diff --git a/src/language-js/parse/babel.js b/src/language-js/parse/babel.js
index 8e901e995..88c02de4f 100644
--- a/src/language-js/parse/babel.js
+++ b/src/language-js/parse/babel.js
@@ -26,6 +26,7 @@ const parseOptions = {
   allowUndeclaredExports: true,
   errorRecovery: true,
   createParenthesizedExpressions: true,
+  createImportExpressions: true,
   plugins: [
     // When adding a plugin, please add a test in `tests/format/js/babel-plugins`,
     // To remove plugins, remove it here and run `yarn test tests/format/js/babel-plugins` to verify
@@ -45,6 +46,8 @@ const parseOptions = {
     "importReflection",
     "explicitResourceManagement",
     ["importAttributes", { deprecatedAssertSyntax: true }],
+    "sourcePhaseImports",
+    "deferredImportEvaluation",
     ["optionalChainingAssign", { version: "2023-07" }],
   ],
   tokens: true,
diff --git a/src/language-js/print/call-expression.js b/src/language-js/print/call-expression.js
index 77dc92ef5..3b2755447 100644
--- a/src/language-js/print/call-expression.js
+++ b/src/language-js/print/call-expression.js
@@ -68,7 +68,7 @@ function printCallExpression(path, options, print) {
 
   const contents = [
     isNew ? "new " : "",
-    isDynamicImport ? "import" : print("callee"),
+    isDynamicImport ? printDynamicImportCallee(node) : print("callee"),
     optional,
     printFunctionTypeParameters(path, options, print),
     printCallArguments(path, options, print),
@@ -83,6 +83,13 @@ function printCallExpression(path, options, print) {
   return contents;
 }
 
+function printDynamicImportCallee(node) {
+  if (!node.phase) {
+    return "import";
+  }
+  return `import.${node.phase}`;
+}
+
 function isCommonsJsOrAmdCall(node, parentNode) {
   if (node.callee.type !== "Identifier") {
     return false;
diff --git a/src/language-js/print/module.js b/src/language-js/print/module.js
index fdae117fe..f5ffd1697 100644
--- a/src/language-js/print/module.js
+++ b/src/language-js/print/module.js
@@ -34,6 +34,7 @@ function printImportDeclaration(path, options, print) {
   return [
     "import",
     node.module ? " module" : "",
+    node.phase ? ` ${node.phase}` : "",
     printImportKind(node),
     printModuleSpecifiers(path, options, print),
     printModuleSource(path, options, print),
diff --git a/src/language-js/utils/index.js b/src/language-js/utils/index.js
index 754c0a99e..864fbd7a4 100644
--- a/src/language-js/utils/index.js
+++ b/src/language-js/utils/index.js
@@ -1050,9 +1050,15 @@ function getCallArguments(node) {
   if (node.type === "ImportExpression") {
     args = [node.source];
 
+    // import attributes
     if (node.attributes) {
       args.push(node.attributes);
     }
+
+    // deprecated import assertions
+    if (node.options) {
+      args.push(node.options);
+    }
   }
 
   callArgumentsCache.set(node, args);
@@ -1064,9 +1070,15 @@ function iterateCallArgumentsPath(path, iteratee) {
   if (node.type === "ImportExpression") {
     path.call((sourcePath) => iteratee(sourcePath, 0), "source");
 
+    // import attributes
     if (node.attributes) {
       path.call((sourcePath) => iteratee(sourcePath, 1), "attributes");
     }
+
+    // deprecated import assertions
+    if (node.options) {
+      path.call((sourcePath) => iteratee(sourcePath, 1), "options");
+    }
   } else {
     path.each(iteratee, "arguments");
   }
@@ -1074,12 +1086,17 @@ function iterateCallArgumentsPath(path, iteratee) {
 
