
 "/* @flow */
 
 function foo(a: [Object, Object]) {}
@@ -55,7 +55,7 @@ foo([{}]); // error, too few elements in array passed to a tuple
 "
 `;
 
-exports[`tuples.js 1`] = `
+exports[`tuples.js-flow 1`] = `
 "var a: [] = [];
 var b: [] = [123]; // Error - arity mismatch
 var c: [number] = []; // nope
diff --git a/tests/flow/type-at-pos/__snapshots__/jsfmt.spec.js.snap b/tests/flow/type-at-pos/__snapshots__/jsfmt.spec.js.snap
index 84dd2b203..1557a6731 100644
--- a/tests/flow/type-at-pos/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/type-at-pos/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`destructuring.js 1`] = `
+exports[`destructuring.js-flow 1`] = `
 "// @flow
 
 let [x, y] = [1, 2];
@@ -43,7 +43,7 @@ export const X = {
 "
 `;
 
-exports[`function_expressions.js 1`] = `
+exports[`function_expressions.js-flow 1`] = `
 "// @flow
 
 // TODO: type-at-pos between the ()'s should be () => void
@@ -68,7 +68,7 @@ const y = {
 "
 `;
 
-exports[`generics.js 1`] = `
+exports[`generics.js-flow 1`] = `
 "// @flow
 
 class C<X> { }
@@ -127,7 +127,7 @@ mn;
 "
 `;
 
-exports[`import.js 1`] = `
+exports[`import.js-flow 1`] = `
 "// @flow
 var num = 42;
 function bar() { }
@@ -142,7 +142,7 @@ module.exports = num;
 "
 `;
 
-exports[`object_special_cases.js 1`] = `
+exports[`object_special_cases.js-flow 1`] = `
 "/* @flow */
 
 let tests = [
@@ -163,7 +163,7 @@ let tests = [
 "
 `;
 
-exports[`optional.js 1`] = `
+exports[`optional.js-flow 1`] = `
 "// @flow
 
 function foo(x?: string) {
@@ -198,7 +198,7 @@ function qux(x?) {
 "
 `;
 
-exports[`predicates.js 1`] = `
+exports[`predicates.js-flow 1`] = `
 "/* @flow */
 
 let x = 0;
@@ -218,7 +218,7 @@ if (Array.isArray(x)) {
 "
 `;
 
-exports[`react.js 1`] = `
+exports[`react.js-flow 1`] = `
 "import React from \\"react\\";
 React.createElement;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -227,7 +227,7 @@ React.createElement;
 "
 `;
 
-exports[`templates.js 1`] = `
+exports[`templates.js-flow 1`] = `
 "/* @flow */
 \`foo bar\`;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -236,7 +236,7 @@ exports[`templates.js 1`] = `
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "// @flow
 var str = require('./import');
 function foo() { }
@@ -269,7 +269,7 @@ const w: MyNum = 42;
 "
 `;
 
-exports[`trycatch.js 1`] = `
+exports[`trycatch.js-flow 1`] = `
 "// @flow
 
 try {
diff --git a/tests/flow/type-destructors/__snapshots__/jsfmt.spec.js.snap b/tests/flow/type-destructors/__snapshots__/jsfmt.spec.js.snap
index 81bf2922a..1fe4997cd 100644
--- a/tests/flow/type-destructors/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/type-destructors/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`non_maybe_type.js 1`] = `
+exports[`non_maybe_type.js-flow 1`] = `
 "// @flow
 
 function foo(x: ?string): $NonMaybeType<?string> {
@@ -30,7 +30,7 @@ function foo(x: ?string): $NonMaybeType<?string> {
 "
 `;
 
-exports[`property_type.js 1`] = `
+exports[`property_type.js-flow 1`] = `
 "type Malformed = $PropertyType<any, number>;
 
 type Obj = { x: string };
@@ -57,7 +57,7 @@ function foo(o: Obj): $PropertyType<Obj, \\"x\\"> {
 "
 `;
 
-exports[`union.js 1`] = `
+exports[`union.js-flow 1`] = `
 "var x0: $NonMaybeType<number|string> = 0; // ok, number ~> number|string
 var x1: $NonMaybeType<number|string> = true; // err, boolean ~> number|string
 var x2: $PropertyType<{p:number}|{p:string},'p'> = 0; // ok, number ~> number|string
diff --git a/tests/flow/type-printer/__snapshots__/jsfmt.spec.js.snap b/tests/flow/type-printer/__snapshots__/jsfmt.spec.js.snap
index 235c4fd71..24828c7b4 100644
--- a/tests/flow/type-printer/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/type-printer/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`printBinaryExpression.js 1`] = `
+exports[`printBinaryExpression.js-flow 1`] = `
 "'use babel';
 /* @flow */
 
@@ -43,7 +43,7 @@ module.exports = printBinaryExpression;
 "
 `;
 
-exports[`types.js 1`] = `
+exports[`types.js-flow 1`] = `
 "/**
  * @flow
  */
diff --git a/tests/flow/type_args_nonstrict/__snapshots__/jsfmt.spec.js.snap b/tests/flow/type_args_nonstrict/__snapshots__/jsfmt.spec.js.snap
index 7c6d8407f..efa0f475f 100644
--- a/tests/flow/type_args_nonstrict/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/type_args_nonstrict/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "/**
  * Test nonstrict type param arity checking,
  * as enabled by
diff --git a/tests/flow/type_args_strict/__snapshots__/jsfmt.spec.js.snap b/tests/flow/type_args_strict/__snapshots__/jsfmt.spec.js.snap
index 120231d4b..e18476559 100644
--- a/tests/flow/type_args_strict/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/type_args_strict/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "/**
  * Test strict type param arity checking.
  *
diff --git a/tests/flow/type_only_vars/__snapshots__/jsfmt.spec.js.snap b/tests/flow/type_only_vars/__snapshots__/jsfmt.spec.js.snap
index 83e83b752..273bf10b1 100644
--- a/tests/flow/type_only_vars/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/type_only_vars/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`A.js 1`] = `
+exports[`A.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -31,7 +31,7 @@ module.exports = {
 "
 `;
 
-exports[`bad_shadowing.js 1`] = `
+exports[`bad_shadowing.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -72,7 +72,7 @@ var duck: string = \\"quack\\";
 "
 `;
 
-exports[`good_shadowing.js 1`] = `
+exports[`good_shadowing.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -117,7 +117,7 @@ var b: Foo = new A.Foo();
 "
 `;
 
-exports[`import_type.js 1`] = `
+exports[`import_type.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -156,7 +156,7 @@ var a: Foo = new actualA.Foo();
 "
 `;
 
-exports[`type_alias.js 1`] = `
+exports[`type_alias.js-flow 1`] = `
 "/**
  * @flow
  */
diff --git a/tests/flow/type_param_defaults/__snapshots__/jsfmt.spec.js.snap b/tests/flow/type_param_defaults/__snapshots__/jsfmt.spec.js.snap
index 8819ac4e9..80c2e3332 100644
--- a/tests/flow/type_param_defaults/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/type_param_defaults/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`classes.js 1`] = `
+exports[`classes.js-flow 1`] = `
 "/* @flow */
 
 class A<T> {
diff --git a/tests/flow/type_param_scope/__snapshots__/jsfmt.spec.js.snap b/tests/flow/type_param_scope/__snapshots__/jsfmt.spec.js.snap
index 8353f4618..0c3b87b55 100644
--- a/tests/flow/type_param_scope/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/type_param_scope/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`class.js 1`] = `
+exports[`class.js-flow 1`] = `
 "class C<T> {
   a<A>(x:T, a:A) {
     this.b(x); // ok
@@ -21,7 +21,7 @@ class C<T> {
 "
 `;
 
-exports[`default_params.js 1`] = `
+exports[`default_params.js-flow 1`] = `
 "function f<T>(a:T) {
   function g<U>(b:U, c:T = a) {
     function h(d:U = b) {}
@@ -50,7 +50,7 @@ f(0); // ok
 "
 `;
 
-exports[`method_shadow.js 1`] = `
+exports[`method_shadow.js-flow 1`] = `
 "// Ensure method type params properly shadow outer type params. Subclass ensures
 // the generated insttype has the correct tvars. Should behave the same for
 // classes, interfaces, and declared classes.
diff --git a/tests/flow/type_param_variance/__snapshots__/jsfmt.spec.js.snap b/tests/flow/type_param_variance/__snapshots__/jsfmt.spec.js.snap
index a42199cd4..ac4811969 100644
--- a/tests/flow/type_param_variance/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/type_param_variance/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`promise.js 1`] = `
+exports[`promise.js-flow 1`] = `
 "/**
  * At the moment, all type params are invariant with
  * the exception of the single param to the Promise class,
diff --git a/tests/flow/type_param_variance2/__snapshots__/jsfmt.spec.js.snap b/tests/flow/type_param_variance2/__snapshots__/jsfmt.spec.js.snap
index e4179252d..78e431c3f 100644
--- a/tests/flow/type_param_variance2/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/type_param_variance2/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`promise.js 1`] = `
+exports[`promise.js-flow 1`] = `
 "/**
  * Here the definition of Promise<T> is routed to the class Promise
  * in the user-specified library libs/Promise.js
diff --git a/tests/flow/type_param_variance2/libs/__snapshots__/jsfmt.spec.js.snap b/tests/flow/type_param_variance2/libs/__snapshots__/jsfmt.spec.js.snap
index 680f303fb..ed856f464 100644
--- a/tests/flow/type_param_variance2/libs/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/type_param_variance2/libs/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Promise.js 1`] = `
+exports[`Promise.js-flow 1`] = `
 "// Copyright 2004-present Facebook. All Rights Reserved.
 
 // These annotations are copy/pasted from the built-in Flow definitions for
diff --git a/tests/flow/typeapp_perf/__snapshots__/jsfmt.spec.js.snap b/tests/flow/typeapp_perf/__snapshots__/jsfmt.spec.js.snap
index 8ed5aa972..9db7d6d88 100644
--- a/tests/flow/typeapp_perf/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/typeapp_perf/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test1.js 1`] = `
+exports[`test1.js-flow 1`] = `
 "/* This test ensures that the code below does not take a long time to check. If
  * this test is taking a very long time to complete, there is a bug. */
 
@@ -45,7 +45,7 @@ declare var b: B<any>;
 "
 `;
 
-exports[`test2.js 1`] = `
+exports[`test2.js-flow 1`] = `
 "/* This test ensures that the code below does not take a long time to check. If
  * this test is taking a very long time to complete, there is a bug. */
 
diff --git a/tests/flow/typecast/__snapshots__/jsfmt.spec.js.snap b/tests/flow/typecast/__snapshots__/jsfmt.spec.js.snap
index 8b0911505..6cb4a57c7 100644
--- a/tests/flow/typecast/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/typecast/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`typecast.js 1`] = `
+exports[`typecast.js-flow 1`] = `
 "/**
  * Copyright 2004-present Facebook. All Rights Reserved.
  */
diff --git a/tests/flow/typeof/__snapshots__/jsfmt.spec.js.snap b/tests/flow/typeof/__snapshots__/jsfmt.spec.js.snap
index d32615f67..d38b76819 100644
--- a/tests/flow/typeof/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/typeof/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`typeof.js 1`] = `
+exports[`typeof.js-flow 1`] = `
 "/**
  * @flow
  */
diff --git a/tests/flow/unary/__snapshots__/jsfmt.spec.js.snap b/tests/flow/unary/__snapshots__/jsfmt.spec.js.snap
index e45116194..4026cec65 100644
--- a/tests/flow/unary/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/unary/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`unary.js 1`] = `
+exports[`unary.js-flow 1`] = `
 "/* @flow */
 
 function x0(y: string): number {
@@ -43,7 +43,7 @@ function x4(y: string): boolean {
 "
 `;
 
-exports[`update.js 1`] = `
+exports[`update.js-flow 1`] = `
 "// @flow
 
 let tests = [
diff --git a/tests/flow/unchecked_haste_module_vs_lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/unchecked_haste_module_vs_lib/__snapshots__/jsfmt.spec.js.snap
index 4e080e5c9..648cf9d26 100644
--- a/tests/flow/unchecked_haste_module_vs_lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/unchecked_haste_module_vs_lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`buffer.js 1`] = `
+exports[`buffer.js-flow 1`] = `
 "/**
  * @providesModule buffer
  *
@@ -29,7 +29,7 @@ export var INSPECT_MAX_BYTES = 0;
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "/**
  * Copyright 2004-present Facebook. All Rights Reserved.
  * @flow
diff --git a/tests/flow/unchecked_node_module_vs_lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/unchecked_node_module_vs_lib/__snapshots__/jsfmt.spec.js.snap
index b14bdf32e..b65c22f3a 100644
--- a/tests/flow/unchecked_node_module_vs_lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/unchecked_node_module_vs_lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "/**
  * Test resolution precedence in node:
  * checked module > lib def > unchecked module
diff --git a/tests/flow/undefined/__snapshots__/jsfmt.spec.js.snap b/tests/flow/undefined/__snapshots__/jsfmt.spec.js.snap
index 0a01d5739..cd8be8ed6 100644
--- a/tests/flow/undefined/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/undefined/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`issue-518.js 1`] = `
+exports[`issue-518.js-flow 1`] = `
 "function doSomethingAsync(): Promise<void> {
   return new Promise((resolve, reject) => {
     resolve(); // OK to leave out arg, same as resolve(undefined)
@@ -29,7 +29,7 @@ foo();
 "
 `;
 
-exports[`undefined.js 1`] = `
+exports[`undefined.js-flow 1`] = `
 "function foo() {
     var x;
     x.foo();
@@ -56,7 +56,7 @@ function qux(x?: number, y: string = \\"\\", z) {}
 "
 `;
 
