diff --git a/package.json b/package.json
index 95e94a23e..bdbc5e2ed 100644
--- a/package.json
+++ b/package.json
@@ -88,7 +88,7 @@
     "json5": "2.2.3",
     "leven": "4.1.0",
     "linguist-languages": "9.1.0",
-    "meriyah": "6.1.4",
+    "meriyah": "7.0.0",
     "micromatch": "4.0.8",
     "minimist": "1.2.8",
     "n-readlines": "1.0.1",
diff --git a/scripts/build/shims/method-is-well-formed.js b/scripts/build/shims/method-is-well-formed.js
new file mode 100644
index 000000000..60b76ecf4
--- /dev/null
+++ b/scripts/build/shims/method-is-well-formed.js
@@ -0,0 +1,42 @@
+import { createMethodShim } from "./shared.js";
+
+const LeadSurrogateMin = 0xd800;
+const LeadSurrogateMax = 0xdbff;
+const TrailSurrogateMin = 0xdc00;
+
+const stringIsWellFormed =
+  String.prototype.isWellFormed ??
+  /*
+  This implementation is not verified, should only apply to meriyah package
+  https://github.com/meriyah/meriyah/pull/527
+  */
+  function () {
+    const { length } = this;
+    for (let index = 0; index < length; index++) {
+      const code = this.charCodeAt(index);
+
+      // Single UTF-16 unit
+      if ((code & 0xfc00) !== LeadSurrogateMin) {
+        continue;
+      }
+
+      // unpaired surrogate
+      if (
+        code > LeadSurrogateMax ||
+        ++index >= length ||
+        (this.charCodeAt(index) & 0xfc00) !== TrailSurrogateMin
+      ) {
+        return false;
+      }
+    }
+
+    return true;
+  };
+
+const isWellFormed = createMethodShim("isWellFormed", function () {
+  if (typeof this === "string") {
+    return stringIsWellFormed;
+  }
+});
+
+export default isWellFormed;
diff --git a/scripts/build/transform/index.js b/scripts/build/transform/index.js
index 6a9df77d4..07e82694c 100644
--- a/scripts/build/transform/index.js
+++ b/scripts/build/transform/index.js
@@ -29,16 +29,20 @@ const packageTransforms = new Map([
   ],
   [transforms["object-has-own"], ["@babel/parser", "meriyah"]],
   [transforms["string-raw"], ["camelcase", "@angular/compiler"]],
+  [transforms["method-is-well-formed"], ["meriyah"]],
   /* spell-checker: enable */
 ]);
 
 const allTransforms = Object.values(transforms);
+const sourceTransforms = allTransforms.filter(
+  (transform) => transform !== transforms["method-is-well-formed"],
+);
 const isPackageFile = (file, packageName) =>
   file.startsWith(path.join(PROJECT_ROOT, `node_modules/${packageName}/`));
 
 function getTransforms(original, file) {
   if (file.startsWith(SOURCE_DIR)) {
-    return allTransforms;
+    return sourceTransforms;
   }
 
   const transforms = [];
@@ -52,9 +56,14 @@ function getTransforms(original, file) {
 }
 
 function transform(original, file, buildOptions) {
-  const transforms = getTransforms(original, file, buildOptions).filter(
-    (transform) => !transform.shouldSkip(original, file, buildOptions),
-  );
+  const transforms = // For test
+    (
+      buildOptions.__isSyntaxTransformUnitTest
+        ? allTransforms
+        : getTransforms(original, file, buildOptions)
+    ).filter(
+      (transform) => !transform.shouldSkip(original, file, buildOptions),
+    );
 