 function getCallArgumentSelector(node, index) {
   if (node.type === "ImportExpression") {
-    if (index === 0 || index === (node.attributes ? -2 : -1)) {
+    if (index === 0 || index === (node.attributes || node.options ? -2 : -1)) {
       return "source";
     }
+    // import attributes
     if (node.attributes && (index === 1 || index === -1)) {
       return "attributes";
     }
+    // deprecated import assertions
+    if (node.options && (index === 1 || index === -1)) {
+      return "options";
+    }
     throw new RangeError("Invalid argument index");
   }
   if (index < 0) {
diff --git a/tests/format/js/babel-plugins/__snapshots__/jsfmt.spec.js.snap b/tests/format/js/babel-plugins/__snapshots__/jsfmt.spec.js.snap
index 99ddbe419..2170d484e 100644
--- a/tests/format/js/babel-plugins/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/format/js/babel-plugins/__snapshots__/jsfmt.spec.js.snap
@@ -651,6 +651,41 @@ function enumerable(value) {
 ================================================================================
 `;
 
+exports[`deferred-import-evaluation.js [acorn] format 1`] = `
+"Unexpected token (1:14)
+> 1 | import defer * as ns from "x";
+    |              ^
+  2 |"
+`;
+
+exports[`deferred-import-evaluation.js [espree] format 1`] = `
+"Unexpected token * (1:14)
+> 1 | import defer * as ns from "x";
+    |              ^
+  2 |"
+`;
+
+exports[`deferred-import-evaluation.js [meriyah] format 1`] = `
+"Import source must be string (1:14)
+> 1 | import defer * as ns from "x";
+    |              ^
+  2 |"
+`;
+
+exports[`deferred-import-evaluation.js format 1`] = `
+====================================options=====================================
+parsers: ["babel", "babel-ts", "babel-flow"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+import defer * as ns from "x";
+
+=====================================output=====================================
+import defer * as ns from "x";
+
+================================================================================
+`;
+
 exports[`destructuring-private.js [acorn] format 1`] = `
 "Unexpected token (5:13)
   3 |   constructor() {
@@ -2496,6 +2531,46 @@ const re = /^(?i:[a-z])[a-z]$/;
 ================================================================================
 `;
 
