diff --git a/changelog_unreleased/javascript/18611.md b/changelog_unreleased/javascript/18611.md
new file mode 100644
index 000000000..b36912ace
--- /dev/null
+++ b/changelog_unreleased/javascript/18611.md
@@ -0,0 +1,23 @@
+#### Drop support for the old "import assertions" syntax (#18611 by @fisker)
+
+`import assertions` (using the `assert` keyword) is an old version of the current [import attributes proposal](https://github.com/tc39/proposal-import-attributes).
+
+```js
+// Old (deprecated)
+import foo from "./foo.json" assert { type: "json" };
+
+// Current standard
+import foo from "./foo.json" with { type: "json" };
+```
+
+Babel 8 completely removed support for the legacy `assert` syntax (the old parser plugin is gone).
+Without Babel parser support, Prettier can no longer reliably parse or format code using `import ... assert { ... }`.
+
+Please migrate to the `with` syntax.
+
+```diff
+- import foo from "./foo.json" assert { type: "json" };
++ import foo from "./foo.json" with   { type: "json" };
+```
+
+See also Prettier's [disclaimer about non-standard syntax](https://prettier.io/docs/rationale.html#disclaimer-about-non-standard-syntax).
diff --git a/package.json b/package.json
index cdf627be6..caafc79d0 100644
--- a/package.json
+++ b/package.json
@@ -43,9 +43,9 @@
   ],
   "dependencies": {
     "@angular/compiler": "21.1.0",
-    "@babel/code-frame": "8.0.0-beta.3",
-    "@babel/parser": "8.0.0-beta.3",
-    "@babel/types": "8.0.0-beta.3",
+    "@babel/code-frame": "8.0.0-beta.4",
+    "@babel/parser": "8.0.0-beta.4",
+    "@babel/types": "8.0.0-beta.4",
     "@glimmer/syntax": "0.95.0",
     "@prettier/cli": "0.10.0",
     "@prettier/html-event-attributes": "0.0.1",
@@ -135,7 +135,7 @@
     "yaml-unist-parser": "2.2.1"
   },
   "devDependencies": {
-    "@babel/generator": "8.0.0-beta.3",
+    "@babel/generator": "8.0.0-beta.4",
     "@eslint/js": "9.39.2",
     "@stylistic/eslint-plugin": "5.6.1",
     "@types/jsesc": "3.0.3",
diff --git a/scripts/nodejs-14-test-loader.js b/scripts/nodejs-14-test-loader.js
index b3cb380e0..d577b6d16 100644
--- a/scripts/nodejs-14-test-loader.js
+++ b/scripts/nodejs-14-test-loader.js
@@ -8,19 +8,29 @@ import esbuild from "esbuild";
 // We can use an `--experimental-loader` to compile them on-the-fly with esbuild.
 
 export async function getSource(url, context, defaultGetSource) {
-  if (
-    !/node_modules\/@babel\/(?:code-frame|highlight)/.test(url) ||
-    context.format !== "module"
-  ) {
-    return defaultGetSource(url, context, defaultGetSource);
+  if (context.format === "module") {
+    if (url.includes("/node_modules/js-tokens/")) {
+      const text = await readFile(fileURLToPath(url), "utf8");
+      const commonJsExport = 'export { jsTokens as "module.exports" };';
+      if (text.includes(commonJsExport)) {
+        return { source: text.replace(commonJsExport, "") };
+      }
+    }
+
+    if (
+      url.includes("/node_modules/@babel/code-frame/") ||
+      url.includes("/node_modules/@babel/highlight/")
+    ) {
+      const raw = await readFile(fileURLToPath(url));
+      try {
+        const result = await esbuild.transform(raw, { target: "node14" });
+        return { source: result.code };
+      } catch (error) {
+        error.message += ` (in ${url})`;
+        throw error;
+      }
+    }
   }
 
-  const raw = await readFile(fileURLToPath(url));
-  try {
-    const result = await esbuild.transform(raw, { target: "node14" });
-    return { source: result.code };
-  } catch (error) {
-    error.message += ` (in ${url})`;
-    throw error;
-  }
+  return defaultGetSource(url, context, defaultGetSource);
 }
diff --git a/src/language-js/parse/babel.js b/src/language-js/parse/babel.js
index 5693ce601..7e6c7cd43 100644
--- a/src/language-js/parse/babel.js
+++ b/src/language-js/parse/babel.js
@@ -212,15 +212,6 @@ const allowedReasonCodes = new Set([
   "InvalidPrivateFieldResolution",
   "DuplicateExport",
 