   if (transforms.length === 0) {
     return original;
diff --git a/scripts/build/transform/transforms/index.js b/scripts/build/transform/transforms/index.js
index c12059b57..2a08e2e11 100644
--- a/scripts/build/transform/transforms/index.js
+++ b/scripts/build/transform/transforms/index.js
@@ -10,6 +10,8 @@ export { default as "method-find-last-index" } from "./transform-method-find-las
 export { default as "method-replace-all" } from "./transform-method-replace-all.js";
 // Node.js 20
 export { default as "method-to-reversed" } from "./transform-method-to-reversed.js";
+// Node.js 20
+export { default as "method-is-well-formed" } from "./transform-method-is-well-formed.js";
 // Node.js 16.9.0
 export { default as "object-has-own" } from "./transform-object-has-own.js";
 // For performance
diff --git a/scripts/build/transform/transforms/transform-method-is-well-formed.js b/scripts/build/transform/transforms/transform-method-is-well-formed.js
new file mode 100644
index 000000000..d1053659c
--- /dev/null
+++ b/scripts/build/transform/transforms/transform-method-is-well-formed.js
@@ -0,0 +1,8 @@
+import createMethodCallTransform from "./create-method-call-transform.js";
+
+const transformIsWellFormed = createMethodCallTransform({
+  methodName: "isWellFormed",
+  argumentsLength: 0,
+});
+
+export default transformIsWellFormed;
diff --git a/src/language-js/parse/meriyah.js b/src/language-js/parse/meriyah.js
index 14a70a114..5af8ae0b9 100644
--- a/src/language-js/parse/meriyah.js
+++ b/src/language-js/parse/meriyah.js
@@ -9,6 +9,11 @@ import {
   SOURCE_TYPE_MODULE,
 } from "./utils/source-types.js";
 
+/**
+@import {ESTree as MeriyahESTree} from "meriyah";
+@import {SOURCE_TYPE_SCRIPT} from "./utils/source-types.js";
+*/
+
 // https://github.com/meriyah/meriyah/blob/4676f60b6c149d7082bde2c9147f9ae2359c8075/src/parser.ts#L185
 const parseOptions = {
   // Allow module code
@@ -25,8 +30,6 @@ const parseOptions = {
   raw: true,
   // Enabled directives
   directives: true,
-  // Allow return in the global scope
-  globalReturn: true,
   // Enable implied strict mode
   impliedStrict: false,
   // Enable non-standard parenthesized expression node
@@ -37,19 +40,25 @@ const parseOptions = {
   // source: false,
   // Enable React JSX parsing
   jsx: true,
-  // Creates unique key for in ObjectPattern when key value are same
-  uniqueKeyInPattern: false,
+  // Validate regular expressions with runtime, default `true`
+  validateRegex: false,
 };
 
+/**
+@param {string} text
+@param {SOURCE_TYPE_MODULE | SOURCE_TYPE_SCRIPT} sourceType
+*/
 function parseWithOptions(text, sourceType) {
+  /** @type {MeriyahESTree.Comment[]} */
   const comments = [];
 
-  /** @type {any} */
   const ast = meriyahParse(text, {
     ...parseOptions,
-    module: sourceType === SOURCE_TYPE_MODULE,
+    sourceType: sourceType === SOURCE_TYPE_MODULE ? sourceType : "commonjs",
     onComment: comments,
   });
+
+  // @ts-expect-error -- Safe
   ast.comments = comments;
 
   return ast;
diff --git a/tests/config/run-format-test.js b/tests/config/run-format-test.js
index 9bac63e82..64bf003bf 100644
--- a/tests/config/run-format-test.js
+++ b/tests/config/run-format-test.js
@@ -39,7 +39,6 @@ const unstableTests = new Map(
     "flow/hook/hook-type-annotation.js",
     "typescript/prettier-ignore/mapped-types.ts",
     "typescript/prettier-ignore/issue-14238.ts",
-    "js/comments/html-like/comment.js",
     "js/for/continue-and-break-comment-without-blocks.js",
     "js/sequence-expression/parenthesized.js",
     "typescript/satisfies-operators/comments-unstable.ts",
@@ -71,13 +70,6 @@ const meriyahDisabledTests = new Set(
   [
     // Parsing to different ASTs
     "js/decorators/member-expression.js",
-    // Meriyah parse RegExp relay on runtime behavior
-    // The following fails on Node.js < 20
-    "js/babel-plugins/regex-v-flag.js",
-    "js/regex/v-flag.js",
-    "js/regex/d-flag.js",
-    "js/babel-plugins/regexp-modifiers.js",
-    "js/regex/regexp-modifiers.js",
   ].map((file) => path.join(__dirname, "../format", file)),
 );
 const babelTsDisabledTests = new Set(
diff --git a/tests/format/js/babel-plugins/__snapshots__/format.test.js.snap b/tests/format/js/babel-plugins/__snapshots__/format.test.js.snap
index 8b2d6a5a4..fb1323814 100644
--- a/tests/format/js/babel-plugins/__snapshots__/format.test.js.snap
+++ b/tests/format/js/babel-plugins/__snapshots__/format.test.js.snap
@@ -2065,7 +2065,7 @@ let newScore = boundScore(0, 100, add(7, double(person.score)));
 ================================================================================
 `;
 