-exports[`undefined2.js 1`] = `
+exports[`undefined2.js-flow 1`] = `
 "// @flow
 
 let tests = [
diff --git a/tests/flow/unicode/__snapshots__/jsfmt.spec.js.snap b/tests/flow/unicode/__snapshots__/jsfmt.spec.js.snap
index c1f814f2b..55bac34a7 100644
--- a/tests/flow/unicode/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/unicode/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`UnicodeUtils.js 1`] = `
+exports[`UnicodeUtils.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -72,7 +72,7 @@ function utf16Length(str, pos) {
 "
 `;
 
-exports[`keys.js 1`] = `
+exports[`keys.js-flow 1`] = `
 "({'この事はつもり素晴らしいことさ': '35jL9V'})
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 ({ \\"この事はつもり素晴らしいことさ\\": \\"35jL9V\\" });
diff --git a/tests/flow/union-intersection/__snapshots__/jsfmt.spec.js.snap b/tests/flow/union-intersection/__snapshots__/jsfmt.spec.js.snap
index e7fbe2880..6cdfd35c4 100644
--- a/tests/flow/union-intersection/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/union-intersection/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`gen_big_disjoint_union.js 1`] = `
+exports[`gen_big_disjoint_union.js-flow 1`] = `
 "// perf test for big disjoint union with 1000 cases
 type TAction =
 {
@@ -8013,7 +8013,7 @@ function foo(x: TAction): TAction {
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "type A = {a: number};
 type B = {b: number};
 type C = {c: number};
diff --git a/tests/flow/union/__snapshots__/jsfmt.spec.js.snap b/tests/flow/union/__snapshots__/jsfmt.spec.js.snap
index a3621719a..91f5bb17c 100644
--- a/tests/flow/union/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/union/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`fields.js 1`] = `
+exports[`fields.js-flow 1`] = `
 "class C {
     x: ?number|string;
     constructor() {
@@ -17,7 +17,7 @@ class C {
 "
 `;
 
-exports[`fields2.js 1`] = `
+exports[`fields2.js-flow 1`] = `
 "class C { }
 
 class D {
@@ -40,7 +40,7 @@ class D {
 "
 `;
 
-exports[`issue-17.js 1`] = `
+exports[`issue-17.js-flow 1`] = `
 "/* @flow */
 
 type T =
@@ -75,7 +75,7 @@ var l: Array<T> = [
 "
 `;
 
-exports[`issue-198.js 1`] = `
+exports[`issue-198.js-flow 1`] = `
 "var p = new Promise(function(resolve, reject) {
     resolve(5);
 })
@@ -100,7 +100,7 @@ var p = new Promise(function(resolve, reject) {
 "
 `;
 
-exports[`issue-256.js 1`] = `
+exports[`issue-256.js-flow 1`] = `
 "declare class Myclass {
     myfun(myarray: Array<Function | string>): any;
 }
@@ -119,7 +119,7 @@ myclass.myfun([\\"1\\", \\"2\\", \\"3\\", \\"4\\", \\"5\\", \\"6\\", \\"7\\", fu
 "
 `;
 
-exports[`issue-323.js 1`] = `
+exports[`issue-323.js-flow 1`] = `
 "var Foo = require(\\"./issue-323-lib\\");
 var foo = new Foo();
 var foostr: Foo | string = foo;
@@ -130,7 +130,7 @@ var foostr: Foo | string = foo;
 "
 `;
 
-exports[`issue-323-lib.js 1`] = `
+exports[`issue-323-lib.js-flow 1`] = `
 "/* @flow */
 class Foo {}
 module.exports = Foo;
@@ -141,7 +141,7 @@ module.exports = Foo;
 "
 `;
 
-exports[`issue-324.js 1`] = `
+exports[`issue-324.js-flow 1`] = `
 "/* @flow */
 class Foo{};
 class Bar{};
@@ -162,7 +162,7 @@ foostr = barstr;
 "
 `;
 
-exports[`issue-325.js 1`] = `
+exports[`issue-325.js-flow 1`] = `
 "class Tag {
     constructor() {
         var a1: Array<Tag|string> = [];
@@ -195,7 +195,7 @@ class Tag_ {
 "
 `;
 
-exports[`issue-326.js 1`] = `
+exports[`issue-326.js-flow 1`] = `
 "var numberAndStringArr:Array<number|string> = [1,2];
 var stringArr:Array<string> = ['a','b'];
 
@@ -208,7 +208,7 @@ var result = numberAndStringArr.concat(stringArr); // no error
 "
 `;
 
-exports[`issue-582.js 1`] = `
+exports[`issue-582.js-flow 1`] = `
 "/***
  * nested unions
  * @flow
@@ -241,7 +241,7 @@ var nested2: FooBarBaz = \\"baz\\";
 "
 `;
 
-exports[`issue-963.js 1`] = `
+exports[`issue-963.js-flow 1`] = `
 "/***
  * unions with embedded intersections
  * @flow
@@ -314,7 +314,7 @@ const u3: union2 = {
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "var C = require('test-lib');
 
 // TODO: spurious error! (replacing C with number makes the error go away)
@@ -357,7 +357,7 @@ bar(f);
 "
 `;
 
-exports[`test-lib.js 1`] = `
+exports[`test-lib.js-flow 1`] = `
 "/* @providesModule test-lib */
 
 class C { }
@@ -370,7 +370,7 @@ module.exports = C;
 "
 `;
 
-exports[`type-app.js 1`] = `
+exports[`type-app.js-flow 1`] = `
 "/**
  * @flow
  */
@@ -403,7 +403,7 @@ var b: Iterator<number> | number = 123;
 "
 `;
 
-exports[`union.js 1`] = `
+exports[`union.js-flow 1`] = `
 "function bar(x: Document | string): void { }
 bar(0);
 
@@ -450,7 +450,7 @@ function corge(b) {
 "
 `;
 
-exports[`yuge.js 1`] = `
+exports[`yuge.js-flow 1`] = `
 "/**
  * great big union used as type annotation will be flowed into itself.
  * List.mem check avoids pathology, as long as singletons aren't converted.
diff --git a/tests/flow/union_new/__snapshots__/jsfmt.spec.js.snap b/tests/flow/union_new/__snapshots__/jsfmt.spec.js.snap
index 00de0123a..66694aa28 100644
--- a/tests/flow/union_new/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/union_new/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`issue-815.js 1`] = `
+exports[`issue-815.js-flow 1`] = `
 "/* @flow */
 type T = A|B;
 class U {};
@@ -45,7 +45,7 @@ class VirtualNode {
 "
 `;
 
-exports[`issue-824.js 1`] = `
+exports[`issue-824.js-flow 1`] = `
 "import { B, C } from \\"./issue-824-helper\\";
 
 type K = B | C;
@@ -82,7 +82,7 @@ export default class A {
 "
 `;
 
-exports[`issue-824-helper.js 1`] = `
+exports[`issue-824-helper.js-flow 1`] = `
 "import A from \\"./issue-824\\";
 
 export class B extends A {
@@ -111,7 +111,7 @@ export class C extends A {
 "
 `;
 
-exports[`issue-1349.js 1`] = `
+exports[`issue-1349.js-flow 1`] = `
 "/* @flow */
 
 var bar: Array<{b: ?boolean, c: number} | {b: boolean}> = [
@@ -128,7 +128,7 @@ var bar: Array<{ b: ?boolean, c: number } | { b: boolean }> = [
 "
 `;
 
-exports[`issue-1371.js 1`] = `
+exports[`issue-1371.js-flow 1`] = `
 "function create(a: any): { type: 'B', data: number } | { type: 'A', data: string }
 {
   return {
@@ -148,7 +148,7 @@ function create(
 "
 `;
 
-exports[`issue-1455.js 1`] = `
+exports[`issue-1455.js-flow 1`] = `
 "/* @flow */
 import type {Foobar} from \\"./issue-1455-helper\\"
 
@@ -170,7 +170,7 @@ function node(content: ?Foobar | String | Array<String>) {
 "
 `;
 
-exports[`issue-1455-helper.js 1`] = `
+exports[`issue-1455-helper.js-flow 1`] = `
 "/* @flow */
 
 export class Foobar { }
@@ -181,7 +181,7 @@ export class Foobar {}
 "
 `;
 
-exports[`issue-1462-i.js 1`] = `
+exports[`issue-1462-i.js-flow 1`] = `
 "type Common = {
 };
 
@@ -229,7 +229,7 @@ function printAll(val: MyType) {
 "
 `;
 
-exports[`issue-1462-ii.js 1`] = `
+exports[`issue-1462-ii.js-flow 1`] = `
 "type Common = {
 };
 
@@ -290,7 +290,7 @@ function printAll(val: MyType) {
 "
 `;
 
-exports[`issue-1664.js 1`] = `
+exports[`issue-1664.js-flow 1`] = `
 "/* @flow */
 
 type DataBase = {
@@ -347,7 +347,7 @@ if (data.kind === \\"system\\") {
 "
 `;
 
-exports[`issue-1759.js 1`] = `
+exports[`issue-1759.js-flow 1`] = `
 "// @flow
 
 type X = ({a:true} & {b:string}) | ({a:false} & {c:string});
@@ -369,7 +369,7 @@ function hello(x: X): string {
 "
 `;
 
-exports[`issue-2232.js 1`] = `
+exports[`issue-2232.js-flow 1`] = `
 "/* @flow */
 
 declare type Entity<T> = {
@@ -421,7 +421,7 @@ function test(f: Foo | EmptyFoo) {
 "
 `;
 
-exports[`test1.js 1`] = `
+exports[`test1.js-flow 1`] = `
 "// @noflow
 
 /**
@@ -546,7 +546,7 @@ type A6 = B6[];
 "
 `;
 
-exports[`test2.js 1`] = `
+exports[`test2.js-flow 1`] = `
 "// @noflow
 
 /**
@@ -705,7 +705,7 @@ type B6 = string;
 "
 `;
 
-exports[`test3.js 1`] = `
+exports[`test3.js-flow 1`] = `
 "// @noflow
 
 /**
@@ -768,7 +768,7 @@ type B2 = string;
 "
 `;
 
-exports[`test4.js 1`] = `
+exports[`test4.js-flow 1`] = `
 "// @noflow
 
 /**
@@ -851,7 +851,7 @@ type B2 = string;
 "
 `;
 
-exports[`test5.js 1`] = `
+exports[`test5.js-flow 1`] = `
 "// @noflow
 
 /**
@@ -916,7 +916,7 @@ function arr_set(x: string, i: number) {
 "
 `;
 
-exports[`test6.js 1`] = `
+exports[`test6.js-flow 1`] = `
 "// @noflow
 
 /**
@@ -973,7 +973,7 @@ class C<X> {}
 "
 `;
 
-exports[`test7.js 1`] = `
+exports[`test7.js-flow 1`] = `
 "// @noflow
 
 /**
@@ -1036,7 +1036,7 @@ type PG<X> = { x: X, y?: PG<X> };
 "
 `;
 
-exports[`test8.js 1`] = `
+exports[`test8.js-flow 1`] = `
 "// @noflow
 
 /**
@@ -1087,7 +1087,7 @@ type H2_ = number;
 "
 `;
 
-exports[`test9.js 1`] = `
+exports[`test9.js-flow 1`] = `
 "// @noflow
 
 /**
@@ -1124,7 +1124,7 @@ foo((x): number => square(x));
 "
 `;
 
-exports[`test10.js 1`] = `
+exports[`test10.js-flow 1`] = `
 "// @noflow
 
 function id<X>(x: X): X { return x; }
@@ -1275,7 +1275,7 @@ check_poly_inst(new P());
 "
 `;
 
-exports[`test11.js 1`] = `
+exports[`test11.js-flow 1`] = `
 "// @noflow
 
 // disjoint unions
@@ -1315,7 +1315,7 @@ type Cons = { kind: \\"cons\\", next: List };
 "
 `;
 
-exports[`test12.js 1`] = `
+exports[`test12.js-flow 1`] = `
 "// @noflow
 
 // polymorphic recursive types
@@ -1340,7 +1340,7 @@ function rec(x: F<string>): G | H {
 "
 `;
 
-exports[`test13.js 1`] = `
+exports[`test13.js-flow 1`] = `
 "// @noflow
 
 /* ensure there are no unintended side effects when trying branches */
@@ -1369,7 +1369,7 @@ exports[`test13.js 1`] = `
 "
 `;
 
-exports[`test14.js 1`] = `
+exports[`test14.js-flow 1`] = `
 "// @noflow
 
 // annotations
@@ -1400,7 +1400,7 @@ function foo(c: C<number>) {
 "
 `;
 
-exports[`test15.js 1`] = `
+exports[`test15.js-flow 1`] = `
 "// @noflow
 
 // functions as objects
@@ -1453,7 +1453,7 @@ bar(() => {});
 "
 `;
 
-exports[`test16.js 1`] = `
+exports[`test16.js-flow 1`] = `
 "// @noflow
 
 // annotations
@@ -1496,7 +1496,7 @@ x = \\"\\";
 "
 `;
 
-exports[`test17.js 1`] = `
+exports[`test17.js-flow 1`] = `
 "// @noflow
 
 // Array#concat
@@ -1515,7 +1515,7 @@ exports[`test17.js 1`] = `
 "
 `;
 
-exports[`test18.js 1`] = `
+exports[`test18.js-flow 1`] = `
 "// @noflow
 
 // method overloads
@@ -1546,7 +1546,7 @@ new C().m(f());
 "
 `;
 
-exports[`test19.js 1`] = `
+exports[`test19.js-flow 1`] = `
 "// @noflow
 
 // constructor overloads
@@ -1575,7 +1575,7 @@ declare class D {
 "
 `;
 