-  /*
-  Legacy syntax
-
-  ```js
-  import json from "./json.json" assert {type: "json"};
-  ```
-  */
-  "ImportAttributesUseAssert",
-
   /*
   Allow const without initializer in `.d.ts` files
   https://github.com/prettier/prettier/issues/17649
diff --git a/src/language-js/parse/postprocess/index.js b/src/language-js/parse/postprocess/index.js
index 03191e92c..08fa714b9 100644
--- a/src/language-js/parse/postprocess/index.js
+++ b/src/language-js/parse/postprocess/index.js
@@ -151,7 +151,9 @@ function postprocess(ast, options) {
         // For hack-style pipeline
         case "TopicReference":
           ast.extra = { ...ast.extra, __isUsingHackPipeline: true };
-          break; // In Flow parser, it doesn't generate union/intersection types for single type
+          break;
+
+        // In Flow parser, it doesn't generate union/intersection types for single type
         case "TSUnionType":
         case "TSIntersectionType":
           if (node.types.length === 1) {
@@ -159,10 +161,9 @@ function postprocess(ast, options) {
           }
           break;
 
-        // https://github.com/facebook/hermes/issues/1712
-        case "ImportExpression":
-          if (parser === "hermes" && node.attributes && !node.options) {
-            node.options = node.attributes;
+        case "ImportDeclaration":
+          if (parser === "hermes" && node.assertions && !node.attributes) {
+            node.attributes = node.assertions;
           }
           break;
 
@@ -183,15 +184,6 @@ function postprocess(ast, options) {
             return rebalanceLogicalTree(node);
           }
           break;
-
-        // https://github.com/babel/babel/issues/17506
-        // It's possible to have parenthesized `argument`, need do this in `onLeave`
-        case "TSImportType":
-          if (!node.source && node.argument.type === "TSLiteralType") {
-            node.source = node.argument.literal;
-            delete node.argument;
-          }
-          break;
       }
 
       /* c8 ignore next 3 */
diff --git a/src/language-js/print/module.js b/src/language-js/print/module.js
index 648b9c3bb..41da353cf 100644
--- a/src/language-js/print/module.js
+++ b/src/language-js/print/module.js
@@ -254,11 +254,6 @@ function shouldPrintSpecifiers(node, options) {
 }
 
 function getImportAttributesKeyword(node, options) {
-  // Babel parser add this property to indicate the keyword is `assert`
-  if (node.extra?.deprecatedAssertSyntax) {
-    return "assert";
-  }
-
   const textBetweenSourceAndAttributes = getTextWithoutComments(
     options,
     locEnd(node.source),
diff --git a/src/language-js/traverse/visitor-keys.evaluate.js b/src/language-js/traverse/visitor-keys.evaluate.js
index 9869179e9..50f079c80 100644
--- a/src/language-js/traverse/visitor-keys.evaluate.js
+++ b/src/language-js/traverse/visitor-keys.evaluate.js
@@ -38,16 +38,9 @@ const excludeVisitorKeys = {
 
   // Flow node from Babel
   TupleTypeAnnotation: ["types"],
-
-  // https://github.com/babel/babel/issues/17506
-  TSImportType: ["argument"],
 };
 
-// https://github.com/babel/babel/issues/17524
 const excludeNodeTypes = [
-  // Babel will remove in v8
-  // https://github.com/babel/babel/pull/17242
-  "TupleExpression",
   // Babel, Won't exist since we use `createImportExpressions` when parsing with babel
   "Import",
 
diff --git a/tests/config/utilities/check-parsers.js b/tests/config/utilities/check-parsers.js
index 7673cd70f..3a8dbb27c 100644
--- a/tests/config/utilities/check-parsers.js
+++ b/tests/config/utilities/check-parsers.js
@@ -57,7 +57,7 @@ const categoryParsers = new Map([
   [
     "js",
     {
-      parsers: ["babel", "acorn", "espree", "meriyah", "oxc", "oxc-ts"],
+      parsers: ["babel", "acorn", "espree", "meriyah", "oxc"],
       verifyParsers: [
         "babel",
         "acorn",
@@ -69,6 +69,7 @@ const categoryParsers = new Map([
         "babel-flow",
         "typescript",
         "babel-ts",
+        "hermes",
       ],
       extensions: [".js", ".cjs", ".mjs"],
     },
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 fb1323814..547da233a 100644
--- a/tests/format/js/babel-plugins/__snapshots__/format.test.js.snap
+++ b/tests/format/js/babel-plugins/__snapshots__/format.test.js.snap
@@ -1247,44 +1247,6 @@ import("./foo.json", { assert: { type: "json" } });
 ================================================================================
 `;
 