-exports[`pipeline-operator-hack.js [acorn] format 1`] = `
+exports[`pipeline-operator-hack.cjs [acorn] format 1`] = `
 "Unexpected token (5:3)
   3 |
   4 | return list
@@ -2077,7 +2077,7 @@ exports[`pipeline-operator-hack.js [acorn] format 1`] = `
 Cause: Unexpected token (5:2)"
 `;
 
-exports[`pipeline-operator-hack.js [espree] format 1`] = `
+exports[`pipeline-operator-hack.cjs [espree] format 1`] = `
 "Unexpected token > (5:3)
   3 |
   4 | return list
@@ -2089,7 +2089,7 @@ exports[`pipeline-operator-hack.js [espree] format 1`] = `
 Cause: Unexpected token >"
 `;
 
-exports[`pipeline-operator-hack.js [meriyah] format 1`] = `
+exports[`pipeline-operator-hack.cjs [meriyah] format 1`] = `
 "Unexpected token: '>' (5:3)
   3 |
   4 | return list
@@ -2101,7 +2101,7 @@ exports[`pipeline-operator-hack.js [meriyah] format 1`] = `
 Cause: [5:2-5:3]: Unexpected token: '>'"
 `;
 
-exports[`pipeline-operator-hack.js [oxc] format 1`] = `
+exports[`pipeline-operator-hack.cjs [oxc] format 1`] = `
 "Unexpected token (5:3)
   3 |
   4 | return list
@@ -2112,7 +2112,7 @@ exports[`pipeline-operator-hack.js [oxc] format 1`] = `
   8 | // (The % token isn't final; it might instead be @ or ? or #.)"
 `;
 