-exports[`test20.js 1`] = `
+exports[`test20.js-flow 1`] = `
 "// @noflow
 
 // Array#reduce
@@ -1605,7 +1605,7 @@ exports[`test20.js 1`] = `
 "
 `;
 
-exports[`test21.js 1`] = `
+exports[`test21.js-flow 1`] = `
 "// @noflow
 
 // annotations for disjoint unions
@@ -1650,7 +1650,7 @@ function str() {
 "
 `;
 
-exports[`test22.js 1`] = `
+exports[`test22.js-flow 1`] = `
 "// @noflow
 
 // refinement of disjoint unions
@@ -1699,7 +1699,7 @@ function foo(x: T) {
 "
 `;
 
-exports[`test23.js 1`] = `
+exports[`test23.js-flow 1`] = `
 "// @noflow
 
 // nested intersections (see also lib/test23_lib.js)
@@ -1728,7 +1728,7 @@ function foo(obj: Obj) {
 "
 `;
 
-exports[`test24.js 1`] = `
+exports[`test24.js-flow 1`] = `
 "// @noflow
 
 // scaling test for full type resolution
@@ -1798,7 +1798,7 @@ declare class D extends C {
 "
 `;
 
-exports[`test25.js 1`] = `
+exports[`test25.js-flow 1`] = `
 "// @noflow
 
 // termination test (see also lib/test25_lib.js)
@@ -1826,7 +1826,7 @@ function foo(rows: Rows, set: Set<number>) {
 "
 `;
 
-exports[`test26.js 1`] = `
+exports[`test26.js-flow 1`] = `
 "// @noflow
 
 declare function foo(x: number): number;
@@ -1871,7 +1871,7 @@ new Record().set(\\"foo\\", \\"42\\");
 "
 `;
 
-exports[`test27.js 1`] = `
+exports[`test27.js-flow 1`] = `
 "// @noflow
 
 type X = ({a:true} & {b:string}) | ({a:false} & {c:string});
@@ -1926,7 +1926,7 @@ function hello4(x: X): string {
 "
 `;
 
-exports[`test29.js 1`] = `
+exports[`test29.js-flow 1`] = `
 "// @noflow
 
 // Make sure caching doesn't cause a spurious successful match (e.g., when a
@@ -1987,7 +1987,7 @@ class C {
 "
 `;
 
-exports[`test30.js 1`] = `
+exports[`test30.js-flow 1`] = `
 "// @noflow
 
 const Constants = require('./test30-helper');
@@ -2008,7 +2008,7 @@ type ActionType = { type: \\"foo\\", x: number } | { type: \\"bar\\", x: number
 "
 `;
 
-exports[`test30-helper.js 1`] = `
+exports[`test30-helper.js-flow 1`] = `
 "// @noflow
 
 module.exports = {
@@ -2025,7 +2025,7 @@ module.exports = {
 "
 `;
 
-exports[`test31.js 1`] = `
+exports[`test31.js-flow 1`] = `
 "// @noflow
 
 // make sure tuples are type arguments (as used e.g. when viewing maps as
@@ -2080,7 +2080,7 @@ function foo(): ImmutableMap<string, boolean> {
 "
 `;
 
-exports[`test32.js 1`] = `
+exports[`test32.js-flow 1`] = `
 "// @flow
 
 // make sure that full resolution jobs don't cache improperly to signal success
diff --git a/tests/flow/union_new/lib/__snapshots__/jsfmt.spec.js.snap b/tests/flow/union_new/lib/__snapshots__/jsfmt.spec.js.snap
index 678c14443..8abd23b14 100644
--- a/tests/flow/union_new/lib/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/union_new/lib/__snapshots__/jsfmt.spec.js.snap
@@ -1,13 +1,13 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test23_lib.js 1`] = `
+exports[`test23_lib.js-flow 1`] = `
 "declare class SomeLibClass { }
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 declare class SomeLibClass {}
 "
 `;
 
-exports[`test25_lib.js 1`] = `
+exports[`test25_lib.js-flow 1`] = `
 "declare class Set<T> {
     add(): Set<T>;
 }
@@ -54,7 +54,7 @@ declare class Rows {
 "
 `;
 
-exports[`test32_lib.js 1`] = `
+exports[`test32_lib.js-flow 1`] = `
 "type Indirect<T> = Array<T>;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 type Indirect<T> = Array<T>;
diff --git a/tests/flow/unreachable/__snapshots__/jsfmt.spec.js.snap b/tests/flow/unreachable/__snapshots__/jsfmt.spec.js.snap
index 58cac920d..28924839e 100644
--- a/tests/flow/unreachable/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/unreachable/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`typecheck.js 1`] = `
+exports[`typecheck.js-flow 1`] = `
 "/* @flow */
 
 function test1(): string {
@@ -51,7 +51,7 @@ function test2() {
 "
 `;
 
-exports[`unreachable.js 1`] = `
+exports[`unreachable.js-flow 1`] = `
 "/* @flow */
 
 function foo(x, y) {
diff --git a/tests/flow/value/__snapshots__/jsfmt.spec.js.snap b/tests/flow/value/__snapshots__/jsfmt.spec.js.snap
index da9c2fb8a..a8c7b8144 100644
--- a/tests/flow/value/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/value/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`value.js 1`] = `
+exports[`value.js-flow 1`] = `
 "var o = {};
 o[\\"x\\"] = 4;
 var y:string = o[\\"x\\"];
diff --git a/tests/flow/vim_emacs_errors/__snapshots__/jsfmt.spec.js.snap b/tests/flow/vim_emacs_errors/__snapshots__/jsfmt.spec.js.snap
index bb5e476dc..dcfd9207d 100644
--- a/tests/flow/vim_emacs_errors/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/vim_emacs_errors/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "// @flow
 
 (123: string);
diff --git a/tests/flow/weakmode/__snapshots__/jsfmt.spec.js.snap b/tests/flow/weakmode/__snapshots__/jsfmt.spec.js.snap
index 3558c5a73..92d6de4fe 100644
--- a/tests/flow/weakmode/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/weakmode/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`should_fail_without_weak.js 1`] = `
+exports[`should_fail_without_weak.js-flow 1`] = `
 "/* @flow */
 // This should fail without weak mode, because of the glaring type error.
 
@@ -25,7 +25,7 @@ function expects_an_int() {
 "
 `;
 
-exports[`should_pass_with_weak.js 1`] = `
+exports[`should_pass_with_weak.js-flow 1`] = `
 "/* @flow weak */
 // This should fail without weak mode, because of the glaring type error.
 
diff --git a/tests/flow/while/__snapshots__/jsfmt.spec.js.snap b/tests/flow/while/__snapshots__/jsfmt.spec.js.snap
index 0ccb2cd51..fb06b6c58 100644
--- a/tests/flow/while/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/while/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`abnormal.js 1`] = `
+exports[`abnormal.js-flow 1`] = `
 "/* @flow */
 
 function foo(x: boolean) {
@@ -45,7 +45,7 @@ function bar(x: boolean) {
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "class C {
     m() { return new C; }
 }
diff --git a/tests/flow/window/__snapshots__/jsfmt.spec.js.snap b/tests/flow/window/__snapshots__/jsfmt.spec.js.snap
index 50de50c1a..54c0aaa89 100644
--- a/tests/flow/window/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/window/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`window1.js 1`] = `
+exports[`window1.js-flow 1`] = `
 "/*
 @providesModule Window1
 */
@@ -13,7 +13,7 @@ module.exports = window.history;
 "
 `;
 
-exports[`window2.js 1`] = `
+exports[`window2.js-flow 1`] = `
 "/* @providesModule Window2 */
 
 module.exports = window.parent;
diff --git a/tests/flow/x/__snapshots__/jsfmt.spec.js.snap b/tests/flow/x/__snapshots__/jsfmt.spec.js.snap
index 0ed8994a3..f01259376 100644
--- a/tests/flow/x/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow/x/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`XControllerURIBuilder.js 1`] = `
+exports[`XControllerURIBuilder.js-flow 1`] = `
 "/**
  * @generated SignedSource<<13ca42bbc7fe91f15057861e18a77d88>>
  *
diff --git a/tests/flow_comments/__snapshots__/jsfmt.spec.js.snap b/tests/flow_comments/__snapshots__/jsfmt.spec.js.snap
index b4225c2bb..06a4c9bb6 100644
--- a/tests/flow_comments/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow_comments/__snapshots__/jsfmt.spec.js.snap
@@ -1,21 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`arrow.js 1`] = `
-"// Error
-const beep = (data/*: Object*/) => {}
-
-// OK
-const beep = (data/*: Object*/, secondData/*: Object*/) => {}
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-// Error
-const beep = (data: Object) => {};
-
-// OK
-const beep = (data: Object, secondData: Object) => {};
-"
-`;
-
-exports[`arrow.js 2`] = `
+exports[`arrow.js-babylon 1`] = `
 "// Error
 const beep = (data/*: Object*/) => {}
 
@@ -29,3 +14,18 @@ const beep = (data /*: Object*/) => {};
 const beep = (data /*: Object*/, secondData /*: Object*/) => {};
 "
 `;
+
+exports[`arrow.js-flow 1`] = `
+"// Error
+const beep = (data/*: Object*/) => {}
+
+// OK
+const beep = (data/*: Object*/, secondData/*: Object*/) => {}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+// Error
+const beep = (data: Object) => {};
+
+// OK
+const beep = (data: Object, secondData: Object) => {};
+"
+`;
diff --git a/tests/flow_generic/__snapshots__/jsfmt.spec.js.snap b/tests/flow_generic/__snapshots__/jsfmt.spec.js.snap
index 65d1bee9e..4c87e092f 100644
--- a/tests/flow_generic/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow_generic/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`break.js 1`] = `
+exports[`break.js-flow 1`] = `
 "var X = {
   perform: function<    
      A, B, C, D, E, F, G,     
diff --git a/tests/flow_method/__snapshots__/jsfmt.spec.js.snap b/tests/flow_method/__snapshots__/jsfmt.spec.js.snap
index 56a65ecc8..355a072b6 100644
--- a/tests/flow_method/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow_method/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`comment.js 1`] = `
+exports[`comment.js-flow 1`] = `
 "type Foo = {
   method(
     arg: number, // I belong with baz
@@ -17,7 +17,7 @@ type Foo = {
 "
 `;
 
-exports[`method.js 1`] = `
+exports[`method.js-flow 1`] = `
 "type T = { method: () => void };
 type T = { method(): void };
 declare class X { method(): void }
diff --git a/tests/flow_object_comment/__snapshots__/jsfmt.spec.js.snap b/tests/flow_object_comment/__snapshots__/jsfmt.spec.js.snap
index 1314cca0a..873f44bda 100644
--- a/tests/flow_object_comment/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/flow_object_comment/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`flow_object_comment.js 1`] = `
+exports[`flow_object_comment.js-flow 1`] = `
 "export default (
   {
     foo,
diff --git a/tests/for/__snapshots__/jsfmt.spec.js.snap b/tests/for/__snapshots__/jsfmt.spec.js.snap
index d9a722cae..13e299b41 100644
--- a/tests/for/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/for/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`comment.js 1`] = `
+exports[`comment.js-flow 1`] = `
 "for (x
 /*a*/
 in //b
@@ -67,7 +67,7 @@ for (x of y);
 "
 `;
 
-exports[`comment.js 2`] = `
+exports[`comment.js-typescript 1`] = `
 "for (x
 /*a*/
 in //b
@@ -134,7 +134,7 @@ for (x of y);
 "
 `;
 
-exports[`for.js 1`] = `
+exports[`for.js-flow 1`] = `
 "for (;;) {}
 for (var i = 0; i < 10; ++i) {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -145,7 +145,7 @@ for (var i = 0; i < 10; ++i) {
 "
 `;
 
-exports[`for.js 2`] = `
+exports[`for.js-typescript 1`] = `
 "for (;;) {}
 for (var i = 0; i < 10; ++i) {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -156,7 +156,7 @@ for (var i = 0; i < 10; ++i) {
 "
 `;
 
-exports[`in.js 1`] = `
+exports[`in.js-flow 1`] = `
 "for ((x in a);;) {}
 for (a=(a in b);;) {}
 for (let a = (b in c); ; );
@@ -185,7 +185,7 @@ async function f() {
 "
 `;
 
-exports[`in.js 2`] = `
+exports[`in.js-typescript 1`] = `
 "for ((x in a);;) {}
 for (a=(a in b);;) {}
 for (let a = (b in c); ; );
@@ -214,7 +214,7 @@ async function f() {
 "
 `;
 
-exports[`var.js 1`] = `
+exports[`var.js-flow 1`] = `
 "for (a in b) var c = {}; [];
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 for (a in b)
@@ -223,7 +223,7 @@ for (a in b)
 "
 `;
 
-exports[`var.js 2`] = `
+exports[`var.js-typescript 1`] = `
 "for (a in b) var c = {}; [];
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 for (a in b)
diff --git a/tests/function/__snapshots__/jsfmt.spec.js.snap b/tests/function/__snapshots__/jsfmt.spec.js.snap
index e5d39150b..7a9386802 100644
--- a/tests/function/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/function/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`function_expression.js 1`] = `
+exports[`function_expression.js-flow 1`] = `
 "(function() {}).length
 typeof (function() {});
 export default (function() {})();
@@ -27,7 +27,7 @@ new function() {}();
 "
 `;
 
-exports[`function_expression.js 2`] = `
+exports[`function_expression.js-typescript 1`] = `
 "(function() {}).length
 typeof (function() {});
 export default (function() {})();
diff --git a/tests/if/__snapshots__/jsfmt.spec.js.snap b/tests/if/__snapshots__/jsfmt.spec.js.snap
index a961d8bfc..4c5cb73aa 100644
--- a/tests/if/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/if/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`else.js 1`] = `
+exports[`else.js-flow 1`] = `
 "// Both functions below should be formatted exactly the same
 
 function f() {
@@ -42,7 +42,7 @@ function f() {
 "
 `;
 