-exports[`import-assertions-static.js [acorn] format 1`] = `
-"Unexpected token (1:31)
-> 1 | import json from "./foo.json" assert { type: "json" };
-    |                               ^
-  2 |
-Cause: Unexpected token (1:30)"
-`;
-
-exports[`import-assertions-static.js [espree] format 1`] = `
-"Unexpected token assert (1:31)
-> 1 | import json from "./foo.json" assert { type: "json" };
-    |                               ^
-  2 |
-Cause: Unexpected token assert"
-`;
-
-exports[`import-assertions-static.js [meriyah] format 1`] = `
-"Unexpected token: 'identifier' (1:31)
-> 1 | import json from "./foo.json" assert { type: "json" };
-    |                               ^^^^^^
-  2 |
-Cause: [1:30-1:36]: Unexpected token: 'identifier'"
-`;
-
-exports[`import-assertions-static.js format 1`] = `
-====================================options=====================================
-parsers: ["babel", "babel-ts", "babel-flow"]
-printWidth: 80
-                                                                                | printWidth
-=====================================input======================================
-import json from "./foo.json" assert { type: "json" };
-
-=====================================output=====================================
-import json from "./foo.json" assert { type: "json" };
-
-================================================================================
-`;
-
 exports[`import-attributes-dynamic.js format 1`] = `
 ====================================options=====================================
 parsers: ["babel", "babel-ts", "babel-flow"]
diff --git a/tests/format/js/babel-plugins/format.test.js b/tests/format/js/babel-plugins/format.test.js
index 438e34a0b..15206ad89 100644
--- a/tests/format/js/babel-plugins/format.test.js
+++ b/tests/format/js/babel-plugins/format.test.js
@@ -11,7 +11,6 @@ runFormatTest(import.meta, ["babel", "babel-ts", "babel-flow"], {
       "flow.js",
       "function-bind.js",
       "function-sent.js",
-      "import-assertions-static.js",
       "partial-application.js",
       "pipeline-operator-fsharp.js",
       "pipeline-operator-minimal.js",
@@ -35,7 +34,6 @@ runFormatTest(import.meta, ["babel", "babel-ts", "babel-flow"], {
       "flow.js",
       "function-bind.js",
       "function-sent.js",
-      "import-assertions-static.js",
       "partial-application.js",
       "pipeline-operator-fsharp.js",
       "pipeline-operator-minimal.js",
@@ -67,7 +65,6 @@ runFormatTest(import.meta, ["babel", "babel-ts", "babel-flow"], {
       "throw-expressions.js",
       "typescript.js",
       "v8intrinsic.js",
-      "import-assertions-static.js",
       "module-blocks.js",
       "async-do-expressions.js",
       "explicit-resource-management.js",
diff --git a/tests/format/js/babel-plugins/import-assertions-static.js b/tests/format/js/babel-plugins/import-assertions-static.js
deleted file mode 100644
index 890e42900..000000000
--- a/tests/format/js/babel-plugins/import-assertions-static.js
+++ /dev/null
@@ -1 +0,0 @@
-import json from "./foo.json" assert { type: "json" };
diff --git a/tests/format/js/import-assertions/__snapshots__/format.test.js.snap b/tests/format/js/import-assertions/__snapshots__/format.test.js.snap
index 3e1ad8cc6..a84bb05e3 100644
--- a/tests/format/js/import-assertions/__snapshots__/format.test.js.snap
+++ b/tests/format/js/import-assertions/__snapshots__/format.test.js.snap
@@ -2,7 +2,7 @@
 
 exports[`dynamic-import.js format 1`] = `
 ====================================options=====================================
-parsers: ["babel", "typescript"]
+parsers: ["oxc", "typescript", "hermes"]
 printWidth: 80
                                                                                 | printWidth
 =====================================input======================================
@@ -14,42 +14,33 @@ import("./foo.json", { assert: { type: "json" } });
 ================================================================================
 `;
 
-exports[`empty.js [acorn] format 1`] = `
-"Unexpected token (2:33)
+exports[`empty.js [babel-ts] format 1`] = `
+"Missing semicolon. (2:32)
   1 | export * as foo from "foo.json"
 > 2 | export * as bar from "bar.json" assert { }
-    |                                 ^
+    |                                ^
   3 | export * as baz from "baz.json" assert { /* comment */ }
   4 |
   5 | import * as foo from "foo.json"
-Cause: Unexpected token (2:32)"
+Cause: Missing semicolon. (2:31)"
 `;
 