-exports[`pipeline-operator-hack.js format 1`] = `
+exports[`pipeline-operator-hack.cjs format 1`] = `
 ====================================options=====================================
 parsers: ["babel", "babel-ts", "babel-flow"]
 printWidth: 80
diff --git a/tests/format/js/babel-plugins/format.test.js b/tests/format/js/babel-plugins/format.test.js
index 967ffd903..438e34a0b 100644
--- a/tests/format/js/babel-plugins/format.test.js
+++ b/tests/format/js/babel-plugins/format.test.js
@@ -15,7 +15,7 @@ runFormatTest(import.meta, ["babel", "babel-ts", "babel-flow"], {
       "partial-application.js",
       "pipeline-operator-fsharp.js",
       "pipeline-operator-minimal.js",
-      "pipeline-operator-hack.js",
+      "pipeline-operator-hack.cjs",
       "throw-expressions.js",
       "typescript.js",
       "v8intrinsic.js",
@@ -39,7 +39,7 @@ runFormatTest(import.meta, ["babel", "babel-ts", "babel-flow"], {
       "partial-application.js",
       "pipeline-operator-fsharp.js",
       "pipeline-operator-minimal.js",
-      "pipeline-operator-hack.js",
+      "pipeline-operator-hack.cjs",
       "throw-expressions.js",
       "typescript.js",
       "v8intrinsic.js",
@@ -63,7 +63,7 @@ runFormatTest(import.meta, ["babel", "babel-ts", "babel-flow"], {
       "partial-application.js",
       "pipeline-operator-fsharp.js",
       "pipeline-operator-minimal.js",
-      "pipeline-operator-hack.js",
+      "pipeline-operator-hack.cjs",
       "throw-expressions.js",
       "typescript.js",
       "v8intrinsic.js",
@@ -71,7 +71,6 @@ runFormatTest(import.meta, ["babel", "babel-ts", "babel-flow"], {
       "module-blocks.js",
       "async-do-expressions.js",
       "explicit-resource-management.js",
-      "regexp-modifiers.js",
       "source-phase-imports.js",
       "deferred-import-evaluation.js",
       "optional-chaining-assignment.js",
@@ -89,7 +88,7 @@ runFormatTest(import.meta, ["babel", "babel-ts", "babel-flow"], {
       "optional-chaining-assignment.js",
       "partial-application.js",
       "pipeline-operator-fsharp.js",
-      "pipeline-operator-hack.js",
+      "pipeline-operator-hack.cjs",
       "pipeline-operator-minimal.js",
       "throw-expressions.js",
       "typescript.js",
@@ -108,7 +107,7 @@ runFormatTest(import.meta, ["babel", "babel-ts", "babel-flow"], {
       "optional-chaining-assignment.js",
       "partial-application.js",
       "pipeline-operator-fsharp.js",
-      "pipeline-operator-hack.js",
+      "pipeline-operator-hack.cjs",
       "pipeline-operator-minimal.js",
       "throw-expressions.js",
       "typescript.js",
diff --git a/tests/format/js/babel-plugins/pipeline-operator-hack.js b/tests/format/js/babel-plugins/pipeline-operator-hack.cjs
similarity index 100%
rename from tests/format/js/babel-plugins/pipeline-operator-hack.js
rename to tests/format/js/babel-plugins/pipeline-operator-hack.cjs
diff --git a/tests/format/js/comments/html-like/__snapshots__/format.test.js.snap b/tests/format/js/comments/html-like/__snapshots__/format.test.js.snap
index e5d82d34e..4c1978476 100644
--- a/tests/format/js/comments/html-like/__snapshots__/format.test.js.snap
+++ b/tests/format/js/comments/html-like/__snapshots__/format.test.js.snap
@@ -11,7 +11,7 @@ alert(1)
 -->
 =====================================output=====================================
 <!--
-alert(1); 
+alert(1);
 -->
 
 ================================================================================
diff --git a/tests/format/js/new-target/__snapshots__/format.test.js.snap b/tests/format/js/new-target/__snapshots__/format.test.js.snap
index 3aeb1e236..6b45d98b4 100644
--- a/tests/format/js/new-target/__snapshots__/format.test.js.snap
+++ b/tests/format/js/new-target/__snapshots__/format.test.js.snap
@@ -33,14 +33,6 @@ const x = new.target;
           ^~~~~~~~~~"
 `;
 
-exports[`outside-functions.js [meriyah] format 1`] = `
-"new.target only allowed within functions or static blocks (1:15)
-> 1 | const x = new.target;
-    |               ^^^^^^
-  2 |
-Cause: [1:14-1:20]: new.target only allowed within functions or static blocks"
-`;
-
 exports[`outside-functions.js format 1`] = `
 ====================================options=====================================
 parsers: ["babel", "flow", "typescript"]
@@ -87,14 +79,6 @@ new.target;
 ^~~~~~~~~~"
 `;
 