-exports[`else.js 2`] = `
+exports[`else.js-typescript 1`] = `
 "// Both functions below should be formatted exactly the same
 
 function f() {
@@ -84,7 +84,7 @@ function f() {
 "
 `;
 
-exports[`if_comments.js 1`] = `
+exports[`if_comments.js-flow 1`] = `
 "async function f() {
   if (untrackedChoice === 0) /* Cancel */ {
     return null;
@@ -158,7 +158,7 @@ async function f() {
 "
 `;
 
-exports[`if_comments.js 2`] = `
+exports[`if_comments.js-typescript 1`] = `
 "async function f() {
   if (untrackedChoice === 0) /* Cancel */ {
     return null;
diff --git a/tests/ignore/__snapshots__/jsfmt.spec.js.snap b/tests/ignore/__snapshots__/jsfmt.spec.js.snap
index 8c530fdae..2a4d737b1 100644
--- a/tests/ignore/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/ignore/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`ignore.js 1`] = `
+exports[`ignore.js-flow 1`] = `
 "function a() {
   // prettier-ignore
   var fnString =
diff --git a/tests/import/__snapshots__/jsfmt.spec.js.snap b/tests/import/__snapshots__/jsfmt.spec.js.snap
index d35e1dc29..4c24cd3f1 100644
--- a/tests/import/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/import/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`brackets.js 1`] = `
+exports[`brackets.js-flow 1`] = `
 "import {
   runTaskForChanged,
   description,
@@ -27,7 +27,7 @@ import { fitsIn, oneLine } from \\".\\";
 "
 `;
 
-exports[`brackets.js 2`] = `
+exports[`brackets.js-flow 2`] = `
 "import {
   runTaskForChanged,
   description,
@@ -54,7 +54,7 @@ import {fitsIn, oneLine} from \\".\\";
 "
 `;
 
-exports[`brackets.js 3`] = `
+exports[`brackets.js-typescript 1`] = `
 "import {
   runTaskForChanged,
   description,
@@ -81,7 +81,7 @@ import { fitsIn, oneLine } from \\".\\";
 "
 `;
 
-exports[`brackets.js 4`] = `
+exports[`brackets.js-typescript 2`] = `
 "import {
   runTaskForChanged,
   description,
@@ -108,7 +108,7 @@ import {fitsIn, oneLine} from \\".\\";
 "
 `;
 
-exports[`comments.js 1`] = `
+exports[`comments.js-flow 1`] = `
 "import { a //comment1
 //comment2
 //comment3
@@ -179,7 +179,7 @@ import {
 "
 `;
 
-exports[`comments.js 2`] = `
+exports[`comments.js-flow 2`] = `
 "import { a //comment1
 //comment2
 //comment3
@@ -250,7 +250,7 @@ import {
 "
 `;
 
-exports[`comments.js 3`] = `
+exports[`comments.js-typescript 1`] = `
 "import { a //comment1
 //comment2
 //comment3
@@ -321,7 +321,7 @@ import {
 "
 `;
 
-exports[`comments.js 4`] = `
+exports[`comments.js-typescript 2`] = `
 "import { a //comment1
 //comment2
 //comment3
@@ -392,7 +392,7 @@ import {
 "
 `;
 
-exports[`long-line.js 1`] = `
+exports[`long-line.js-flow 1`] = `
 "import someCoolUtilWithARatherLongName from '../../../../utils/someCoolUtilWithARatherLongName';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 import someCoolUtilWithARatherLongName
@@ -400,7 +400,7 @@ import someCoolUtilWithARatherLongName
 "
 `;
 
-exports[`long-line.js 2`] = `
+exports[`long-line.js-flow 2`] = `
 "import someCoolUtilWithARatherLongName from '../../../../utils/someCoolUtilWithARatherLongName';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 import someCoolUtilWithARatherLongName
@@ -408,7 +408,7 @@ import someCoolUtilWithARatherLongName
 "
 `;
 
-exports[`long-line.js 3`] = `
+exports[`long-line.js-typescript 1`] = `
 "import someCoolUtilWithARatherLongName from '../../../../utils/someCoolUtilWithARatherLongName';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 import someCoolUtilWithARatherLongName
@@ -416,7 +416,7 @@ import someCoolUtilWithARatherLongName
 "
 `;
 
-exports[`long-line.js 4`] = `
+exports[`long-line.js-typescript 2`] = `
 "import someCoolUtilWithARatherLongName from '../../../../utils/someCoolUtilWithARatherLongName';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 import someCoolUtilWithARatherLongName
@@ -424,28 +424,28 @@ import someCoolUtilWithARatherLongName
 "
 `;
 
-exports[`multiple_standalones.js 1`] = `
+exports[`multiple_standalones.js-flow 1`] = `
 "import a, * as b from 'a';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 import a, * as b from \\"a\\";
 "
 `;
 
-exports[`multiple_standalones.js 2`] = `
+exports[`multiple_standalones.js-flow 2`] = `
 "import a, * as b from 'a';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 import a, * as b from \\"a\\";
 "
 `;
 
-exports[`multiple_standalones.js 3`] = `
+exports[`multiple_standalones.js-typescript 1`] = `
 "import a, * as b from 'a';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 import a, * as b from \\"a\\";
 "
 `;
 
-exports[`multiple_standalones.js 4`] = `
+exports[`multiple_standalones.js-typescript 2`] = `
 "import a, * as b from 'a';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 import a, * as b from \\"a\\";
diff --git a/tests/interface/__snapshots__/jsfmt.spec.js.snap b/tests/interface/__snapshots__/jsfmt.spec.js.snap
index bcdda38e9..ab707bf9a 100644
--- a/tests/interface/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/interface/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`module.js 1`] = `
+exports[`module.js-flow 1`] = `
 "declare module X {
   declare interface Y { x: number; }
 }
diff --git a/tests/jsx-multiline-assign/__snapshots__/jsfmt.spec.js.snap b/tests/jsx-multiline-assign/__snapshots__/jsfmt.spec.js.snap
index f3c81c431..996fdda66 100644
--- a/tests/jsx-multiline-assign/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/jsx-multiline-assign/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "const comp1 = (
   <div style={styles} key=\\"something\\">
     Keep the wrapping parens.
@@ -53,7 +53,7 @@ const comp5 = <div>Keep it on one line.</div>;
 "
 `;
 
-exports[`test.js 2`] = `
+exports[`test.js-typescript 1`] = `
 "const comp1 = (
   <div style={styles} key=\\"something\\">
     Keep the wrapping parens.
diff --git a/tests/jsx-newlines/__snapshots__/jsfmt.spec.js.snap b/tests/jsx-newlines/__snapshots__/jsfmt.spec.js.snap
index 74e727aa2..70b72d245 100644
--- a/tests/jsx-newlines/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/jsx-newlines/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "keep = <p>
   Welcome to the <strong>Universal React Starter-kyt</strong>.
   This starter kyt should serve as the base for an advanced,
@@ -188,7 +188,7 @@ regression_extra_newline_2 = (
 "
 `;
 
-exports[`test.js 2`] = `
+exports[`test.js-typescript 1`] = `
 "keep = <p>
   Welcome to the <strong>Universal React Starter-kyt</strong>.
   This starter kyt should serve as the base for an advanced,
diff --git a/tests/jsx-significant-space/__snapshots__/jsfmt.spec.js.snap b/tests/jsx-significant-space/__snapshots__/jsfmt.spec.js.snap
index 301b52b6d..43d298642 100644
--- a/tests/jsx-significant-space/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/jsx-significant-space/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "after =
   <span>
       foo <span>bar</span>
@@ -199,7 +199,7 @@ not_broken_begin = (
 "
 `;
 
-exports[`test.js 2`] = `
+exports[`test.js-typescript 1`] = `
 "after =
   <span>
       foo <span>bar</span>
diff --git a/tests/jsx-split-attrs/__snapshots__/jsfmt.spec.js.snap b/tests/jsx-split-attrs/__snapshots__/jsfmt.spec.js.snap
index 4b1f99702..b82e5baf9 100644
--- a/tests/jsx-split-attrs/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/jsx-split-attrs/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "long_closed =
   <BaseForm url=\\"/auth/google\\" method=\\"GET\\" colour=\\"blue\\" size=\\"large\\" submitLabel=\\"Sign in with Google\\"/>
 
@@ -213,7 +213,7 @@ long_obj = (
 "
 `;
 
-exports[`test.js 2`] = `
+exports[`test.js-typescript 1`] = `
 "long_closed =
   <BaseForm url=\\"/auth/google\\" method=\\"GET\\" colour=\\"blue\\" size=\\"large\\" submitLabel=\\"Sign in with Google\\"/>
 
diff --git a/tests/jsx-stateless-arrow-fn/__snapshots__/jsfmt.spec.js.snap b/tests/jsx-stateless-arrow-fn/__snapshots__/jsfmt.spec.js.snap
index 953856572..36430f9b8 100644
--- a/tests/jsx-stateless-arrow-fn/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/jsx-stateless-arrow-fn/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "const render1 = ({ styles }) => (
   <div style={styles} key=\\"something\\">
     Keep the wrapping parens. Put each key on its own line.
@@ -233,7 +233,7 @@ const renderTernary = props => (
 "
 `;
 
-exports[`test.js 2`] = `
+exports[`test.js-typescript 1`] = `
 "const render1 = ({ styles }) => (
   <div style={styles} key=\\"something\\">
     Keep the wrapping parens. Put each key on its own line.
diff --git a/tests/jsx/__snapshots__/jsfmt.spec.js.snap b/tests/jsx/__snapshots__/jsfmt.spec.js.snap
index a24d5d571..ef8c80580 100644
--- a/tests/jsx/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/jsx/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`expression.js 1`] = `
+exports[`expression.js-flow 1`] = `
 "<View
   style={
     {
@@ -139,7 +139,7 @@ exports[`expression.js 1`] = `
 "
 `;
 
-exports[`expression.js 2`] = `
+exports[`expression.js-typescript 1`] = `
 "<View
   style={
     {
@@ -278,7 +278,7 @@ exports[`expression.js 2`] = `
 "
 `;
 
-exports[`hug.js 1`] = `
+exports[`hug.js-flow 1`] = `
 "<div>
   {__DEV__
     ? this.renderDevApp()
@@ -348,7 +348,7 @@ exports[`hug.js 1`] = `
 "
 `;
 
-exports[`hug.js 2`] = `
+exports[`hug.js-typescript 1`] = `
 "<div>
   {__DEV__
     ? this.renderDevApp()
@@ -418,7 +418,7 @@ exports[`hug.js 2`] = `
 "
 `;
 
-exports[`object-property.js 1`] = `
+exports[`object-property.js-flow 1`] = `
 "const tabs = [
   {
     title: \\"General Info\\",
@@ -449,7 +449,7 @@ const tabs = [
 "
 `;
 
-exports[`object-property.js 2`] = `
+exports[`object-property.js-typescript 1`] = `
 "const tabs = [
   {
     title: \\"General Info\\",
@@ -480,7 +480,7 @@ const tabs = [
 "
 `;
 
-exports[`open-break.js 1`] = `
+exports[`open-break.js-flow 1`] = `
 "<td
 onClick={() => {
   a
@@ -510,7 +510,7 @@ onClick={() => {
 "
 `;
 
-exports[`open-break.js 2`] = `
+exports[`open-break.js-typescript 1`] = `
 "<td
 onClick={() => {
   a
@@ -540,7 +540,7 @@ onClick={() => {
 "
 `;
 
-exports[`parens.js 1`] = `
+exports[`parens.js-flow 1`] = `
 "a = [
   <path
     key='0'
@@ -569,7 +569,7 @@ a = [
 "
 `;
 
-exports[`parens.js 2`] = `
+exports[`parens.js-typescript 1`] = `
 "a = [
   <path
     key='0'
@@ -598,7 +598,7 @@ a = [
 "
 `;
 
-exports[`quotes.js 1`] = `
+exports[`quotes.js-flow 1`] = `
 "<div id=\\"&quot;'<>&amp;quot;\\" />;
 <div id='\\"&#39;<>&amp;quot;' />;
 <div id={'\\\\'\\"&quot;<>&amp;quot;'} />;
@@ -609,7 +609,7 @@ exports[`quotes.js 1`] = `
 "
 `;
 
-exports[`quotes.js 2`] = `
+exports[`quotes.js-typescript 1`] = `
 "<div id=\\"&quot;'<>&amp;quot;\\" />;
 <div id='\\"&#39;<>&amp;quot;' />;
 <div id={'\\\\'\\"&quot;<>&amp;quot;'} />;
diff --git a/tests/jsx_escape/__snapshots__/jsfmt.spec.js.snap b/tests/jsx_escape/__snapshots__/jsfmt.spec.js.snap
index 2f56656cb..3f6056f99 100644
--- a/tests/jsx_escape/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/jsx_escape/__snapshots__/jsfmt.spec.js.snap
@@ -1,37 +1,20 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`escape.js 1`] = `
+exports[`escape.js-babylon 1`] = `
 "<div>&lt;</div>
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 <div>&lt;</div>;
 "
 `;
 
-exports[`escape.js 2`] = `
+exports[`escape.js-flow 1`] = `
 "<div>&lt;</div>
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 <div>&lt;</div>;
 "
 `;
 