+exports[`source-phase-imports.js [acorn] format 1`] = `
+"Unexpected token (1:15)
+> 1 | import source fooSource from "foo";
+    |               ^
+  2 | import.source("x");
+  3 |"
+`;
+
+exports[`source-phase-imports.js [espree] format 1`] = `
+"Unexpected token fooSource (1:15)
+> 1 | import source fooSource from "foo";
+    |               ^
+  2 | import.source("x");
+  3 |"
+`;
+
+exports[`source-phase-imports.js [meriyah] format 1`] = `
+"Import source must be string (1:23)
+> 1 | import source fooSource from "foo";
+    |                       ^
+  2 | import.source("x");
+  3 |"
+`;
+
+exports[`source-phase-imports.js format 1`] = `
+====================================options=====================================
+parsers: ["babel", "babel-ts", "babel-flow"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+import source fooSource from "foo";
+import.source("x");
+
+=====================================output=====================================
+import source fooSource from "foo";
+import.source("x");
+
+================================================================================
+`;
+
 exports[`throw-expressions.js [acorn] format 1`] = `
 "Unexpected token (3:23)
   1 | // https://babeljs.io/docs/en/babel-plugin-proposal-throw-expressions
diff --git a/tests/format/js/babel-plugins/deferred-import-evaluation.js b/tests/format/js/babel-plugins/deferred-import-evaluation.js
new file mode 100644
index 000000000..806ae2bb7
--- /dev/null
+++ b/tests/format/js/babel-plugins/deferred-import-evaluation.js
@@ -0,0 +1 @@
+import defer * as ns from "x";
diff --git a/tests/format/js/babel-plugins/jsfmt.spec.js b/tests/format/js/babel-plugins/jsfmt.spec.js
index 5aeacace8..c59b8a2f6 100644
--- a/tests/format/js/babel-plugins/jsfmt.spec.js
+++ b/tests/format/js/babel-plugins/jsfmt.spec.js
@@ -31,6 +31,8 @@ run_spec(import.meta, ["babel", "babel-ts", "babel-flow"], {
       "import-reflection.js",
       "explicit-resource-management.js",
       "regexp-modifiers.js",
+      "source-phase-imports.js",
+      "deferred-import-evaluation.js",
       "optional-chaining-assignment.js",
     ],
     espree: [
@@ -61,6 +63,8 @@ run_spec(import.meta, ["babel", "babel-ts", "babel-flow"], {
       "import-reflection.js",
       "explicit-resource-management.js",
       "regexp-modifiers.js",
+      "source-phase-imports.js",
+      "deferred-import-evaluation.js",
       "optional-chaining-assignment.js",
     ],
     meriyah: [
@@ -93,6 +97,8 @@ run_spec(import.meta, ["babel", "babel-ts", "babel-flow"], {
       "import-reflection.js",
       "explicit-resource-management.js",
       "regexp-modifiers.js",
+      "source-phase-imports.js",
+      "deferred-import-evaluation.js",
       "optional-chaining-assignment.js",
     ],
     babel: ["flow.js", "typescript.js"],
diff --git a/tests/format/js/babel-plugins/source-phase-imports.js b/tests/format/js/babel-plugins/source-phase-imports.js
new file mode 100644
index 000000000..fe8697e02
--- /dev/null
+++ b/tests/format/js/babel-plugins/source-phase-imports.js
@@ -0,0 +1,2 @@
+import source fooSource from "foo";
+import.source("x");
diff --git a/tests/format/js/deferred-import-evaluation/__snapshots__/jsfmt.spec.js.snap b/tests/format/js/deferred-import-evaluation/__snapshots__/jsfmt.spec.js.snap
new file mode 100644
index 000000000..082f67737
--- /dev/null
+++ b/tests/format/js/deferred-import-evaluation/__snapshots__/jsfmt.spec.js.snap
@@ -0,0 +1,141 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`import-defer.js [acorn] format 1`] = `
+"Unexpected token (1:14)
+> 1 | import defer * as ns from "x";
+    |              ^
+  2 |"
+`;
+
+exports[`import-defer.js [espree] format 1`] = `
+"Unexpected token * (1:14)
+> 1 | import defer * as ns from "x";
+    |              ^
+  2 |"
+`;
+
+exports[`import-defer.js [meriyah] format 1`] = `
+"Import source must be string (1:14)
+> 1 | import defer * as ns from "x";
+    |              ^
+  2 |"
+`;
+
+exports[`import-defer.js format 1`] = `
+====================================options=====================================
+parsers: ["babel"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+import defer * as ns from "x";
+
+=====================================output=====================================
+import defer * as ns from "x";
+
+================================================================================