-exports[`range.js [meriyah] format 1`] = `
-"new.target only allowed within functions or static blocks (2:5)
-  1 | const x =
-> 2 | new.target;
-    |     ^^^^^^
-Cause: [2:4-2:10]: new.target only allowed within functions or static blocks"
-`;
-
 exports[`range.js format 1`] = `
 ====================================options=====================================
 parsers: ["babel", "flow", "typescript"]
diff --git a/tests/format/js/new-target/format.test.js b/tests/format/js/new-target/format.test.js
index e844ec5ae..d702699de 100644
--- a/tests/format/js/new-target/format.test.js
+++ b/tests/format/js/new-target/format.test.js
@@ -2,7 +2,6 @@ runFormatTest(import.meta, ["babel", "flow", "typescript"], {
   errors: {
     acorn: true,
     espree: true,
-    meriyah: true,
     flow: true,
     hermes: true,
   },
diff --git a/tests/format/js/regex/format.test.js b/tests/format/js/regex/format.test.js
index 1005e8831..67c251cce 100644
--- a/tests/format/js/regex/format.test.js
+++ b/tests/format/js/regex/format.test.js
@@ -1,5 +1 @@
-runFormatTest(import.meta, ["babel", "flow", "typescript"], {
-  errors: {
-    meriyah: ["regexp-modifiers.js"],
-  },
-});
+runFormatTest(import.meta, ["babel", "flow", "typescript"]);
diff --git a/tests/format/misc/errors/js/export-name/__snapshots__/format.test.js.snap b/tests/format/misc/errors/js/export-name/__snapshots__/format.test.js.snap
new file mode 100644
index 000000000..d518688cf
--- /dev/null
+++ b/tests/format/misc/errors/js/export-name/__snapshots__/format.test.js.snap
@@ -0,0 +1,333 @@
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+
+exports[`snippet: #0 [__babel_estree] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:10)
+> 1 | import { "\\uD83C" as b } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:9)"
+`;
+
+exports[`snippet: #0 [acorn] format 1`] = `
+"An export name cannot include a lone surrogate. (1:10)
+> 1 | import { "\\uD83C" as b } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate. (1:9)"
+`;
+
+exports[`snippet: #0 [babel] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:10)
+> 1 | import { "\\uD83C" as b } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:9)"
+`;
+
+exports[`snippet: #0 [babel-flow] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:10)
+> 1 | import { "\\uD83C" as b } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:9)"
+`;
+
+exports[`snippet: #0 [babel-ts] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:10)
+> 1 | import { "\\uD83C" as b } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:9)"
+`;
+
+exports[`snippet: #0 [espree] format 1`] = `
+"An export name cannot include a lone surrogate. (1:10)
+> 1 | import { "\\uD83C" as b } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate."
+`;
+
+exports[`snippet: #0 [espree] format 2`] = `
+"An export name cannot include a lone surrogate. (1:10)
+> 1 | import { "\\uD83C" as b } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate."
+`;
+
+exports[`snippet: #0 [flow] format 1`] = `
+"Unexpected string, expected an identifier (1:10)
+> 1 | import { "\\uD83C" as b } from "./foo";
+    |          ^^^^^^^^"
+`;
+
+exports[`snippet: #0 [hermes] format 1`] = `
+"'identifier' expected in import specifier (1:9)
+> 1 | import { "\\uD83C" as b } from "./foo";
+    |         ^
+Cause: 'identifier' expected in import specifier (1:9)
+import { "\\uD83C" as b } from "./foo";
+       ~~^"
+`;
+
+exports[`snippet: #0 [meriyah] format 1`] = `
+"An export name cannot include a lone surrogate (1:10)
+> 1 | import { "\\uD83C" as b } from "./foo";
+    |          ^^^^^^^^
+Cause: [1:9-1:17]: An export name cannot include a lone surrogate"
+`;
+
+exports[`snippet: #0 [oxc] format 1`] = `
+"An export name cannot include a unicode lone surrogate (1:10)
+> 1 | import { "\\uD83C" as b } from "./foo";
+    |          ^^^^^^^^"
+`;
+
+exports[`snippet: #0 [oxc-ts] format 1`] = `