-exports[`empty.js [espree] format 1`] = `
-"Unexpected token assert (2:33)
+exports[`empty.js [hermes] format 1`] = `
+"';' expected (2:32)
   1 | export * as foo from "foo.json"
 > 2 | export * as bar from "bar.json" assert { }
-    |                                 ^
+    |                                ^
   3 | export * as baz from "baz.json" assert { /* comment */ }
   4 |
   5 | import * as foo from "foo.json"
-Cause: Unexpected token assert"
-`;
-
-exports[`empty.js [meriyah] format 1`] = `
-"Unexpected token: 'identifier' (2:33)
-  1 | export * as foo from "foo.json"
-> 2 | export * as bar from "bar.json" assert { }
-    |                                 ^^^^^^
-  3 | export * as baz from "baz.json" assert { /* comment */ }
-  4 |
-  5 | import * as foo from "foo.json"
-Cause: [2:32-2:38]: Unexpected token: 'identifier'"
+Cause: ';' expected (2:32)
+export * as bar from "bar.json" assert { }
+                                ^"
 `;
 
 exports[`empty.js format 1`] = `
 ====================================options=====================================
-parsers: ["babel", "typescript"]
+parsers: ["oxc", "typescript", "hermes"]
 printWidth: 80
                                                                                 | printWidth
 =====================================input======================================
@@ -72,39 +63,33 @@ import * as baz from "baz.json" /* comment */ assert {};
 ================================================================================
 `;
 
-exports[`keyword-detect.js [acorn] format 1`] = `
-"Unexpected token (1:33)
+exports[`keyword-detect.js [babel-ts] format 1`] = `
+"Missing semicolon. (1:21)
 > 1 | import "./test.json" /* with */ assert /* with */  { type: "json" }
-    |                                 ^
+    |                     ^
   2 | import {default as b} from "./test.json" /* with */ assert /* with */  { type: "json" }
   3 |
   4 | export {default as e} from "./test.json" /* with */ assert /* with */  { type: "json" }
-Cause: Unexpected token (1:32)"
+Cause: Missing semicolon. (1:20)"
 `;
 
-exports[`keyword-detect.js [espree] format 1`] = `
-"Unexpected token assert (1:33)
-> 1 | import "./test.json" /* with */ assert /* with */  { type: "json" }
-    |                                 ^
+exports[`keyword-detect.js [hermes] format 1`] = `
+"';' expected (4:52)
   2 | import {default as b} from "./test.json" /* with */ assert /* with */  { type: "json" }
   3 |
-  4 | export {default as e} from "./test.json" /* with */ assert /* with */  { type: "json" }
-Cause: Unexpected token assert"
-`;
-
-exports[`keyword-detect.js [meriyah] format 1`] = `
-"Unexpected token: 'identifier' (1:33)
-> 1 | import "./test.json" /* with */ assert /* with */  { type: "json" }
-    |                                 ^^^^^^
-  2 | import {default as b} from "./test.json" /* with */ assert /* with */  { type: "json" }
-  3 |
-  4 | export {default as e} from "./test.json" /* with */ assert /* with */  { type: "json" }
-Cause: [1:32-1:38]: Unexpected token: 'identifier'"
+> 4 | export {default as e} from "./test.json" /* with */ assert /* with */  { type: "json" }
+    |                                                    ^
+  5 |
+  6 | export * from "./test.json" /* with */ assert /* with */  { type: "json" }
+  7 |
+Cause: ';' expected (4:52)
+export {default as e} from "./test.json" /* with */ assert /* with */  { type: "json" }
+                                                    ^"
 `;
 
 exports[`keyword-detect.js format 1`] = `
 ====================================options=====================================
-parsers: ["babel", "typescript"]
+parsers: ["oxc", "typescript", "hermes"]
 printWidth: 80
                                                                                 | printWidth
 =====================================input======================================
@@ -126,33 +111,17 @@ export * from "./test.json" /* with */ /* with */ assert { type: "json" };
 ================================================================================
 `;
 