+`;
+
+exports[`import-defer-attributes-declaration.js [acorn] format 1`] = `
+"Unexpected token (1:14)
+> 1 | import defer * as ns from "x" with { attr: "val" };
+    |              ^
+  2 |"
+`;
+
+exports[`import-defer-attributes-declaration.js [espree] format 1`] = `
+"Unexpected token * (1:14)
+> 1 | import defer * as ns from "x" with { attr: "val" };
+    |              ^
+  2 |"
+`;
+
+exports[`import-defer-attributes-declaration.js [meriyah] format 1`] = `
+"Import source must be string (1:14)
+> 1 | import defer * as ns from "x" with { attr: "val" };
+    |              ^
+  2 |"
+`;
+
+exports[`import-defer-attributes-declaration.js format 1`] = `
+====================================options=====================================
+parsers: ["babel"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+import defer * as ns from "x" with { attr: "val" };
+
+=====================================output=====================================
+import defer * as ns from "x" with { attr: "val" };
+
+================================================================================
+`;
+
+exports[`no-default.js [__babel_estree] format 1`] = `
+"Only \`import defer * as x from "./module"\` is valid. (1:14)
+> 1 | import defer x from "x";
+    |              ^
+  2 |"
+`;
+
+exports[`no-default.js [acorn] format 1`] = `
+"Unexpected token (1:14)
+> 1 | import defer x from "x";
+    |              ^
+  2 |"
+`;
+
+exports[`no-default.js [babel] format 1`] = `
+"Only \`import defer * as x from "./module"\` is valid. (1:14)
+> 1 | import defer x from "x";
+    |              ^
+  2 |"
+`;
+
+exports[`no-default.js [espree] format 1`] = `
+"Unexpected token x (1:14)
+> 1 | import defer x from "x";
+    |              ^
+  2 |"
+`;
+
+exports[`no-default.js [meriyah] format 1`] = `
+"Import source must be string (1:14)
+> 1 | import defer x from "x";
+    |              ^
+  2 |"
+`;
+
+exports[`no-named.js [__babel_estree] format 1`] = `
+"Only \`import defer * as x from "./module"\` is valid. (1:16)
+> 1 | import defer { x } from "x";
+    |                ^
+  2 |"
+`;
+
+exports[`no-named.js [acorn] format 1`] = `
+"Unexpected token (1:14)
+> 1 | import defer { x } from "x";
+    |              ^
+  2 |"
+`;
+
+exports[`no-named.js [babel] format 1`] = `
+"Only \`import defer * as x from "./module"\` is valid. (1:16)
+> 1 | import defer { x } from "x";
+    |                ^
+  2 |"
+`;
+
+exports[`no-named.js [espree] format 1`] = `
+"Unexpected token { (1:14)
+> 1 | import defer { x } from "x";
+    |              ^
+  2 |"
+`;
+
+exports[`no-named.js [meriyah] format 1`] = `
+"Import source must be string (1:14)
+> 1 | import defer { x } from "x";
+    |              ^
+  2 |"
+`;
diff --git a/tests/format/js/deferred-import-evaluation/import-defer-attributes-declaration.js b/tests/format/js/deferred-import-evaluation/import-defer-attributes-declaration.js
new file mode 100644
index 000000000..e8e5628b5
--- /dev/null
+++ b/tests/format/js/deferred-import-evaluation/import-defer-attributes-declaration.js
@@ -0,0 +1 @@
+import defer * as ns from "x" with { attr: "val" };
diff --git a/tests/format/js/deferred-import-evaluation/import-defer.js b/tests/format/js/deferred-import-evaluation/import-defer.js
new file mode 100644
index 000000000..806ae2bb7
--- /dev/null
+++ b/tests/format/js/deferred-import-evaluation/import-defer.js
@@ -0,0 +1 @@
+import defer * as ns from "x";
diff --git a/tests/format/js/deferred-import-evaluation/jsfmt.spec.js b/tests/format/js/deferred-import-evaluation/jsfmt.spec.js
new file mode 100644
index 000000000..bb7a108f8
--- /dev/null
+++ b/tests/format/js/deferred-import-evaluation/jsfmt.spec.js
@@ -0,0 +1,15 @@
+const importDeferTests = [
+  "import-defer.js",
+  "import-defer-attributes-declaration.js",
+];
+const invalidSyntaxTests = ["no-default.js", "no-named.js"];
+
+run_spec(import.meta, ["babel"], {
+  errors: {
+    acorn: [...importDeferTests, ...invalidSyntaxTests],
+    espree: [...importDeferTests, ...invalidSyntaxTests],
+    meriyah: [...importDeferTests, ...invalidSyntaxTests],
+    babel: invalidSyntaxTests,
+    __babel_estree: invalidSyntaxTests,
+  },
+});
diff --git a/tests/format/js/deferred-import-evaluation/no-default.js b/tests/format/js/deferred-import-evaluation/no-default.js
new file mode 100644
index 000000000..d96ed9fc9
--- /dev/null