+"An export name cannot include a unicode lone surrogate (1:10)
+> 1 | import { "\\uD83C" as b } from "./foo";
+    |          ^^^^^^^^"
+`;
+
+exports[`snippet: #1 [__babel_estree] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:10)
+> 1 | export { "\\uD83C" } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:9)"
+`;
+
+exports[`snippet: #1 [acorn] format 1`] = `
+"An export name cannot include a lone surrogate. (1:10)
+> 1 | export { "\\uD83C" } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate. (1:9)"
+`;
+
+exports[`snippet: #1 [babel] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:10)
+> 1 | export { "\\uD83C" } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:9)"
+`;
+
+exports[`snippet: #1 [babel-flow] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:10)
+> 1 | export { "\\uD83C" } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:9)"
+`;
+
+exports[`snippet: #1 [babel-ts] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:10)
+> 1 | export { "\\uD83C" } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:9)"
+`;
+
+exports[`snippet: #1 [espree] format 1`] = `
+"An export name cannot include a lone surrogate. (1:10)
+> 1 | export { "\\uD83C" } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate."
+`;
+
+exports[`snippet: #1 [espree] format 2`] = `
+"An export name cannot include a lone surrogate. (1:10)
+> 1 | export { "\\uD83C" } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate."
+`;
+
+exports[`snippet: #1 [flow] format 1`] = `
+"Unexpected string, expected an identifier (1:10)
+> 1 | export { "\\uD83C" } from "./foo";
+    |          ^^^^^^^^"
+`;
+
+exports[`snippet: #1 [hermes] format 1`] = `
+"'identifier' expected in export clause (1:9)
+> 1 | export { "\\uD83C" } from "./foo";
+    |         ^
+Cause: 'identifier' expected in export clause (1:9)
+export { "\\uD83C" } from "./foo";
+       ~~^"
+`;
+
+exports[`snippet: #1 [meriyah] format 1`] = `
+"An export name cannot include a lone surrogate (1:10)
+> 1 | export { "\\uD83C" } from "./foo";
+    |          ^^^^^^^^
+Cause: [1:9-1:17]: An export name cannot include a lone surrogate"
+`;
+
+exports[`snippet: #1 [oxc] format 1`] = `
+"An export name cannot include a unicode lone surrogate (1:10)
+> 1 | export { "\\uD83C" } from "./foo";
+    |          ^^^^^^^^"
+`;
+
+exports[`snippet: #1 [oxc-ts] format 1`] = `
+"An export name cannot include a unicode lone surrogate (1:10)
+> 1 | export { "\\uD83C" } from "./foo";
+    |          ^^^^^^^^"
+`;
+
+exports[`snippet: #2 [__babel_estree] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:10)
+> 1 | export { "\\uD83C" as b } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:9)"
+`;
+
+exports[`snippet: #2 [acorn] format 1`] = `
+"An export name cannot include a lone surrogate. (1:10)
+> 1 | export { "\\uD83C" as b } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate. (1:9)"
+`;
+
+exports[`snippet: #2 [babel] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:10)
+> 1 | export { "\\uD83C" as b } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:9)"
+`;
+
+exports[`snippet: #2 [babel-flow] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:10)
+> 1 | export { "\\uD83C" as b } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:9)"
+`;
+
+exports[`snippet: #2 [babel-ts] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:10)
+> 1 | export { "\\uD83C" as b } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:9)"
+`;
+
+exports[`snippet: #2 [espree] format 1`] = `
+"An export name cannot include a lone surrogate. (1:10)
+> 1 | export { "\\uD83C" as b } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate."
+`;
+
+exports[`snippet: #2 [espree] format 2`] = `
+"An export name cannot include a lone surrogate. (1:10)
+> 1 | export { "\\uD83C" as b } from "./foo";
+    |          ^
+Cause: An export name cannot include a lone surrogate."
+`;
+