-exports[`nbsp.js 1`] = `
-"many_nbsp = <div>&nbsp; &nbsp; </div>
-single_nbsp = <div>&nbsp;</div>
-many_raw_nbsp = <div>   </div>
-
-
-amp = <span>foo &amp; bar</span>
-raw_amp = <span>foo & bar</span>
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-many_nbsp = <div>&nbsp; &nbsp; </div>;
-single_nbsp = <div>&nbsp;</div>;
-many_raw_nbsp = <div>&nbsp;&nbsp;&nbsp;</div>;
-amp = <span>foo &amp; bar</span>;
-raw_amp = <span>foo & bar</span>;
-"
-`;
-
-exports[`nbsp.js 2`] = `
+exports[`nbsp.js-babylon 1`] = `
 "many_nbsp = <div>&nbsp; &nbsp; </div>
 single_nbsp = <div>&nbsp;</div>
 many_raw_nbsp = <div>   </div>
@@ -48,3 +31,20 @@ amp = <span>foo & bar</span>;
 raw_amp = <span>foo & bar</span>;
 "
 `;
+
+exports[`nbsp.js-flow 1`] = `
+"many_nbsp = <div>&nbsp; &nbsp; </div>
+single_nbsp = <div>&nbsp;</div>
+many_raw_nbsp = <div>   </div>
+
+
+amp = <span>foo &amp; bar</span>
+raw_amp = <span>foo & bar</span>
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+many_nbsp = <div>&nbsp; &nbsp; </div>;
+single_nbsp = <div>&nbsp;</div>;
+many_raw_nbsp = <div>&nbsp;&nbsp;&nbsp;</div>;
+amp = <span>foo &amp; bar</span>;
+raw_amp = <span>foo & bar</span>;
+"
+`;
diff --git a/tests/jsx_last_line/__snapshots__/jsfmt.spec.js.snap b/tests/jsx_last_line/__snapshots__/jsfmt.spec.js.snap
index d56dd3e59..120d3bbe6 100644
--- a/tests/jsx_last_line/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/jsx_last_line/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`last_line.js 1`] = `
+exports[`last_line.js-flow 1`] = `
 "<SomeHighlyConfiguredComponent
   onEnter={this.onEnter}
   onLeave={this.onLeave}
@@ -24,7 +24,7 @@ exports[`last_line.js 1`] = `
 "
 `;
 
-exports[`last_line.js 2`] = `
+exports[`last_line.js-flow 2`] = `
 "<SomeHighlyConfiguredComponent
   onEnter={this.onEnter}
   onLeave={this.onLeave}
@@ -49,7 +49,7 @@ exports[`last_line.js 2`] = `
 "
 `;
 
-exports[`last_line.js 3`] = `
+exports[`last_line.js-typescript 1`] = `
 "<SomeHighlyConfiguredComponent
   onEnter={this.onEnter}
   onLeave={this.onLeave}
@@ -73,7 +73,7 @@ exports[`last_line.js 3`] = `
 "
 `;
 
-exports[`last_line.js 4`] = `
+exports[`last_line.js-typescript 2`] = `
 "<SomeHighlyConfiguredComponent
   onEnter={this.onEnter}
   onLeave={this.onLeave}
diff --git a/tests/label/__snapshots__/jsfmt.spec.js.snap b/tests/label/__snapshots__/jsfmt.spec.js.snap
index 179cda189..a0eab8562 100644
--- a/tests/label/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/label/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`empty_label.js 1`] = `
+exports[`empty_label.js-flow 1`] = `
 "a:;
 b
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -9,7 +9,7 @@ b;
 "
 `;
 
-exports[`empty_label.js 2`] = `
+exports[`empty_label.js-typescript 1`] = `
 "a:;
 b
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/last_argument_expansion/__snapshots__/jsfmt.spec.js.snap b/tests/last_argument_expansion/__snapshots__/jsfmt.spec.js.snap
index a814bab1d..9b54fb615 100644
--- a/tests/last_argument_expansion/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/last_argument_expansion/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`arrow.js 1`] = `
+exports[`arrow.js-flow 1`] = `
 "export default function searchUsers(action$) {
   return action$.ofType(ActionTypes.SEARCHED_USERS)
     .map(action => action.payload.query)
@@ -37,7 +37,7 @@ export default function searchUsers(action$) {
 "
 `;
 
-exports[`break-parent.js 1`] = `
+exports[`break-parent.js-flow 1`] = `
 "({
   processors: [
     require(\\"autoprefixer\\", {
@@ -92,7 +92,7 @@ true
 "
 `;
 
-exports[`jsx.js 1`] = `
+exports[`jsx.js-flow 1`] = `
 "const els = items.map(item => (
   <div className=\\"whatever\\">
     <span>{children}</span>
@@ -107,7 +107,7 @@ const els = items.map(item => (
 "
 `;
 
-exports[`object.js 1`] = `
+exports[`object.js-flow 1`] = `
 "const formatData = pipe(
   zip,
   map(([ ref, data ]) => ({
@@ -150,7 +150,7 @@ export const log = y => {
 "
 `;
 
-exports[`overflow.js 1`] = `
+exports[`overflow.js-flow 1`] = `
 "SuperSuperSuperSuperSuperSuperSuperSuperSuperSuperSuperSuperLongCall((err, result) => {
   // comment
 });
diff --git a/tests/line/__snapshots__/jsfmt.spec.js.snap b/tests/line/__snapshots__/jsfmt.spec.js.snap
index 6d76a8fbf..0d18cb358 100644
--- a/tests/line/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/line/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`windows.js 1`] = `
+exports[`windows.js-flow 1`] = `
 "const vscode = require(\\"vscode\\");
 const {getDir, getActiveFile, uint8arrayToString} = require(\\"./utils\\");
 
@@ -15,7 +15,7 @@ let _commands;
 "
 `;
 
-exports[`windows.js 2`] = `
+exports[`windows.js-typescript 1`] = `
 "const vscode = require(\\"vscode\\");
 const {getDir, getActiveFile, uint8arrayToString} = require(\\"./utils\\");
 
diff --git a/tests/line_suffix_boundary/__snapshots__/jsfmt.spec.js.snap b/tests/line_suffix_boundary/__snapshots__/jsfmt.spec.js.snap
index e4fc91e72..b8b00c559 100644
--- a/tests/line_suffix_boundary/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/line_suffix_boundary/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`boundary.js 1`] = `
+exports[`boundary.js-babylon 1`] = `
 "\`\${
 a +  // a
   a
@@ -51,7 +51,7 @@ ExampleStory.getFragment(\\"story\\")}
 "
 `;
 
-exports[`boundary.js 2`] = `
+exports[`boundary.js-flow 1`] = `
 "\`\${
 a +  // a
   a
diff --git a/tests/literal/__snapshots__/jsfmt.spec.js.snap b/tests/literal/__snapshots__/jsfmt.spec.js.snap
index 19f45910d..e651ec414 100644
--- a/tests/literal/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/literal/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`number.js 1`] = `
+exports[`number.js-babylon 1`] = `
 "// parentheses around numeric literal should be preserved
 function test5(): string {
   return (100).toString();
diff --git a/tests/member/__snapshots__/jsfmt.spec.js.snap b/tests/member/__snapshots__/jsfmt.spec.js.snap
index 4263d57b0..2a4d5b9d6 100644
--- a/tests/member/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/member/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`expand.js 1`] = `
+exports[`expand.js-flow 1`] = `
 "const veryVeryVeryVeryVeryVeryVeryLong = doc.expandedStates[doc.expandedStates.length - 1];
 const small = doc.expandedStates[doc.expandedStates.length - 1];~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 const veryVeryVeryVeryVeryVeryVeryLong = doc.expandedStates[
@@ -10,7 +10,7 @@ const small = doc.expandedStates[doc.expandedStates.length - 1];
 "
 `;
 
-exports[`expand.js 2`] = `
+exports[`expand.js-typescript 1`] = `
 "const veryVeryVeryVeryVeryVeryVeryLong = doc.expandedStates[doc.expandedStates.length - 1];
 const small = doc.expandedStates[doc.expandedStates.length - 1];~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 const veryVeryVeryVeryVeryVeryVeryLong = doc.expandedStates[
diff --git a/tests/method-chain/__snapshots__/jsfmt.spec.js.snap b/tests/method-chain/__snapshots__/jsfmt.spec.js.snap
index c781d2068..ac497142f 100644
--- a/tests/method-chain/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/method-chain/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`break-last-call.js 1`] = `
+exports[`break-last-call.js-flow 1`] = `
 "export default store => {
   return callApi(endpoint, schema).then(
     response => next(actionWith({
@@ -119,7 +119,7 @@ it(\\"should group messages with same created time\\", () => {
 "
 `;
 
-exports[`comment.js 1`] = `
+exports[`comment.js-flow 1`] = `
 "function f() {
   return observableFromSubscribeFunction()
     // Debounce manually rather than using editor.onDidStopChanging so that the debounce time is
@@ -163,7 +163,7 @@ _.a(
 "
 `;
 
-exports[`first_long.js 1`] = `
+exports[`first_long.js-flow 1`] = `
 "export default function theFunction(action$, store) {
   return action$.ofType(THE_ACTION).switchMap(action => Observable
     .webSocket({
@@ -234,7 +234,7 @@ function f() {
 "
 `;
 
-exports[`inline_merge.js 1`] = `
+exports[`inline_merge.js-flow 1`] = `
 "Object.keys(
   availableLocales({
     test: true
@@ -254,7 +254,7 @@ Object.keys(
 "
 `;
 
-exports[`logical.js 1`] = `
+exports[`logical.js-flow 1`] = `
 "(veryLongVeryLongVeryLong || e).map(tickets =>
   TicketRecord.createFromSomeLongString());
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -263,7 +263,7 @@ exports[`logical.js 1`] = `
 "
 `;
 
-exports[`multiple-members.js 1`] = `
+exports[`multiple-members.js-flow 1`] = `
 "if (testConfig.ENABLE_ONLINE_TESTS === \\"true\\") {
   describe(\\"POST /users/me/pet\\", function() {
     it(\\"saves pet\\", function() {
@@ -300,7 +300,7 @@ if (testConfig.ENABLE_ONLINE_TESTS === \\"true\\") {
 "
 `;
 
-exports[`square_0.js 1`] = `
+exports[`square_0.js-flow 1`] = `
 "const version = someLongString
   .split('jest version =')
   .pop()
@@ -315,7 +315,7 @@ const version = someLongString
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "method().then(x => x)
   [\\"abc\\"](x => x)
   [abc](x => x);
@@ -330,7 +330,7 @@ method().then(x => x)[\\"abc\\"](x => x)[abc](x => x);
 "
 `;
 
-exports[`this.js 1`] = `
+exports[`this.js-flow 1`] = `
 "const sel = this.connections
   .concat(this.activities.concat(this.operators))
   .filter(x => x.selected);
diff --git a/tests/new_expression/__snapshots__/jsfmt.spec.js.snap b/tests/new_expression/__snapshots__/jsfmt.spec.js.snap
index 1445f2e48..d1bb0cc4c 100644
--- a/tests/new_expression/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/new_expression/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`new_expression.js 1`] = `
+exports[`new_expression.js-flow 1`] = `
 "new (memoize.Cache || MapCache)
 new (typeof this == \\"function\\" ? this : Dict())
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -9,7 +9,7 @@ new (typeof this == \\"function\\" ? this : Dict())();
 "
 `;
 
-exports[`new_expression.js 2`] = `
+exports[`new_expression.js-typescript 1`] = `
 "new (memoize.Cache || MapCache)
 new (typeof this == \\"function\\" ? this : Dict())
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/object-prop-break-in/__snapshots__/jsfmt.spec.js.snap b/tests/object-prop-break-in/__snapshots__/jsfmt.spec.js.snap
index 8227b17ad..4d1fd85e7 100644
--- a/tests/object-prop-break-in/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/object-prop-break-in/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`comment.js 1`] = `
+exports[`comment.js-flow 1`] = `
 "function foo() {
   return {
     // this comment causes the problem
@@ -17,7 +17,7 @@ function foo() {
 "
 `;
 
-exports[`comment.js 2`] = `
+exports[`comment.js-typescript 1`] = `
 "function foo() {
   return {
     // this comment causes the problem
@@ -34,7 +34,7 @@ function foo() {
 "
 `;
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "const a = classnames({
   \\"some-prop\\": this.state.longLongLongLongLongLongLongLongLongTooLongProp
 });
@@ -95,7 +95,7 @@ const g = classnames({
 "
 `;
 
-exports[`test.js 2`] = `
+exports[`test.js-typescript 1`] = `
 "const a = classnames({
   \\"some-prop\\": this.state.longLongLongLongLongLongLongLongLongTooLongProp
 });
diff --git a/tests/object_colon_bug/__snapshots__/jsfmt.spec.js.snap b/tests/object_colon_bug/__snapshots__/jsfmt.spec.js.snap
index 06ab37f72..4f491cd53 100644
--- a/tests/object_colon_bug/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/object_colon_bug/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`bug.js 1`] = `
+exports[`bug.js-flow 1`] = `
 "const foo = {
   bar: props.bar ? props.bar : noop,
   baz: props.baz
@@ -15,7 +15,7 @@ const foo = {
 "
 `;
 
-exports[`bug.js 2`] = `
+exports[`bug.js-typescript 1`] = `
 "const foo = {
   bar: props.bar ? props.bar : noop,
   baz: props.baz
diff --git a/tests/object_property_comment/__snapshots__/jsfmt.spec.js.snap b/tests/object_property_comment/__snapshots__/jsfmt.spec.js.snap
index 85e493ef5..c5cf2adc6 100644
--- a/tests/object_property_comment/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/object_property_comment/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`comment.js 1`] = `
+exports[`comment.js-flow 1`] = `
 "o = {
   name:
     // Comment A
diff --git a/tests/objects/__snapshots__/jsfmt.spec.js.snap b/tests/objects/__snapshots__/jsfmt.spec.js.snap
index e96e512a7..5d8f3a6db 100644
--- a/tests/objects/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/objects/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`expand.js 1`] = `
+exports[`expand.js-babylon 1`] = `
 "const Component1 = ({ props }) => (
   <Text>Test</Text>
 );
@@ -17,7 +17,7 @@ const Component2 = ({ props }) => <Text>Test</Text>;
 "
 `;
 