+++ b/tests/format/js/deferred-import-evaluation/no-default.js
@@ -0,0 +1 @@
+import defer x from "x";
diff --git a/tests/format/js/deferred-import-evaluation/no-named.js b/tests/format/js/deferred-import-evaluation/no-named.js
new file mode 100644
index 000000000..5c307da2a
--- /dev/null
+++ b/tests/format/js/deferred-import-evaluation/no-named.js
@@ -0,0 +1 @@
+import defer { x } from "x";
diff --git a/tests/format/js/source-phase-imports/__snapshots__/jsfmt.spec.js.snap b/tests/format/js/source-phase-imports/__snapshots__/jsfmt.spec.js.snap
new file mode 100644
index 000000000..70cd79bfc
--- /dev/null
+++ b/tests/format/js/source-phase-imports/__snapshots__/jsfmt.spec.js.snap
@@ -0,0 +1,295 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`default-binding.js format 1`] = `
+====================================options=====================================
+parsers: ["babel"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+import source from "x";
+
+=====================================output=====================================
+import source from "x";
+
+================================================================================
+`;
+
+exports[`import-source.js [acorn] format 1`] = `
+"Unexpected token (1:15)
+> 1 | import source x from "x";
+    |               ^
+  2 |"
+`;
+
+exports[`import-source.js [espree] format 1`] = `
+"Unexpected token x (1:15)
+> 1 | import source x from "x";
+    |               ^
+  2 |"
+`;
+
+exports[`import-source.js [meriyah] format 1`] = `
+"Import source must be string (1:15)
+> 1 | import source x from "x";
+    |               ^
+  2 |"
+`;
+
+exports[`import-source.js format 1`] = `
+====================================options=====================================
+parsers: ["babel"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+import source x from "x";
+
+=====================================output=====================================
+import source x from "x";
+
+================================================================================
+`;
+
+exports[`import-source-attributes-declaration.js [acorn] format 1`] = `
+"Unexpected token (1:15)
+> 1 | import source s from "x" with { attr: "val" };
+    |               ^
+  2 |"
+`;
+
+exports[`import-source-attributes-declaration.js [espree] format 1`] = `
+"Unexpected token s (1:15)
+> 1 | import source s from "x" with { attr: "val" };
+    |               ^
+  2 |"
+`;
+
+exports[`import-source-attributes-declaration.js [meriyah] format 1`] = `
+"Import source must be string (1:15)
+> 1 | import source s from "x" with { attr: "val" };
+    |               ^
+  2 |"
+`;
+
+exports[`import-source-attributes-declaration.js format 1`] = `
+====================================options=====================================
+parsers: ["babel"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+import source s from "x" with { attr: "val" };
+
+=====================================output=====================================
+import source s from "x" with { attr: "val" };
+
+================================================================================
+`;
+
+exports[`import-source-attributes-expression.js [acorn] format 1`] = `
+"The only valid meta property for import is 'import.meta' (1:8)
+> 1 | import.source("x", { with: { attr: "val" } });
+    |        ^
+  2 |"
+`;
+
+exports[`import-source-attributes-expression.js [espree] format 1`] = `
+"The only valid meta property for import is 'import.meta' (1:8)
+> 1 | import.source("x", { with: { attr: "val" } });
+    |        ^
+  2 |"
+`;
+
+exports[`import-source-attributes-expression.js [meriyah] format 1`] = `
+"Unexpected token: 'identifier' (1:13)
+> 1 | import.source("x", { with: { attr: "val" } });
+    |             ^
+  2 |"
+`;
+
+exports[`import-source-attributes-expression.js format 1`] = `
+====================================options=====================================
+parsers: ["babel"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+import.source("x", { with: { attr: "val" } });
+
+=====================================output=====================================
+import.source("x", { with: { attr: "val" } });
+
+================================================================================
+`;
+
+exports[`import-source-binding-from.js [acorn] format 1`] = `
+"Unexpected token (1:20)
+> 1 | import source from from "x";
+    |                    ^