+exports[`snippet: #2 [flow] format 1`] = `
+"Unexpected string, expected an identifier (1:10)
+> 1 | export { "\\uD83C" as b } from "./foo";
+    |          ^^^^^^^^"
+`;
+
+exports[`snippet: #2 [hermes] format 1`] = `
+"'identifier' expected in export clause (1:9)
+> 1 | export { "\\uD83C" as b } from "./foo";
+    |         ^
+Cause: 'identifier' expected in export clause (1:9)
+export { "\\uD83C" as b } from "./foo";
+       ~~^"
+`;
+
+exports[`snippet: #2 [meriyah] format 1`] = `
+"An export name cannot include a lone surrogate (1:10)
+> 1 | export { "\\uD83C" as b } from "./foo";
+    |          ^^^^^^^^
+Cause: [1:9-1:17]: An export name cannot include a lone surrogate"
+`;
+
+exports[`snippet: #2 [oxc] format 1`] = `
+"An export name cannot include a unicode lone surrogate (1:10)
+> 1 | export { "\\uD83C" as b } from "./foo";
+    |          ^^^^^^^^"
+`;
+
+exports[`snippet: #2 [oxc-ts] format 1`] = `
+"An export name cannot include a unicode lone surrogate (1:10)
+> 1 | export { "\\uD83C" as b } from "./foo";
+    |          ^^^^^^^^"
+`;
+
+exports[`snippet: #3 [__babel_estree] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:15)
+> 1 | export { b as "\\uD83C" } from "./foo";
+    |               ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:14)"
+`;
+
+exports[`snippet: #3 [acorn] format 1`] = `
+"An export name cannot include a lone surrogate. (1:15)
+> 1 | export { b as "\\uD83C" } from "./foo";
+    |               ^
+Cause: An export name cannot include a lone surrogate. (1:14)"
+`;
+
+exports[`snippet: #3 [babel] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:15)
+> 1 | export { b as "\\uD83C" } from "./foo";
+    |               ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:14)"
+`;
+
+exports[`snippet: #3 [babel-flow] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:15)
+> 1 | export { b as "\\uD83C" } from "./foo";
+    |               ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:14)"
+`;
+
+exports[`snippet: #3 [babel-ts] format 1`] = `
+"An export name cannot include a lone surrogate, found '\\ud83c'. (1:15)
+> 1 | export { b as "\\uD83C" } from "./foo";
+    |               ^
+Cause: An export name cannot include a lone surrogate, found '\\ud83c'. (1:14)"
+`;
+
+exports[`snippet: #3 [espree] format 1`] = `
+"An export name cannot include a lone surrogate. (1:15)
+> 1 | export { b as "\\uD83C" } from "./foo";
+    |               ^
+Cause: An export name cannot include a lone surrogate."
+`;
+
+exports[`snippet: #3 [espree] format 2`] = `
+"An export name cannot include a lone surrogate. (1:15)
+> 1 | export { b as "\\uD83C" } from "./foo";
+    |               ^
+Cause: An export name cannot include a lone surrogate."
+`;
+
+exports[`snippet: #3 [flow] format 1`] = `
+"Unexpected string, expected an identifier (1:15)
+> 1 | export { b as "\\uD83C" } from "./foo";
+    |               ^^^^^^^^"
+`;
+
+exports[`snippet: #3 [hermes] format 1`] = `
+"'identifier' expected in export clause (1:14)
+> 1 | export { b as "\\uD83C" } from "./foo";
+    |              ^
+Cause: 'identifier' expected in export clause (1:14)
+export { b as "\\uD83C" } from "./foo";
+       ~~~~~~~^"
+`;
+
+exports[`snippet: #3 [meriyah] format 1`] = `
+"An export name cannot include a lone surrogate (1:15)
+> 1 | export { b as "\\uD83C" } from "./foo";
+    |               ^^^^^^^^
+Cause: [1:14-1:22]: An export name cannot include a lone surrogate"
+`;
+
+exports[`snippet: #3 [oxc] format 1`] = `
+"An export name cannot include a unicode lone surrogate (1:15)
+> 1 | export { b as "\\uD83C" } from "./foo";
+    |               ^^^^^^^^"
+`;
+
+exports[`snippet: #3 [oxc-ts] format 1`] = `
+"An export name cannot include a unicode lone surrogate (1:15)
+> 1 | export { b as "\\uD83C" } from "./foo";
+    |               ^^^^^^^^"
+`;
diff --git a/tests/format/misc/errors/js/export-name/format.test.js b/tests/format/misc/errors/js/export-name/format.test.js