-exports[`multi-types.js [acorn] format 1`] = `
-"Unexpected token (1:31)
+exports[`multi-types.js [babel-ts] format 1`] = `
+"Unexpected token (1:58)
 > 1 | import json from "./foo.json" assert { type: "json", type: "bar" };
-    |                               ^
+    |                                                          ^
   2 |
-Cause: Unexpected token (1:30)"
-`;
-
-exports[`multi-types.js [espree] format 1`] = `
-"Unexpected token assert (1:31)
-> 1 | import json from "./foo.json" assert { type: "json", type: "bar" };
-    |                               ^
-  2 |
-Cause: Unexpected token assert"
-`;
-
-exports[`multi-types.js [meriyah] format 1`] = `
-"Unexpected token: 'identifier' (1:31)
-> 1 | import json from "./foo.json" assert { type: "json", type: "bar" };
-    |                               ^^^^^^
-  2 |
-Cause: [1:30-1:36]: Unexpected token: 'identifier'"
+Cause: Unexpected token (1:57)"
 `;
 
 exports[`multi-types.js format 1`] = `
 ====================================options=====================================
-parsers: ["babel", "typescript"]
+parsers: ["oxc", "typescript", "hermes"]
 printWidth: 80
                                                                                 | printWidth
 =====================================input======================================
@@ -164,33 +133,17 @@ import json from "./foo.json" assert { type: "json", type: "bar" };
 ================================================================================
 `;
 
-exports[`non-type.js [acorn] format 1`] = `
-"Unexpected token (1:28)
+exports[`non-type.js [babel-ts] format 1`] = `
+"Missing semicolon. (1:27)
 > 1 | import foo from "foo.json" assert { lazy: "true" };
-    |                            ^
+    |                           ^
   2 |
-Cause: Unexpected token (1:27)"
-`;
-
-exports[`non-type.js [espree] format 1`] = `
-"Unexpected token assert (1:28)
-> 1 | import foo from "foo.json" assert { lazy: "true" };
-    |                            ^
-  2 |
-Cause: Unexpected token assert"
-`;
-
-exports[`non-type.js [meriyah] format 1`] = `
-"Unexpected token: 'identifier' (1:28)
-> 1 | import foo from "foo.json" assert { lazy: "true" };
-    |                            ^^^^^^
-  2 |
-Cause: [1:27-1:33]: Unexpected token: 'identifier'"
+Cause: Missing semicolon. (1:26)"
 `;
 
 exports[`non-type.js format 1`] = `
 ====================================options=====================================
-parsers: ["babel", "typescript"]
+parsers: ["oxc", "typescript", "hermes"]
 printWidth: 80
                                                                                 | printWidth
 =====================================input======================================
@@ -204,7 +157,7 @@ import foo from "foo.json" assert { lazy: "true" };
 
 exports[`not-import-assertions.js format 1`] = `
 ====================================options=====================================
-parsers: ["babel", "typescript"]
+parsers: ["oxc", "typescript", "hermes"]
 printWidth: 80
                                                                                 | printWidth
 =====================================input======================================
@@ -218,39 +171,31 @@ assert({ type: "json" });
 ================================================================================
 `;
 
-exports[`re-export.js [acorn] format 1`] = `
-"Unexpected token (1:44)
+exports[`re-export.js [babel-ts] format 1`] = `
+"Missing semicolon. (1:43)
 > 1 | export { default as foo2 } from "foo.json" assert { type: "json" };
-    |                                            ^
+    |                                           ^
   2 | export * from "foo.json" assert { type: "json" };
   3 | export * as foo3 from "foo.json" assert { type: "json" };
   4 |
-Cause: Unexpected token (1:43)"
+Cause: Missing semicolon. (1:42)"
 `;
 
-exports[`re-export.js [espree] format 1`] = `
-"Unexpected token assert (1:44)
+exports[`re-export.js [hermes] format 1`] = `
+"';' expected (1:43)
 > 1 | export { default as foo2 } from "foo.json" assert { type: "json" };
-    |                                            ^
+    |                                           ^
   2 | export * from "foo.json" assert { type: "json" };
   3 | export * as foo3 from "foo.json" assert { type: "json" };
   4 |
-Cause: Unexpected token assert"
-`;
-
-exports[`re-export.js [meriyah] format 1`] = `
-"Unexpected token: 'identifier' (1:44)
-> 1 | export { default as foo2 } from "foo.json" assert { type: "json" };
-    |                                            ^^^^^^
-  2 | export * from "foo.json" assert { type: "json" };
-  3 | export * as foo3 from "foo.json" assert { type: "json" };
-  4 |
-Cause: [1:43-1:49]: Unexpected token: 'identifier'"
+Cause: ';' expected (1:43)
+export { default as foo2 } from "foo.json" assert { type: "json" };
+                                           ^"
 `;
 
 exports[`re-export.js format 1`] = `
 ====================================options=====================================
-parsers: ["babel", "typescript"]
+parsers: ["oxc", "typescript", "hermes"]
 printWidth: 80
                                                                                 | printWidth
 =====================================input======================================
@@ -266,33 +211,17 @@ export * as foo3 from "foo.json" assert { type: "json" };
 ================================================================================
 `;
 