-exports[`expression.js 1`] = `
+exports[`expression.js-babylon 1`] = `
 "() => ({}\`\`);
 ({})\`\`;
 a = () => ({}).x;
@@ -40,14 +40,14 @@ a = () => ({}.x);
 "
 `;
 
-exports[`method.js 1`] = `
+exports[`method.js-babylon 1`] = `
 "a = { f() {} }
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 a = { f() {} };
 "
 `;
 
-exports[`range.js 1`] = `
+exports[`range.js-babylon 1`] = `
 "group(
   concat([
     \\"(\\",
diff --git a/tests/optional-type-name/__snapshots__/jsfmt.spec.js.snap b/tests/optional-type-name/__snapshots__/jsfmt.spec.js.snap
index e06a66ec8..60fc8078a 100644
--- a/tests/optional-type-name/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/optional-type-name/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "type Foo = (any) => string
 
 type Bar = { [string]: number }
diff --git a/tests/preserve_line/__snapshots__/jsfmt.spec.js.snap b/tests/preserve_line/__snapshots__/jsfmt.spec.js.snap
index 68aa4eb2a..fc023eb7e 100644
--- a/tests/preserve_line/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/preserve_line/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`comments.js 1`] = `
+exports[`comments.js-flow 1`] = `
 "function a() {
   const a = 5; // comment
 
@@ -61,7 +61,7 @@ function a() {
 "
 `;
 
-exports[`comments.js 2`] = `
+exports[`comments.js-typescript 1`] = `
 "function a() {
   const a = 5; // comment
 
diff --git a/tests/quotes/__snapshots__/jsfmt.spec.js.snap b/tests/quotes/__snapshots__/jsfmt.spec.js.snap
index e055dd5ee..268b06e2b 100644
--- a/tests/quotes/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/quotes/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`functions.js 1`] = `
+exports[`functions.js-flow 1`] = `
 "const a = () => \\"Foo bar\\";
 
 function b(object, key) {
@@ -15,7 +15,7 @@ function b(object, key) {
 "
 `;
 
-exports[`functions.js 2`] = `
+exports[`functions.js-flow 2`] = `
 "const a = () => \\"Foo bar\\";
 
 function b(object, key) {
@@ -30,7 +30,7 @@ function b(object, key) {
 "
 `;
 
-exports[`strings.js 1`] = `
+exports[`strings.js-flow 1`] = `
 "// Every string will be changed to double quotes, unless we end up with fewer
 // escaped quotes by using single quotes. (Vice versa if the \\"singleQuote\\"
 // option is true).
@@ -147,7 +147,7 @@ exports[`strings.js 1`] = `
 "
 `;
 
-exports[`strings.js 2`] = `
+exports[`strings.js-flow 2`] = `
 "// Every string will be changed to double quotes, unless we end up with fewer
 // escaped quotes by using single quotes. (Vice versa if the \\"singleQuote\\"
 // option is true).
diff --git a/tests/require/__snapshots__/jsfmt.spec.js.snap b/tests/require/__snapshots__/jsfmt.spec.js.snap
index 2cc0c6b02..89d586c55 100644
--- a/tests/require/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/require/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`require.js 1`] = `
+exports[`require.js-flow 1`] = `
 "const { one, two, thee, four, five, six, seven, eight, nine, ten } = require('./my-utils');
 const { one, two, thee, four, five, six, seven, eight, nine, ten, eleven } = require('./my-utils');
 
@@ -36,7 +36,7 @@ const MyReallyExtrememlyLongModuleName = require(\\"MyReallyExtrememlyLongModule
 "
 `;
 
-exports[`require.js 2`] = `
+exports[`require.js-typescript 1`] = `
 "const { one, two, thee, four, five, six, seven, eight, nine, ten } = require('./my-utils');
 const { one, two, thee, four, five, six, seven, eight, nine, ten, eleven } = require('./my-utils');
 
diff --git a/tests/rest/__snapshots__/jsfmt.spec.js.snap b/tests/rest/__snapshots__/jsfmt.spec.js.snap
index d723daef3..a8dbb1ed7 100644
--- a/tests/rest/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/rest/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`trailing-commas.js 1`] = `
+exports[`trailing-commas.js-flow 1`] = `
 "declare class C {
   f(
     superSuperSuperSuperSuperSuperSuperSuperSuperSuperSuperSuperSuperSuperLong,
diff --git a/tests/return/__snapshots__/jsfmt.spec.js.snap b/tests/return/__snapshots__/jsfmt.spec.js.snap
index c9fac0ee1..3ee0b6cd5 100644
--- a/tests/return/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/return/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`binaryish.js 1`] = `
+exports[`binaryish.js-flow 1`] = `
 "function f() {
   return (
     property.isIdentifier() &&
diff --git a/tests/shebang/__snapshots__/jsfmt.spec.js.snap b/tests/shebang/__snapshots__/jsfmt.spec.js.snap
index ee799cb7e..4b9e87c10 100644
--- a/tests/shebang/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/shebang/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`shebang.js 1`] = `
+exports[`shebang.js-flow 1`] = `
 "#!/usr/bin/env node
 function a() {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -9,7 +9,7 @@ function a() {}
 "
 `;
 
-exports[`shebang.js 2`] = `
+exports[`shebang.js-typescript 1`] = `
 "#!/usr/bin/env node
 function a() {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -18,7 +18,7 @@ function a() {}
 "
 `;
 
-exports[`shebang-newline.js 1`] = `
+exports[`shebang-newline.js-flow 1`] = `
 "#!/usr/bin/env node
 
 function a() {}
@@ -29,7 +29,7 @@ function a() {}
 "
 `;
 
-exports[`shebang-newline.js 2`] = `
+exports[`shebang-newline.js-typescript 1`] = `
 "#!/usr/bin/env node
 
 function a() {}
diff --git a/tests/strings/__snapshots__/jsfmt.spec.js.snap b/tests/strings/__snapshots__/jsfmt.spec.js.snap
index 44d7a05d8..35610770c 100644
--- a/tests/strings/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/strings/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`strings.js 1`] = `
+exports[`strings.js-flow 1`] = `
 "[
   \\"abc\\",
   'abc',
@@ -54,7 +54,7 @@ exports[`strings.js 1`] = `
 "
 `;
 
-exports[`strings.js 2`] = `
+exports[`strings.js-flow 2`] = `
 "[
   \\"abc\\",
   'abc',
@@ -108,7 +108,7 @@ exports[`strings.js 2`] = `
 "
 `;
 
-exports[`template-literals.js 1`] = `
+exports[`template-literals.js-flow 1`] = `
 "foo(\`a long string \${ 1 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + 3 } with expr\`);
 
 const x = \`a long string \${ 1 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + ( function() {return 3 })() + 3 + 2 + 3 + 2 + 3 } with expr\`;
@@ -145,7 +145,7 @@ pipe.write(
 "
 `;
 
-exports[`template-literals.js 2`] = `
+exports[`template-literals.js-flow 2`] = `
 "foo(\`a long string \${ 1 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + 3 } with expr\`);
 
 const x = \`a long string \${ 1 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + 3 + 2 + ( function() {return 3 })() + 3 + 2 + 3 + 2 + 3 } with expr\`;
diff --git a/tests/switch/__snapshots__/jsfmt.spec.js.snap b/tests/switch/__snapshots__/jsfmt.spec.js.snap
index 57d35be47..338a0e0ee 100644
--- a/tests/switch/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/switch/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`empty_switch.js 1`] = `
+exports[`empty_switch.js-flow 1`] = `
 "switch (1) { default:; }
 switch (1) {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -12,7 +12,7 @@ switch (1) {
 "
 `;
 
-exports[`empty_switch.js 2`] = `
+exports[`empty_switch.js-typescript 1`] = `
 "switch (1) { default:; }
 switch (1) {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/tabWith/__snapshots__/jsfmt.spec.js.snap b/tests/tabWith/__snapshots__/jsfmt.spec.js.snap
index 2270b72f2..c62d6dc36 100644
--- a/tests/tabWith/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/tabWith/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`class.js 1`] = `
+exports[`class.js-flow 1`] = `
 "class A {
   method() {
     var x = 1;
@@ -25,7 +25,7 @@ class A {
 "
 `;
 
-exports[`class.js 2`] = `
+exports[`class.js-flow 2`] = `
 "class A {
   method() {
     var x = 1;
@@ -50,7 +50,7 @@ class A {
 "
 `;
 
-exports[`nested-functions.spec.js 1`] = `
+exports[`nested-functions.spec.js-flow 1`] = `
 "const c = () => {};
 
 function a() {
@@ -77,7 +77,7 @@ function a() {
 "
 `;
 
-exports[`nested-functions.spec.js 2`] = `
+exports[`nested-functions.spec.js-flow 2`] = `
 "const c = () => {};
 
 function a() {
diff --git a/tests/template/__snapshots__/jsfmt.spec.js.snap b/tests/template/__snapshots__/jsfmt.spec.js.snap
index 39ac372fb..cacbbfb6e 100644
--- a/tests/template/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/template/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`faulty-locations.js 1`] = `
+exports[`faulty-locations.js-flow 1`] = `
 "var o = {
   [\`key\`]: () => {
     // Comment
@@ -33,7 +33,7 @@ var x = {
 "
 `;
 
-exports[`faulty-locations.js 2`] = `
+exports[`faulty-locations.js-typescript 1`] = `
 "var o = {
   [\`key\`]: () => {
     // Comment
@@ -66,7 +66,7 @@ var x = {
 "
 `;
 
-exports[`parenthesis.js 1`] = `
+exports[`parenthesis.js-flow 1`] = `
 "// \\"ArrowFunctionExpression\\"
 (() => {})\`\`;
 
@@ -179,7 +179,7 @@ function* f() {
 "
 `;
 
-exports[`parenthesis.js 2`] = `
+exports[`parenthesis.js-typescript 1`] = `
 "// \\"ArrowFunctionExpression\\"
 (() => {})\`\`;
 
diff --git a/tests/ternaries/__snapshots__/jsfmt.spec.js.snap b/tests/ternaries/__snapshots__/jsfmt.spec.js.snap
index d4cdad92b..12c847462 100644
--- a/tests/ternaries/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/ternaries/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "const obj0 = conditionIsTruthy ? shortThing : otherShortThing
 
 const obj1 = conditionIsTruthy ? { some: 'long', object: 'with', lots: 'of', stuff } : shortThing
@@ -52,7 +52,7 @@ const obj5 = conditionIsTruthy
 "
 `;
 
-exports[`test.js 2`] = `
+exports[`test.js-flow 2`] = `
 "const obj0 = conditionIsTruthy ? shortThing : otherShortThing
 
 const obj1 = conditionIsTruthy ? { some: 'long', object: 'with', lots: 'of', stuff } : shortThing
@@ -104,7 +104,7 @@ const obj5 = conditionIsTruthy
 "
 `;
 
-exports[`test.js 3`] = `
+exports[`test.js-typescript 1`] = `
 "const obj0 = conditionIsTruthy ? shortThing : otherShortThing
 
 const obj1 = conditionIsTruthy ? { some: 'long', object: 'with', lots: 'of', stuff } : shortThing
@@ -156,7 +156,7 @@ const obj5 = conditionIsTruthy
 "
 `;
 
-exports[`test.js 4`] = `
+exports[`test.js-typescript 2`] = `
 "const obj0 = conditionIsTruthy ? shortThing : otherShortThing
 
 const obj1 = conditionIsTruthy ? { some: 'long', object: 'with', lots: 'of', stuff } : shortThing
diff --git a/tests/test_declarations/__snapshots__/jsfmt.spec.js.snap b/tests/test_declarations/__snapshots__/jsfmt.spec.js.snap
index e52cda389..37c88af2c 100644
--- a/tests/test_declarations/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/test_declarations/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test_declarations.js 1`] = `
+exports[`test_declarations.js-flow 1`] = `
 "// Shouldn't break
 
 it(\\"does something really long and complicated so I have to write a very long name for the test\\", () => {
@@ -153,7 +153,7 @@ it.only.only(
 "
 `;
 
-exports[`test_declarations.js 2`] = `
+exports[`test_declarations.js-typescript 1`] = `
 "// Shouldn't break
 
 it(\\"does something really long and complicated so I have to write a very long name for the test\\", () => {
diff --git a/tests/trailing_comma/__snapshots__/jsfmt.spec.js.snap b/tests/trailing_comma/__snapshots__/jsfmt.spec.js.snap
index dc2d9623a..8c7bff75d 100644
--- a/tests/trailing_comma/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/trailing_comma/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`es5.js 1`] = `
+exports[`es5.js-flow 1`] = `
 "function send_single_email(
   app,
   email_id,
@@ -39,7 +39,7 @@ function send_single_email(
 "
 `;
 
-exports[`es5.js 2`] = `
+exports[`es5.js-flow 2`] = `
 "function send_single_email(
   app,
   email_id,
@@ -78,7 +78,7 @@ function send_single_email(
 "
 `;
 
-exports[`es5.js 3`] = `
+exports[`es5.js-flow 3`] = `
 "function send_single_email(
   app,
   email_id,
@@ -117,7 +117,7 @@ function send_single_email(
 "
 `;
 
-exports[`es5.js 4`] = `
+exports[`es5.js-typescript 1`] = `
 "function send_single_email(
   app,
   email_id,
@@ -156,7 +156,7 @@ function send_single_email(
 "
 `;
 