+  2 |"
+`;
+
+exports[`import-source-binding-from.js [espree] format 1`] = `
+"Unexpected token from (1:20)
+> 1 | import source from from "x";
+    |                    ^
+  2 |"
+`;
+
+exports[`import-source-binding-from.js [meriyah] format 1`] = `
+"Import source must be string (1:23)
+> 1 | import source from from "x";
+    |                       ^
+  2 |"
+`;
+
+exports[`import-source-binding-from.js format 1`] = `
+====================================options=====================================
+parsers: ["babel"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+import source from from "x";
+
+=====================================output=====================================
+import source from from "x";
+
+================================================================================
+`;
+
+exports[`import-source-binding-source.js [acorn] format 1`] = `
+"Unexpected token (1:15)
+> 1 | import source source from "x";
+    |               ^
+  2 |"
+`;
+
+exports[`import-source-binding-source.js [espree] format 1`] = `
+"Unexpected token source (1:15)
+> 1 | import source source from "x";
+    |               ^
+  2 |"
+`;
+
+exports[`import-source-binding-source.js [meriyah] format 1`] = `
+"Import source must be string (1:20)
+> 1 | import source source from "x";
+    |                    ^
+  2 |"
+`;
+
+exports[`import-source-binding-source.js format 1`] = `
+====================================options=====================================
+parsers: ["babel"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+import source source from "x";
+
+=====================================output=====================================
+import source source from "x";
+
+================================================================================
+`;
+
+exports[`import-source-dynamic-import.js [acorn] format 1`] = `
+"The only valid meta property for import is 'import.meta' (1:8)
+> 1 | import.source("foo");
+    |        ^
+  2 |"
+`;
+
+exports[`import-source-dynamic-import.js [espree] format 1`] = `
+"The only valid meta property for import is 'import.meta' (1:8)
+> 1 | import.source("foo");
+    |        ^
+  2 |"
+`;
+
+exports[`import-source-dynamic-import.js [meriyah] format 1`] = `
+"Unexpected token: 'identifier' (1:13)
+> 1 | import.source("foo");
+    |             ^
+  2 |"
+`;
+
+exports[`import-source-dynamic-import.js format 1`] = `
+====================================options=====================================
+parsers: ["babel"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+import.source("foo");
+
+=====================================output=====================================
+import.source("foo");
+
+================================================================================
+`;
+
+exports[`no-named.js [__babel_estree] format 1`] = `
+"Only \`import source x from "./module"\` is valid. (1:17)
+> 1 | import source { x } from "x";
+    |                 ^
+  2 |"
+`;
+
+exports[`no-named.js [acorn] format 1`] = `
+"Unexpected token (1:15)
+> 1 | import source { x } from "x";
+    |               ^
+  2 |"
+`;
+
+exports[`no-named.js [babel] format 1`] = `
+"Only \`import source x from "./module"\` is valid. (1:17)
+> 1 | import source { x } from "x";
+    |                 ^
+  2 |"
+`;
+
+exports[`no-named.js [espree] format 1`] = `
+"Unexpected token { (1:15)
+> 1 | import source { x } from "x";
+    |               ^
+  2 |"
+`;
+
+exports[`no-named.js [meriyah] format 1`] = `
+"Import source must be string (1:15)
+> 1 | import source { x } from "x";
+    |               ^
+  2 |"
+`;
+
+exports[`no-namespace.js [__babel_estree] format 1`] = `
+"Only \`import source x from "./module"\` is valid. (1:15)
+> 1 | import source * as x from "x";
+    |               ^
+  2 |"
+`;
+
+exports[`no-namespace.js [acorn] format 1`] = `
+"Unexpected token (1:15)
+> 1 | import source * as x from "x";
+    |               ^
+  2 |"
+`;
+
+exports[`no-namespace.js [babel] format 1`] = `
+"Only \`import source x from "./module"\` is valid. (1:15)
+> 1 | import source * as x from "x";
+    |               ^
+  2 |"
+`;
+
+exports[`no-namespace.js [espree] format 1`] = `
+"Unexpected token * (1:15)
+> 1 | import source * as x from "x";
+    |               ^
+  2 |"
+`;
+
+exports[`no-namespace.js [meriyah] format 1`] = `
+"Import source must be string (1:15)
+> 1 | import source * as x from "x";