-exports[`static-import.js [acorn] format 1`] = `
-"Unexpected token (1:31)
+exports[`static-import.js [babel-ts] format 1`] = `
+"Missing semicolon. (1:30)
 > 1 | import json from "./foo.json" assert { type: "json" };
-    |                               ^
+    |                              ^
   2 |
-Cause: Unexpected token (1:30)"
-`;
-
-exports[`static-import.js [espree] format 1`] = `
-"Unexpected token assert (1:31)
-> 1 | import json from "./foo.json" assert { type: "json" };
-    |                               ^
-  2 |
-Cause: Unexpected token assert"
-`;
-
-exports[`static-import.js [meriyah] format 1`] = `
-"Unexpected token: 'identifier' (1:31)
-> 1 | import json from "./foo.json" assert { type: "json" };
-    |                               ^^^^^^
-  2 |
-Cause: [1:30-1:36]: Unexpected token: 'identifier'"
+Cause: Missing semicolon. (1:29)"
 `;
 
 exports[`static-import.js format 1`] = `
 ====================================options=====================================
-parsers: ["babel", "typescript"]
+parsers: ["oxc", "typescript", "hermes"]
 printWidth: 80
                                                                                 | printWidth
 =====================================input======================================
@@ -304,33 +233,17 @@ import json from "./foo.json" assert { type: "json" };
 ================================================================================
 `;
 
-exports[`without-from.js [acorn] format 1`] = `
-"Unexpected token (1:14)
+exports[`without-from.js [babel-ts] format 1`] = `
+"Missing semicolon. (1:13)
 > 1 | import "foo" assert { type: "json" }
-    |              ^
+    |             ^
   2 |
-Cause: Unexpected token (1:13)"
-`;
-
-exports[`without-from.js [espree] format 1`] = `
-"Unexpected token assert (1:14)
-> 1 | import "foo" assert { type: "json" }
-    |              ^
-  2 |
-Cause: Unexpected token assert"
-`;
-
-exports[`without-from.js [meriyah] format 1`] = `
-"Unexpected token: 'identifier' (1:14)
-> 1 | import "foo" assert { type: "json" }
-    |              ^^^^^^
-  2 |
-Cause: [1:13-1:19]: Unexpected token: 'identifier'"
+Cause: Missing semicolon. (1:12)"
 `;
 
 exports[`without-from.js format 1`] = `
 ====================================options=====================================
-parsers: ["babel", "typescript"]
+parsers: ["oxc", "typescript", "hermes"]
 printWidth: 80
                                                                                 | printWidth
 =====================================input======================================
diff --git a/tests/format/js/import-assertions/bracket-spacing/__snapshots__/format.test.js.snap b/tests/format/js/import-assertions/bracket-spacing/__snapshots__/format.test.js.snap
index 50a8d2f20..4859d0cc9 100644
--- a/tests/format/js/import-assertions/bracket-spacing/__snapshots__/format.test.js.snap
+++ b/tests/format/js/import-assertions/bracket-spacing/__snapshots__/format.test.js.snap
@@ -3,7 +3,7 @@
 exports[`dynamic-import.js - {"bracketSpacing":false} format 1`] = `
 ====================================options=====================================
 bracketSpacing: false
-parsers: ["babel"]
+parsers: ["oxc", "typescript", "hermes"]
 printWidth: 80
                                                                                 | printWidth
 =====================================input======================================
@@ -15,31 +15,26 @@ import("./foo.json", {assert: {type: "json"}});
 ================================================================================
 `;
 
-exports[`empty.js - {"bracketSpacing":false} [acorn] format 1`] = `
-"Unexpected token (1:33)
+exports[`empty.js - {"bracketSpacing":false} [babel-ts] format 1`] = `
+"Missing semicolon. (1:32)
 > 1 | export * as bar from "bar.json" assert { }
-    |                                 ^
-Cause: Unexpected token (1:32)"
+    |                                ^
+Cause: Missing semicolon. (1:31)"
 `;
 