new file mode 100644
index 000000000..23e2554a5
--- /dev/null
+++ b/tests/format/misc/errors/js/export-name/format.test.js
@@ -0,0 +1,26 @@
+runFormatTest(
+  {
+    importMeta: import.meta,
+    snippets: [
+      String.raw`import { "\uD83C" as b } from "./foo";`,
+      String.raw`export { "\uD83C" } from "./foo";`,
+      String.raw`export { "\uD83C" as b } from "./foo";`,
+      String.raw`export { b as "\uD83C" } from "./foo";`,
+    ],
+  },
+  [
+    "babel",
+    "babel-flow",
+    "babel-ts",
+    "__babel_estree",
+    // "typescript",
+    "flow",
+    "meriyah",
+    "acorn",
+    "espree",
+    "espree",
+    "hermes",
+    "oxc",
+    "oxc-ts",
+  ],
+);
diff --git a/tests/unit/syntax-transform.js b/tests/unit/syntax-transform.js
index 7ac716674..91324c077 100644
--- a/tests/unit/syntax-transform.js
+++ b/tests/unit/syntax-transform.js
@@ -15,6 +15,7 @@ const publicDocPath = url.fileURLToPath(
 const transform = (code) =>
   "\n" +
   transformCode(code, file, {
+    __isSyntaxTransformUnitTest: true,
     reuseDocModule: true,
   })
     .replaceAll(
@@ -173,6 +174,28 @@ test("String.raw", () => {
   `);
 });
 
+test("String#isWellFormed", () => {
+  expect(transform("foo.isWellFormed()")).toMatchInlineSnapshot(`
+    "
+    import __isWellFormed from "<SHIMS>/method-is-well-formed.js";
+
+    __isWellFormed(/* OPTIONAL_OBJECT: false */0, foo);
+    "
+  `);
+  expect(transform("foo?.isWellFormed()")).toMatchInlineSnapshot(`
+    "
+    import __isWellFormed from "<SHIMS>/method-is-well-formed.js";
+
+    __isWellFormed(/* OPTIONAL_OBJECT: true */1, foo);
+    "
+  `);
+  expect(transform("foo?.isWellFormed(extraArgument)")).toMatchInlineSnapshot(`
+    "
+    foo?.isWellFormed(extraArgument)
+    "
+  `);
+});
+
 test("public doc functionality", () => {
   expect(transform('import {align, line} from "./document/index.js"'))
     .toMatchInlineSnapshot(`
@@ -233,6 +256,7 @@ test("All", () => {
           b = bar?.findLast(() => true),
           c = foo.findLastIndex(callback)
       const d = [a, b, foo].toReversed().join(String.raw\`\${d}\`)
+      const r = a.isWellFormed()
       }
     `),
   ).toMatchInlineSnapshot(`
@@ -242,6 +266,7 @@ test("All", () => {
     import __findLast from "<SHIMS>/method-find-last.js";
     import __findLastIndex from "<SHIMS>/method-find-last-index.js";
     import __toReversed from "<SHIMS>/method-to-reversed.js";
+    import __isWellFormed from "<SHIMS>/method-is-well-formed.js";
 
     import { builders as __doc_builders } from "<PUBLIC_DOC_PATH>";
     const {
@@ -253,6 +278,7 @@ test("All", () => {
         b = __findLast(/* OPTIONAL_OBJECT: true */1, bar, () => true),
         c = __findLastIndex(/* OPTIONAL_OBJECT: false */0, foo, callback);
       const d = __toReversed(/* OPTIONAL_OBJECT: false */0, [a, b, foo]).join(\`\${d}\`);
+      const r = __isWellFormed(/* OPTIONAL_OBJECT: false */0, a);
     }
     "
   `);
diff --git a/yarn.lock b/yarn.lock
index 1519ad345..652c52f2d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6638,10 +6638,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"meriyah@npm:6.1.4":
-  version: 6.1.4
-  resolution: "meriyah@npm:6.1.4"
-  checksum: 10/16b841b9bf7cd6a815864f7054958207cacaa61a4a879477da38210132d30449d83accad822919c4c6f26697e113c9f6ced3620b4c5a1703c315ee183fe0bfc0
+"meriyah@npm:7.0.0":
+  version: 7.0.0
+  resolution: "meriyah@npm:7.0.0"
+  checksum: 10/fa880d8dab039d9ba4ad4dbc2b6707d0088016fe492fee6e136ec1f157ee001fdaa9c9f1b43a4bbf4fcdce57fa97584d828811c1d436868f57ff072207f6bf10
   languageName: node
   linkType: hard
 
@@ -7568,7 +7568,7 @@ __metadata:
     linguist-languages: "npm:9.1.0"
     magic-string: "npm:0.30.21"
     make-synchronized: "npm:0.8.0"
-    meriyah: "npm:6.1.4"
+    meriyah: "npm:7.0.0"
     micromatch: "npm:4.0.8"
     minimist: "npm:1.2.8"
     n-readlines: "npm:1.0.1"