+    |               ^
+  2 |"
+`;
diff --git a/tests/format/js/source-phase-imports/default-binding.js b/tests/format/js/source-phase-imports/default-binding.js
new file mode 100644
index 000000000..a88842d5e
--- /dev/null
+++ b/tests/format/js/source-phase-imports/default-binding.js
@@ -0,0 +1 @@
+import source from "x";
diff --git a/tests/format/js/source-phase-imports/import-source-attributes-declaration.js b/tests/format/js/source-phase-imports/import-source-attributes-declaration.js
new file mode 100644
index 000000000..d2b020b59
--- /dev/null
+++ b/tests/format/js/source-phase-imports/import-source-attributes-declaration.js
@@ -0,0 +1 @@
+import source s from "x" with { attr: "val" };
diff --git a/tests/format/js/source-phase-imports/import-source-attributes-expression.js b/tests/format/js/source-phase-imports/import-source-attributes-expression.js
new file mode 100644
index 000000000..329aa1d6c
--- /dev/null
+++ b/tests/format/js/source-phase-imports/import-source-attributes-expression.js
@@ -0,0 +1 @@
+import.source("x", { with: { attr: "val" } });
diff --git a/tests/format/js/source-phase-imports/import-source-binding-from.js b/tests/format/js/source-phase-imports/import-source-binding-from.js
new file mode 100644
index 000000000..a5c6af299
--- /dev/null
+++ b/tests/format/js/source-phase-imports/import-source-binding-from.js
@@ -0,0 +1 @@
+import source from from "x";
diff --git a/tests/format/js/source-phase-imports/import-source-binding-source.js b/tests/format/js/source-phase-imports/import-source-binding-source.js
new file mode 100644
index 000000000..426fb0a9a
--- /dev/null
+++ b/tests/format/js/source-phase-imports/import-source-binding-source.js
@@ -0,0 +1 @@
+import source source from "x";
diff --git a/tests/format/js/source-phase-imports/import-source-dynamic-import.js b/tests/format/js/source-phase-imports/import-source-dynamic-import.js
new file mode 100644
index 000000000..05a554458
--- /dev/null
+++ b/tests/format/js/source-phase-imports/import-source-dynamic-import.js
@@ -0,0 +1 @@
+import.source("foo");
diff --git a/tests/format/js/source-phase-imports/import-source.js b/tests/format/js/source-phase-imports/import-source.js
new file mode 100644
index 000000000..6cfa837a5
--- /dev/null
+++ b/tests/format/js/source-phase-imports/import-source.js
@@ -0,0 +1 @@
+import source x from "x";
diff --git a/tests/format/js/source-phase-imports/jsfmt.spec.js b/tests/format/js/source-phase-imports/jsfmt.spec.js
new file mode 100644
index 000000000..3b425b082
--- /dev/null
+++ b/tests/format/js/source-phase-imports/jsfmt.spec.js
@@ -0,0 +1,19 @@
+const importSourceTests = [
+  "import-source-attributes-declaration.js",
+  "import-source-attributes-expression.js",
+  "import-source-binding-from.js",
+  "import-source-binding-source.js",
+  "import-source-dynamic-import.js",
+  "import-source.js",
+];
+const invalidSyntaxTests = ["no-namespace.js", "no-named.js"];
+
+run_spec(import.meta, ["babel"], {
+  errors: {
+    acorn: [...importSourceTests, ...invalidSyntaxTests],
+    espree: [...importSourceTests, ...invalidSyntaxTests],
+    meriyah: [...importSourceTests, ...invalidSyntaxTests],
+    babel: invalidSyntaxTests,
+    __babel_estree: invalidSyntaxTests,
+  },
+});
diff --git a/tests/format/js/source-phase-imports/no-named.js b/tests/format/js/source-phase-imports/no-named.js
new file mode 100644
index 000000000..1cd5d593c
--- /dev/null
+++ b/tests/format/js/source-phase-imports/no-named.js
@@ -0,0 +1 @@
+import source { x } from "x";
diff --git a/tests/format/js/source-phase-imports/no-namespace.js b/tests/format/js/source-phase-imports/no-namespace.js
new file mode 100644
index 000000000..185a8b107
--- /dev/null
+++ b/tests/format/js/source-phase-imports/no-namespace.js
@@ -0,0 +1 @@
+import source * as x from "x";
diff --git a/tests/format/misc/errors/js/import/__snapshots__/jsfmt.spec.js.snap b/tests/format/misc/errors/js/import/__snapshots__/jsfmt.spec.js.snap
index 353b50835..73c6d58de 100644
--- a/tests/format/misc/errors/js/import/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/format/misc/errors/js/import/__snapshots__/jsfmt.spec.js.snap
@@ -1,21 +1,21 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`snippet: #0 [babel] format 1`] = `
-"\`import()\` requires exactly one or two arguments. (1:1)
+"Unexpected token (1:8)
 > 1 | import();
-    | ^"
+    |        ^"
 `;
 
