diff --git a/src/language-js/parse/flow.js b/src/language-js/parse/flow.js
index b33c75045..4174fb769 100644
--- a/src/language-js/parse/flow.js
+++ b/src/language-js/parse/flow.js
@@ -55,8 +55,13 @@ function createParseError(error) {
   });
 }
 
-function parse(text) {
-  const ast = flowParser.parse(text, parseOptions);
+function parse(text, options) {
+  const filepath = options?.filepath;
+
+  const ast = flowParser.parse(text, {
+    filename: typeof filepath === "string" ? filepath : "prettier.js.flow",
+    ...parseOptions,
+  });
   const [error] = ast.errors;
   if (error) {
     throw createParseError(error);
diff --git a/src/language-js/parse/hermes.js b/src/language-js/parse/hermes.js
index 42e13f49b..d141f32e9 100644
--- a/src/language-js/parse/hermes.js
+++ b/src/language-js/parse/hermes.js
@@ -4,21 +4,20 @@ import postprocess from "./postprocess/index.js";
 import createParser from "./utilities/create-parser.js";
 
 function createParseError(error) {
-  let { message, loc } = error;
+  const { loc } = error;
 
+  /* c8 ignore next 3 */
   if (!loc) {
     return error;
   }
 
   const { line, column } = loc;
+  let [message] = error.message.split("\n");
 
-  message = message.split("\n")[0];
-
-  const suffix = `(${line}:${column})`;
+  const suffix = ` (${line}:${column})`;
   if (message.endsWith(suffix)) {
     message = message.slice(0, -suffix.length);
   }
-  message = message.trim();
 
   return createError(message, {
     loc: {
diff --git a/tests/format/filename-matters/flow-ambient/__snapshots__/format.test.js.snap b/tests/format/filename-matters/flow-ambient/__snapshots__/format.test.js.snap
new file mode 100644
index 000000000..bb35664f6
--- /dev/null
+++ b/tests/format/filename-matters/flow-ambient/__snapshots__/format.test.js.snap
@@ -0,0 +1,47 @@
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+
+exports[`ambient.js.flow [hermes] format 1`] = `
+"missing initializer in const declaration (1:6)
+> 1 | const foo: string;
+    |      ^
+  2 |
+Cause: missing initializer in const declaration (1:6)
+const foo: string;
+      ^~~~~~~~~~~"
+`;
+
+exports[`ambient.js.flow format 1`] = `
+====================================options=====================================
+parsers: ["flow"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+const foo: string;
+
+=====================================output=====================================
+const foo: string;
+
+================================================================================
+`;
+
+exports[`snippet: #0 [hermes] format 1`] = `
+"missing initializer in const declaration (1:6)
+> 1 | const foo: string;
+    |      ^
+Cause: missing initializer in const declaration (1:6)
+const foo: string;
+      ^~~~~~~~~~~"
+`;
+
+exports[`snippet: #0 format 1`] = `
+====================================options=====================================
+parsers: ["flow"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+const foo: string;
+=====================================output=====================================
+const foo: string;
+
+================================================================================
+`;
diff --git a/tests/format/filename-matters/flow-ambient/ambient.js.flow b/tests/format/filename-matters/flow-ambient/ambient.js.flow
new file mode 100644
index 000000000..6821c110c
--- /dev/null
+++ b/tests/format/filename-matters/flow-ambient/ambient.js.flow
@@ -0,0 +1 @@
+const foo: string;
diff --git a/tests/format/filename-matters/flow-ambient/format.test.js b/tests/format/filename-matters/flow-ambient/format.test.js
new file mode 100644
index 000000000..e382c0e71
--- /dev/null
+++ b/tests/format/filename-matters/flow-ambient/format.test.js
@@ -0,0 +1,11 @@
+runFormatTest(
+  {
+    snippets: [
+      // Unknown filename
+      "const foo: string;",
+    ],
+    importMeta: import.meta,
+  },
+  ["flow"],
+  { errors: { hermes: true } },
+);
diff --git a/tests/format/misc/errors/flow/ambient/__snapshots__/format.test.js.snap b/tests/format/misc/errors/flow/ambient/__snapshots__/format.test.js.snap
new file mode 100644
index 000000000..1ad7bb27a
--- /dev/null
+++ b/tests/format/misc/errors/flow/ambient/__snapshots__/format.test.js.snap
@@ -0,0 +1,15 @@
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+
+exports[`ambient.js [flow] format 1`] = `
+"Const must be initialized (1:7)
+> 1 | const foo: string;
+    |       ^^^^^^^^^^^
+  2 |"
+`;
+
+exports[`ambient.unknown [flow] format 1`] = `
+"Const must be initialized (1:7)
+> 1 | const foo: string;
+    |       ^^^^^^^^^^^
+  2 |"
+`;
diff --git a/tests/format/misc/errors/flow/ambient/ambient.js b/tests/format/misc/errors/flow/ambient/ambient.js
new file mode 100644
index 000000000..6821c110c
--- /dev/null
+++ b/tests/format/misc/errors/flow/ambient/ambient.js
@@ -0,0 +1 @@
+const foo: string;
diff --git a/tests/format/misc/errors/flow/ambient/ambient.unknown b/tests/format/misc/errors/flow/ambient/ambient.unknown
new file mode 100644
index 000000000..6821c110c
--- /dev/null
+++ b/tests/format/misc/errors/flow/ambient/ambient.unknown
@@ -0,0 +1 @@
+const foo: string;
diff --git a/tests/format/misc/errors/flow/ambient/format.test.js b/tests/format/misc/errors/flow/ambient/format.test.js
new file mode 100644
index 000000000..55c339883
--- /dev/null
+++ b/tests/format/misc/errors/flow/ambient/format.test.js
@@ -0,0 +1 @@
+runFormatTest(import.meta, ["flow"]);