-exports[`es5.js 5`] = `
+exports[`es5.js-typescript 2`] = `
 "function send_single_email(
   app,
   email_id,
@@ -195,7 +195,7 @@ function send_single_email(
 "
 `;
 
-exports[`es5.js 6`] = `
+exports[`es5.js-typescript 3`] = `
 "function send_single_email(
   app,
   email_id,
@@ -234,7 +234,7 @@ function send_single_email(
 "
 `;
 
-exports[`function-calls.js 1`] = `
+exports[`function-calls.js-flow 1`] = `
 "const a = (param1, param2, param3) => {}
 
 a('value', 'value2', 'value3');
@@ -265,7 +265,7 @@ a(
 "
 `;
 
-exports[`function-calls.js 2`] = `
+exports[`function-calls.js-flow 2`] = `
 "const a = (param1, param2, param3) => {}
 
 a('value', 'value2', 'value3');
@@ -296,7 +296,7 @@ a(
 "
 `;
 
-exports[`function-calls.js 3`] = `
+exports[`function-calls.js-flow 3`] = `
 "const a = (param1, param2, param3) => {}
 
 a('value', 'value2', 'value3');
@@ -327,7 +327,7 @@ a(
 "
 `;
 
-exports[`function-calls.js 4`] = `
+exports[`function-calls.js-typescript 1`] = `
 "const a = (param1, param2, param3) => {}
 
 a('value', 'value2', 'value3');
@@ -358,7 +358,7 @@ a(
 "
 `;
 
-exports[`function-calls.js 5`] = `
+exports[`function-calls.js-typescript 2`] = `
 "const a = (param1, param2, param3) => {}
 
 a('value', 'value2', 'value3');
@@ -389,7 +389,7 @@ a(
 "
 `;
 
-exports[`function-calls.js 6`] = `
+exports[`function-calls.js-typescript 3`] = `
 "const a = (param1, param2, param3) => {}
 
 a('value', 'value2', 'value3');
@@ -420,7 +420,7 @@ a(
 "
 `;
 
-exports[`object.js 1`] = `
+exports[`object.js-flow 1`] = `
 "const a = {
   b: true,
   c: {
@@ -467,7 +467,7 @@ const aLong = {
 "
 `;
 
-exports[`object.js 2`] = `
+exports[`object.js-flow 2`] = `
 "const a = {
   b: true,
   c: {
@@ -514,7 +514,7 @@ const aLong = {
 "
 `;
 
-exports[`object.js 3`] = `
+exports[`object.js-flow 3`] = `
 "const a = {
   b: true,
   c: {
@@ -561,7 +561,7 @@ const aLong = {
 "
 `;
 
-exports[`object.js 4`] = `
+exports[`object.js-typescript 1`] = `
 "const a = {
   b: true,
   c: {
@@ -608,7 +608,7 @@ const aLong = {
 "
 `;
 
-exports[`object.js 5`] = `
+exports[`object.js-typescript 2`] = `
 "const a = {
   b: true,
   c: {
@@ -655,7 +655,7 @@ const aLong = {
 "
 `;
 
-exports[`object.js 6`] = `
+exports[`object.js-typescript 3`] = `
 "const a = {
   b: true,
   c: {
@@ -702,7 +702,7 @@ const aLong = {
 "
 `;
 
-exports[`trailing_whitespace.js 1`] = `
+exports[`trailing_whitespace.js-flow 1`] = `
 "let example = [
   'FOO',
   'BAR',
@@ -778,7 +778,7 @@ function supersupersupersuperLongF(
 "
 `;
 
-exports[`trailing_whitespace.js 2`] = `
+exports[`trailing_whitespace.js-flow 2`] = `
 "let example = [
   'FOO',
   'BAR',
@@ -854,7 +854,7 @@ function supersupersupersuperLongF(
 "
 `;
 
-exports[`trailing_whitespace.js 3`] = `
+exports[`trailing_whitespace.js-flow 3`] = `
 "let example = [
   'FOO',
   'BAR',
@@ -930,7 +930,7 @@ function supersupersupersuperLongF(
 "
 `;
 
-exports[`trailing_whitespace.js 4`] = `
+exports[`trailing_whitespace.js-typescript 1`] = `
 "let example = [
   'FOO',
   'BAR',
@@ -1006,7 +1006,7 @@ function supersupersupersuperLongF(
 "
 `;
 
-exports[`trailing_whitespace.js 5`] = `
+exports[`trailing_whitespace.js-typescript 2`] = `
 "let example = [
   'FOO',
   'BAR',
@@ -1082,7 +1082,7 @@ function supersupersupersuperLongF(
 "
 `;
 
-exports[`trailing_whitespace.js 6`] = `
+exports[`trailing_whitespace.js-typescript 3`] = `
 "let example = [
   'FOO',
   'BAR',
diff --git a/tests/trailing_whitespace/__snapshots__/jsfmt.spec.js.snap b/tests/trailing_whitespace/__snapshots__/jsfmt.spec.js.snap
index fdbdef959..e5850805f 100644
--- a/tests/trailing_whitespace/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/trailing_whitespace/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`trailing.js 1`] = `
+exports[`trailing.js-flow 1`] = `
 "export type Result<T, V> = | { kind: \\"not-test-editor1\\" } | { kind: \\"not-test-editor2\\" };
 
 // Note: there are trailing whitespace in this file
diff --git a/tests/try/__snapshots__/jsfmt.spec.js.snap b/tests/try/__snapshots__/jsfmt.spec.js.snap
index 77187de16..3d613725a 100644
--- a/tests/try/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/try/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`empty.js 1`] = `
+exports[`empty.js-flow 1`] = `
 "try {
 } catch (e) {
 }
@@ -21,7 +21,7 @@ try {
 "
 `;
 
-exports[`empty.js 2`] = `
+exports[`empty.js-typescript 1`] = `
 "try {
 } catch (e) {
 }
@@ -42,7 +42,7 @@ try {
 "
 `;
 
-exports[`try.js 1`] = `
+exports[`try.js-flow 1`] = `
 "try
 /* missing comment */
 {;}
@@ -55,7 +55,7 @@ try {
 "
 `;
 
-exports[`try.js 2`] = `
+exports[`try.js-typescript 1`] = `
 "try
 /* missing comment */
 {;}
diff --git a/tests/typescript/conformance/types/any/__snapshots__/jsfmt.spec.js.snap b/tests/typescript/conformance/types/any/__snapshots__/jsfmt.spec.js.snap
index 962556c33..0597805a9 100644
--- a/tests/typescript/conformance/types/any/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/typescript/conformance/types/any/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`anyAsConstructor.ts 1`] = `
+exports[`anyAsConstructor.ts-typescript 1`] = `
 "// any is considered an untyped function call
 // can be called except with type arguments which is an error
 
@@ -25,7 +25,7 @@ var d = new x<any>(x); // no error
 "
 `;
 
-exports[`anyAsFunctionCall.ts 1`] = `
+exports[`anyAsFunctionCall.ts-typescript 1`] = `
 "// any is considered an untyped function call
 // can be called except with type arguments which is an error
 
@@ -44,7 +44,7 @@ var c = x(x);
 "
 `;
 
-exports[`anyAsGenericFunctionCall.ts 1`] = `
+exports[`anyAsGenericFunctionCall.ts-typescript 1`] = `
 "// any is considered an untyped function call
 // can be called except with type arguments which is an error
 
@@ -73,7 +73,7 @@ var d = x<any>(x);
 "
 `;
 
-exports[`anyPropertyAccess.ts 1`] = `
+exports[`anyPropertyAccess.ts-typescript 1`] = `
 "var x: any;
 var a = x.foo;
 var b = x['foo'];
diff --git a/tests/typescript/conformance/types/functions/__snapshots__/jsfmt.spec.js.snap b/tests/typescript/conformance/types/functions/__snapshots__/jsfmt.spec.js.snap
index 3285f3a24..a5b4b3e72 100644
--- a/tests/typescript/conformance/types/functions/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/typescript/conformance/types/functions/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`functionImplementationErrors.ts 1`] = `
+exports[`functionImplementationErrors.ts-typescript 1`] = `
 "// @allowUnreachableCode: true
 
 // FunctionExpression with no return type annotation with multiple return statements with unrelated types
@@ -160,7 +160,7 @@ var f13 = () => {
 "
 `;
 
-exports[`functionImplementations.ts 1`] = `
+exports[`functionImplementations.ts-typescript 1`] = `
 "// @allowUnreachableCode: true
 
 // FunctionExpression with no return type annotation and no return statement returns void
@@ -501,7 +501,7 @@ var f12: (x: number) => any = x => {
 "
 `;
 
-exports[`functionOverloadCompatibilityWithVoid01.ts 1`] = `
+exports[`functionOverloadCompatibilityWithVoid01.ts-typescript 1`] = `
 "function f(x: string): number;
 function f(x: string): void {
     return;
@@ -514,7 +514,7 @@ function f(x: string): void {
 "
 `;
 
-exports[`functionOverloadCompatibilityWithVoid02.ts 1`] = `
+exports[`functionOverloadCompatibilityWithVoid02.ts-typescript 1`] = `
 "function f(x: string): void;
 function f(x: string): number {
     return 0;
@@ -527,7 +527,7 @@ function f(x: string): number {
 "
 `;
 
-exports[`functionOverloadCompatibilityWithVoid03.ts 1`] = `
+exports[`functionOverloadCompatibilityWithVoid03.ts-typescript 1`] = `
 "function f(x: string): void;
 function f(x: string): void {
     return;
@@ -540,7 +540,7 @@ function f(x: string): void {
 "
 `;
 
-exports[`functionOverloadErrorsSyntax.ts 1`] = `
+exports[`functionOverloadErrorsSyntax.ts-typescript 1`] = `
 "//Function overload signature with optional parameter followed by non-optional parameter
 function fn4a(x?: number, y: string);
 function fn4a() { }
@@ -565,7 +565,7 @@ function fn5() {}
 "
 `;
 
-exports[`parameterInitializersForwardReferencing.ts 1`] = `
+exports[`parameterInitializersForwardReferencing.ts-typescript 1`] = `
 "function left(a, b = a, c = b) {
     a;
     b;
diff --git a/tests/typescript/conformance/types/tuple/__snapshots__/jsfmt.spec.js.snap b/tests/typescript/conformance/types/tuple/__snapshots__/jsfmt.spec.js.snap
index 2ce504a67..9df09f27e 100644
--- a/tests/typescript/conformance/types/tuple/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/typescript/conformance/types/tuple/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`contextualTypeWithTuple.ts 1`] = `
+exports[`contextualTypeWithTuple.ts-typescript 1`] = `
 "// no error
 var numStrTuple: [number, string] = [5, \\"hello\\"];
 var numStrTuple2: [number, string] = [5, \\"foo\\", true];
@@ -55,7 +55,7 @@ numStrTuple = unionTuple3;
 "
 `;
 
-exports[`indexerWithTuple.ts 1`] = `
+exports[`indexerWithTuple.ts-typescript 1`] = `
 "var strNumTuple: [string, number] = [\\"foo\\", 10]; 
 var numTupleTuple: [number, [string, number]] = [10, [\\"bar\\", 20]];
 var unionTuple1: [number, string| number] = [10, \\"foo\\"]; 
@@ -124,35 +124,35 @@ var eleUnion26 = unionTuple2[\\"1\\"]; // string | number
 "
 `;
 
-exports[`tupleElementTypes1.ts 1`] = `
+exports[`tupleElementTypes1.ts-typescript 1`] = `
 "var [a, b]: [number, any] = [undefined, undefined];
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 var [a, b]: [number, any] = [undefined, undefined];
 "
 `;
 
-exports[`tupleElementTypes2.ts 1`] = `
+exports[`tupleElementTypes2.ts-typescript 1`] = `
 "function f([a, b]: [number, any]) { }
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 function f([a, b]: [number, any]) {}
 "
 `;
 
-exports[`tupleElementTypes3.ts 1`] = `
+exports[`tupleElementTypes3.ts-typescript 1`] = `
 "var [a, b] = [0, undefined];
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 var [a, b] = [0, undefined];
 "
 `;
 
-exports[`tupleElementTypes4.ts 1`] = `
+exports[`tupleElementTypes4.ts-typescript 1`] = `
 "function f([a, b] = [0, undefined]) { }
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 function f([a, b] = [0, undefined]) {}
 "
 `;
 
-exports[`typeInferenceWithTupleType.ts 1`] = `
+exports[`typeInferenceWithTupleType.ts-typescript 1`] = `
 "function combine<T, U>(x: T, y: U): [T, U] {
     return [x, y];
 }
@@ -204,7 +204,7 @@ var zipResultEleEle = zipResult[0][0]; // string
 "
 `;
 
-exports[`wideningTuples1.ts 1`] = `
+exports[`wideningTuples1.ts-typescript 1`] = `
 "//@noImplicitAny: true
 declare function foo<T extends [any]>(x: T): T;
 
@@ -219,7 +219,7 @@ y = [\\"\\"];
 "
 `;
 
-exports[`wideningTuples2.ts 1`] = `
+exports[`wideningTuples2.ts-typescript 1`] = `
 "//@noImplicitAny: true
 var foo: () => [any] = function bar() {
     let intermediate = bar();
@@ -236,7 +236,7 @@ var foo: () => [any] = function bar() {
 "
 `;
 
-exports[`wideningTuples3.ts 1`] = `
+exports[`wideningTuples3.ts-typescript 1`] = `
 "//@noImplicitAny: true
 var a: [any];
 
@@ -249,7 +249,7 @@ var b = (a = [undefined, null]);
 "
 `;
 