 exports[`snippet: #0 [babel-flow] format 1`] = `
-"\`import()\` requires exactly one or two arguments. (1:1)
+"Unexpected token (1:8)
 > 1 | import();
-    | ^"
+    |        ^"
 `;
 
 exports[`snippet: #0 [babel-ts] format 1`] = `
-"\`import()\` requires exactly one or two arguments. (1:1)
+"Unexpected token (1:8)
 > 1 | import();
-    | ^"
+    |        ^"
 `;
 
 exports[`snippet: #0 [flow] format 1`] = `
@@ -37,21 +37,21 @@ exports[`snippet: #0 [typescript] format 1`] = `
 `;
 
 exports[`snippet: #1 [babel] format 1`] = `
-"\`import()\` requires exactly one or two arguments. (1:1)
+"Unexpected token (1:21)
 > 1 | import(/* comment */);
-    | ^"
+    |                     ^"
 `;
 
 exports[`snippet: #1 [babel-flow] format 1`] = `
-"\`import()\` requires exactly one or two arguments. (1:1)
+"Unexpected token (1:21)
 > 1 | import(/* comment */);
-    | ^"
+    |                     ^"
 `;
 
 exports[`snippet: #1 [babel-ts] format 1`] = `
-"\`import()\` requires exactly one or two arguments. (1:1)
+"Unexpected token (1:21)
 > 1 | import(/* comment */);
-    | ^"
+    |                     ^"
 `;
 
 exports[`snippet: #1 [flow] format 1`] = `
@@ -109,21 +109,21 @@ exports[`snippet: #2 [typescript] format 1`] = `
 `;
 
 exports[`snippet: #3 [babel] format 1`] = `
-"Cannot use new with import(...). (1:5)
+"Unexpected token (1:12)
 > 1 | new import();
-    |     ^"
+    |            ^"
 `;
 
 exports[`snippet: #3 [babel-flow] format 1`] = `
-"Cannot use new with import(...). (1:5)
+"Unexpected token (1:12)
 > 1 | new import();
-    |     ^"
+    |            ^"
 `;
 
 exports[`snippet: #3 [babel-ts] format 1`] = `
-"Cannot use new with import(...). (1:5)
+"Unexpected token (1:12)
 > 1 | new import();
-    |     ^"
+    |            ^"
 `;
 
 exports[`snippet: #3 [flow] format 1`] = `