-exports[`empty.js - {"bracketSpacing":false} [espree] format 1`] = `
-"Unexpected token assert (1:33)
+exports[`empty.js - {"bracketSpacing":false} [hermes] format 1`] = `
+"';' expected (1:32)
 > 1 | export * as bar from "bar.json" assert { }
-    |                                 ^
-Cause: Unexpected token assert"
-`;
-
-exports[`empty.js - {"bracketSpacing":false} [meriyah] format 1`] = `
-"Unexpected token: 'identifier' (1:33)
-> 1 | export * as bar from "bar.json" assert { }
-    |                                 ^^^^^^
-Cause: [1:32-1:38]: Unexpected token: 'identifier'"
+    |                                ^
+Cause: ';' expected (1:32)
+export * as bar from "bar.json" assert { }
+                                ^"
 `;
 
 exports[`empty.js - {"bracketSpacing":false} format 1`] = `
 ====================================options=====================================
 bracketSpacing: false
-parsers: ["babel"]
+parsers: ["oxc", "typescript", "hermes"]
 printWidth: 80
                                                                                 | printWidth
 =====================================input======================================
@@ -50,34 +45,28 @@ export * as bar from "bar.json" assert {};
 ================================================================================
 `;
 
-exports[`re-export.js - {"bracketSpacing":false} [acorn] format 1`] = `
-"Unexpected token (1:44)
+exports[`re-export.js - {"bracketSpacing":false} [babel-ts] format 1`] = `
+"Missing semicolon. (1:43)
 > 1 | export { default as foo2 } from "foo.json" assert { type: "json" };
-    |                                            ^
+    |                                           ^
   2 |
-Cause: Unexpected token (1:43)"
+Cause: Missing semicolon. (1:42)"
 `;
 
-exports[`re-export.js - {"bracketSpacing":false} [espree] format 1`] = `
-"Unexpected token assert (1:44)
+exports[`re-export.js - {"bracketSpacing":false} [hermes] format 1`] = `
+"';' expected (1:43)
 > 1 | export { default as foo2 } from "foo.json" assert { type: "json" };
-    |                                            ^
+    |                                           ^
   2 |
-Cause: Unexpected token assert"
-`;
-
-exports[`re-export.js - {"bracketSpacing":false} [meriyah] format 1`] = `
-"Unexpected token: 'identifier' (1:44)
-> 1 | export { default as foo2 } from "foo.json" assert { type: "json" };
-    |                                            ^^^^^^
-  2 |
-Cause: [1:43-1:49]: Unexpected token: 'identifier'"
+Cause: ';' expected (1:43)
+export { default as foo2 } from "foo.json" assert { type: "json" };
+                                           ^"
 `;
 
 exports[`re-export.js - {"bracketSpacing":false} format 1`] = `
 ====================================options=====================================
 bracketSpacing: false
-parsers: ["babel"]
+parsers: ["oxc", "typescript", "hermes"]
 printWidth: 80
                                                                                 | printWidth
 =====================================input======================================
@@ -89,34 +78,18 @@ export {default as foo2} from "foo.json" assert {type: "json"};
 ================================================================================
 `;
 
-exports[`static-import.js - {"bracketSpacing":false} [acorn] format 1`] = `
-"Unexpected token (1:31)
+exports[`static-import.js - {"bracketSpacing":false} [babel-ts] format 1`] = `
+"Missing semicolon. (1:30)
 > 1 | import json from "./foo.json" assert { type: "json" };
-    |                               ^
+    |                              ^
   2 |
-Cause: Unexpected token (1:30)"
-`;
-
-exports[`static-import.js - {"bracketSpacing":false} [espree] format 1`] = `
-"Unexpected token assert (1:31)
-> 1 | import json from "./foo.json" assert { type: "json" };
-    |                               ^
-  2 |
-Cause: Unexpected token assert"
-`;
-
-exports[`static-import.js - {"bracketSpacing":false} [meriyah] format 1`] = `
-"Unexpected token: 'identifier' (1:31)
-> 1 | import json from "./foo.json" assert { type: "json" };
-    |                               ^^^^^^
-  2 |
-Cause: [1:30-1:36]: Unexpected token: 'identifier'"
+Cause: Missing semicolon. (1:29)"
 `;
 