-exports[`wideningTuples4.ts 1`] = `
+exports[`wideningTuples4.ts-typescript 1`] = `
 "var a: [any];
 
 var b = a = [undefined, null];
@@ -262,7 +262,7 @@ b = [\\"\\", \\"\\"];
 "
 `;
 
-exports[`wideningTuples5.ts 1`] = `
+exports[`wideningTuples5.ts-typescript 1`] = `
 "//@noImplicitAny: true
 var [a, b] = [undefined, null];
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -271,7 +271,7 @@ var [a, b] = [undefined, null];
 "
 `;
 
-exports[`wideningTuples6.ts 1`] = `
+exports[`wideningTuples6.ts-typescript 1`] = `
 "var [a, b] = [undefined, null];
 a = \\"\\";
 b = \\"\\";
@@ -282,7 +282,7 @@ b = \\"\\";
 "
 `;
 
-exports[`wideningTuples7.ts 1`] = `
+exports[`wideningTuples7.ts-typescript 1`] = `
 "//@noImplicitAny: true
 var foo = function bar() {
     let intermediate: [string];
diff --git a/tests/typescript/conformance/types/tuple/emptyTuples/__snapshots__/jsfmt.spec.js.snap b/tests/typescript/conformance/types/tuple/emptyTuples/__snapshots__/jsfmt.spec.js.snap
index 983dc8193..27cc6e515 100644
--- a/tests/typescript/conformance/types/tuple/emptyTuples/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/typescript/conformance/types/tuple/emptyTuples/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`emptyTuplesTypeAssertion02.ts 1`] = `
+exports[`emptyTuplesTypeAssertion02.ts-typescript 1`] = `
 "// @declaration: true
 
 let x = [] as [];
diff --git a/tests/typescript/conformance/types/typeParameters/typeParameterLists/__snapshots__/jsfmt.spec.js.snap b/tests/typescript/conformance/types/typeParameters/typeParameterLists/__snapshots__/jsfmt.spec.js.snap
index 424061b96..f55af91a9 100644
--- a/tests/typescript/conformance/types/typeParameters/typeParameterLists/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/typescript/conformance/types/typeParameters/typeParameterLists/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`innerTypeParameterShadowingOuterOne.ts 1`] = `
+exports[`innerTypeParameterShadowingOuterOne.ts-typescript 1`] = `
 "// inner type parameters shadow outer ones of the same name
 // no errors expected
 
@@ -61,7 +61,7 @@ function f2<T extends Date, U extends Date>() {
 "
 `;
 
-exports[`innerTypeParameterShadowingOuterOne2.ts 1`] = `
+exports[`innerTypeParameterShadowingOuterOne2.ts-typescript 1`] = `
 "// inner type parameters shadow outer ones of the same name
 // no errors expected
 
@@ -140,7 +140,7 @@ class C2<T extends Date, U extends Date> {
 "
 `;
 
-exports[`staticMembersUsingClassTypeParameter.ts 1`] = `
+exports[`staticMembersUsingClassTypeParameter.ts-typescript 1`] = `
 "// BUG 745747
 class C<T> {
     static x: T;
@@ -175,7 +175,7 @@ class C3<T extends Date> {
 "
 `;
 
-exports[`typeParametersAvailableInNestedScope2.ts 1`] = `
+exports[`typeParametersAvailableInNestedScope2.ts-typescript 1`] = `
 "function foo<T, U>(x: T, y: U) {
     function bar<V>(z: V) {
         function baz<W>(a: W) {
diff --git a/tests/typescript/conformance/types/union/__snapshots__/jsfmt.spec.js.snap b/tests/typescript/conformance/types/union/__snapshots__/jsfmt.spec.js.snap
index 1c81c780d..1ae84c428 100644
--- a/tests/typescript/conformance/types/union/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/typescript/conformance/types/union/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`unionTypeCallSignatures.ts 1`] = `
+exports[`unionTypeCallSignatures.ts-typescript 1`] = `
 "var numOrDate: number | Date;
 var strOrBoolean: string | boolean;
 var strOrNum: string | number;
@@ -175,7 +175,7 @@ strOrNum = unionWithRestParameter4(\\"hello\\", \\"world\\");
 "
 `;
 
-exports[`unionTypeCallSignatures3.ts 1`] = `
+exports[`unionTypeCallSignatures3.ts-typescript 1`] = `
 "function f1(s: string) { }
 function f2(s?: string) { }
 function f3(...s: string[]) { }
@@ -209,7 +209,7 @@ fUnion(\\"\\"); // All constituents can be called by passing a single string.
 "
 `;
 
-exports[`unionTypeCallSignatures4.ts 1`] = `
+exports[`unionTypeCallSignatures4.ts-typescript 1`] = `
 "type F1 = (a: string, b?: string) => void;
 type F2 = (a: string, b?: string, c?: string) => void;
 type F3 = (a: string, ...rest: string[]) => void;
@@ -264,7 +264,7 @@ f12345(\\"a\\", \\"b\\", \\"c\\"); // error
 "
 `;
 
-exports[`unionTypeConstructSignatures.ts 1`] = `
+exports[`unionTypeConstructSignatures.ts-typescript 1`] = `
 "var numOrDate: number | Date;
 var strOrBoolean: string | boolean;
 var strOrNum: string | number;
@@ -431,7 +431,7 @@ strOrNum = new unionWithRestParameter3(); // error no call signature
 "
 `;
 
-exports[`unionTypeEquivalence.ts 1`] = `
+exports[`unionTypeEquivalence.ts-typescript 1`] = `
 "// A | B is equivalent to A if B is a subtype of A
 class C { }
 class D extends C { foo() { } }
@@ -474,7 +474,7 @@ var z1: string | typeof BC;
 "
 `;
 
-exports[`unionTypeFromArrayLiteral.ts 1`] = `
+exports[`unionTypeFromArrayLiteral.ts-typescript 1`] = `
 "// The resulting type an array literal expression is determined as follows:
 // If the array literal is empty, the resulting type is an array type with the element type Undefined.
 // Otherwise, if the array literal is contextually typed by a type that has a property with the numeric name ‘0’, the resulting type is a tuple type constructed from the types of the element expressions.
@@ -533,7 +533,7 @@ var arr9 = [e, f]; // (E|F)[]
 "
 `;
 
-exports[`unionTypeIndexSignature.ts 1`] = `
+exports[`unionTypeIndexSignature.ts-typescript 1`] = `
 "var numOrDate: number | Date;
 var anyVar: number;
 
@@ -590,7 +590,7 @@ anyVar = unionOfTypesWithAndWithoutStringSignature1[10]; // any
 "
 `;
 
-exports[`unionTypePropertyAccessibility.ts 1`] = `
+exports[`unionTypePropertyAccessibility.ts-typescript 1`] = `
 "class Default {
     member: string;
 }
diff --git a/tests/unary/__snapshots__/jsfmt.spec.js.snap b/tests/unary/__snapshots__/jsfmt.spec.js.snap
index 1868258ab..6ce696f0f 100644
--- a/tests/unary/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/unary/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`object.js 1`] = `
+exports[`object.js-flow 1`] = `
 "state = {
   // students
   hoverColumn: -1
@@ -13,7 +13,7 @@ state = {
 "
 `;
 
-exports[`object.js 2`] = `
+exports[`object.js-typescript 1`] = `
 "state = {
   // students
   hoverColumn: -1
@@ -26,7 +26,7 @@ state = {
 "
 `;
 
-exports[`series.js 1`] = `
+exports[`series.js-flow 1`] = `
 "1 + ++x;
 1 + x++;
 
@@ -65,7 +65,7 @@ x-- - 1;
 "
 `;
 
-exports[`series.js 2`] = `
+exports[`series.js-typescript 1`] = `
 "1 + ++x;
 1 + x++;
 
diff --git a/tests/unary_expression/__snapshots__/jsfmt.spec.js.snap b/tests/unary_expression/__snapshots__/jsfmt.spec.js.snap
index d23cc4c30..807d65849 100644
--- a/tests/unary_expression/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/unary_expression/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`urnary_expression.js 1`] = `
+exports[`urnary_expression.js-flow 1`] = `
 "!!x
 x++
 x--;
@@ -21,7 +21,7 @@ x * +y;
 "
 `;
 
-exports[`urnary_expression.js 2`] = `
+exports[`urnary_expression.js-typescript 1`] = `
 "!!x
 x++
 x--;
diff --git a/tests/unicode/__snapshots__/jsfmt.spec.js.snap b/tests/unicode/__snapshots__/jsfmt.spec.js.snap
index 69006e423..de7feded0 100644
--- a/tests/unicode/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/unicode/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`keys.js 1`] = `
+exports[`keys.js-flow 1`] = `
 "({'この事はつもり素晴らしいことさ': '35jL9V'})
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 ({ \\"この事はつもり素晴らしいことさ\\": \\"35jL9V\\" });
diff --git a/tests/union_intersection/__snapshots__/jsfmt.spec.js.snap b/tests/union_intersection/__snapshots__/jsfmt.spec.js.snap
index 520c0c149..263682578 100644
--- a/tests/union_intersection/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/union_intersection/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test.js 1`] = `
+exports[`test.js-flow 1`] = `
 "type T5 = \\"1\\" | \\"2\\" | \\"3\\" | \\"4\\" | \\"5\\" | \\"6\\" | \\"7\\" | \\"8\\" | \\"9\\" | \\"10\\" | \\"11\\" | \\"12\\" | \\"13\\";
 
 type T6 = \\"a-long-string\\" | \\"another-long-string\\" | \\"yet-another-long-string\\" | \\"one-more-for-good-measure\\";
diff --git a/tests/update_expression/__snapshots__/jsfmt.spec.js.snap b/tests/update_expression/__snapshots__/jsfmt.spec.js.snap
index 1d0217054..30af9f402 100644
--- a/tests/update_expression/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/update_expression/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`update_expression.js 1`] = `
+exports[`update_expression.js-flow 1`] = `
 "(this.x++).toString()
 new (r++);
 (x++)();
@@ -13,7 +13,7 @@ const uuid = String(this._uuidCounter++);
 "
 `;
 
-exports[`update_expression.js 2`] = `
+exports[`update_expression.js-typescript 1`] = `
 "(this.x++).toString()
 new (r++);
 (x++)();
diff --git a/tests/while/__snapshots__/jsfmt.spec.js.snap b/tests/while/__snapshots__/jsfmt.spec.js.snap
index 11d7214bb..03192ac79 100644
--- a/tests/while/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/while/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`indent.js 1`] = `
+exports[`indent.js-flow 1`] = `
 "if (someVeryLongStringA && someVeryLongStringB && someVeryLongStringC && someVeryLongStringD) {}
 while (someVeryLongStringA && someVeryLongStringB && someVeryLongStringC && someVeryLongStringD) {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -21,7 +21,7 @@ while (
 "
 `;
 
-exports[`indent.js 2`] = `
+exports[`indent.js-typescript 1`] = `
 "if (someVeryLongStringA && someVeryLongStringB && someVeryLongStringC && someVeryLongStringD) {}
 while (someVeryLongStringA && someVeryLongStringB && someVeryLongStringC && someVeryLongStringD) {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/tests/windows/__snapshots__/jsfmt.spec.js.snap b/tests/windows/__snapshots__/jsfmt.spec.js.snap
index 6b0016a15..9f1607450 100644
--- a/tests/windows/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/windows/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`line-ending.js 1`] = `
+exports[`line-ending.js-flow 1`] = `
 "this;
 has;
 windows;
@@ -15,7 +15,7 @@ endings;
 "
 `;
 
-exports[`line-ending.js 2`] = `
+exports[`line-ending.js-typescript 1`] = `
 "this;
 has;
 windows;
diff --git a/tests/yield/__snapshots__/jsfmt.spec.js.snap b/tests/yield/__snapshots__/jsfmt.spec.js.snap
index f2dee0e07..9fbe169d5 100644
--- a/tests/yield/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/yield/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`conditional.js 1`] = `
+exports[`conditional.js-babylon 1`] = `
 "function* f() {
   a = (yield) ? 1 : 1;
   a = yield 1 ? 1 : 1;
@@ -43,7 +43,7 @@ async function f() {
 "
 `;
 
-exports[`conditional.js 2`] = `
+exports[`conditional.js-typescript 1`] = `
 "function* f() {
   a = (yield) ? 1 : 1;
   a = yield 1 ? 1 : 1;
diff --git a/tests_config/run_spec.js b/tests_config/run_spec.js
index a8c1469de..e7fffd3a1 100644
--- a/tests_config/run_spec.js
+++ b/tests_config/run_spec.js
@@ -18,6 +18,13 @@ function removeEmptyStatements(ast) {
   });
 }
 
+function getParserOrDefault(options)  {
+  if (!options || !options.parser) {
+    return 'flow';
+  }
+  return options.parser;
+}
+
 function run_spec(dirname, options) {
   fs.readdirSync(dirname).forEach(filename => {
     if ((filename.endsWith('.js') || filename.endsWith('.ts')) && filename !== 'jsfmt.spec.js') {
@@ -26,7 +33,8 @@ function run_spec(dirname, options) {
       if (!RUN_AST_TESTS) {
         const source = read(path).replace(/\r\n/g, '\n');
         const output = prettyprint(source, path, options || {});
-        test(filename, () => {
+        const parserFilename = filename + "-" + getParserOrDefault(options);
+        test(parserFilename, () => {
           expect(source + '~'.repeat(80) + '\n' + output).toMatchSnapshot();
         });
       }
@@ -82,7 +90,7 @@ function parse(string) {
 function prettyprint(src, filename, options) {
   return prettier.format(src, Object.assign({
     filename,
-    parser: 'flow',
+    parser: getParserOrDefault(),
     printWidth: 80,
   }, options));
 }