 exports[`static-import.js - {"bracketSpacing":false} format 1`] = `
 ====================================options=====================================
 bracketSpacing: false
-parsers: ["babel"]
+parsers: ["oxc", "typescript", "hermes"]
 printWidth: 80
                                                                                 | printWidth
 =====================================input======================================
diff --git a/tests/format/js/import-assertions/bracket-spacing/format.test.js b/tests/format/js/import-assertions/bracket-spacing/format.test.js
index 22128e084..38e1da333 100644
--- a/tests/format/js/import-assertions/bracket-spacing/format.test.js
+++ b/tests/format/js/import-assertions/bracket-spacing/format.test.js
@@ -1,8 +1,7 @@
-runFormatTest(import.meta, ["babel"], {
+runFormatTest(import.meta, ["oxc", "typescript", "hermes"], {
   bracketSpacing: false,
   errors: {
-    acorn: ["static-import.js", "re-export.js", "empty.js"],
-    espree: ["static-import.js", "re-export.js", "empty.js"],
-    meriyah: ["static-import.js", "re-export.js", "empty.js"],
+    "babel-ts": ["static-import.js", "re-export.js", "empty.js"],
+    hermes: ["empty.js", "re-export.js"],
   },
 });
diff --git a/tests/format/js/import-assertions/format.test.js b/tests/format/js/import-assertions/format.test.js
index 65202051a..2cf6fe4bc 100644
--- a/tests/format/js/import-assertions/format.test.js
+++ b/tests/format/js/import-assertions/format.test.js
@@ -1,24 +1,6 @@
-runFormatTest(import.meta, ["babel", "typescript"], {
+runFormatTest(import.meta, ["oxc", "typescript", "hermes"], {
   errors: {
-    acorn: [
-      "empty.js",
-      "multi-types.js",
-      "static-import.js",
-      "re-export.js",
-      "without-from.js",
-      "non-type.js",
-      "keyword-detect.js",
-    ],
-    espree: [
-      "empty.js",
-      "multi-types.js",
-      "static-import.js",
-      "re-export.js",
-      "without-from.js",
-      "non-type.js",
-      "keyword-detect.js",
-    ],
-    meriyah: [
+    "babel-ts": [
       "empty.js",
       "multi-types.js",
       "static-import.js",
@@ -27,5 +9,6 @@ runFormatTest(import.meta, ["babel", "typescript"], {
       "non-type.js",
       "keyword-detect.js",
     ],
+    hermes: ["keyword-detect.js", "empty.js", "re-export.js"],
   },
 });
diff --git a/tests/format/misc/errors/js/__snapshots__/format.test.js.snap b/tests/format/misc/errors/js/__snapshots__/format.test.js.snap
index ac62dacba..e76caa372 100644
--- a/tests/format/misc/errors/js/__snapshots__/format.test.js.snap
+++ b/tests/format/misc/errors/js/__snapshots__/format.test.js.snap
@@ -12,22 +12,6 @@ exports[`html-like-comments.js [babel] format 1`] = `
 Cause: Unexpected token (3:0)"
 `;
 
-exports[`import-assertions-for-export-without-from.js [babel] format 1`] = `
-"Missing semicolon. (1:26)
-> 1 | export { default as foo } assert { type: "json" };
-    |                          ^
-  2 |
-Cause: Missing semicolon. (1:25)"
-`;
-
-exports[`import-assertions-with-parens.js [babel] format 1`] = `
-"Unexpected token, expected "{" (1:19)
-> 1 | import "x" assert ({type: 'json'});
-    |                   ^
-  2 |
-Cause: Unexpected token, expected "{" (1:18)"
-`;
-
 exports[`import-attributes-for-export-without-from.js [babel] format 1`] = `
 "Unexpected token, expected "(" (1:32)
 > 1 | export { default as foo } with { type: "json" };
@@ -166,24 +150,24 @@ Cause: Unexpected token (1:1)"
 `;
 
 exports[`snippet: #10 [babel] format 1`] = `
-"Invalid decimal. (1:1)
+"Identifier directly after number. (1:12)
 > 1 | 0b101011101m;
-    | ^
-Cause: Invalid decimal. (1:0)"
+    |            ^
+Cause: Identifier directly after number. (1:11)"
 `;
 
 exports[`snippet: #11 [babel] format 1`] = `
-"Invalid decimal. (1:1)
+"Identifier directly after number. (1:8)
 > 1 | 0x16432m;
-    | ^
-Cause: Invalid decimal. (1:0)"
+    |        ^
+Cause: Identifier directly after number. (1:7)"
 `;
 
 exports[`snippet: #12 [babel] format 1`] = `
-"Invalid decimal. (1:1)
+"Identifier directly after number. (1:8)
 > 1 | 0o16432m;
-    | ^
-Cause: Invalid decimal. (1:0)"
+    |        ^
+Cause: Identifier directly after number. (1:7)"
 `;
 
 exports[`static-import-source-should-not-has-extra-token.js [babel] format 1`] = `
diff --git a/tests/format/misc/errors/js/import-assertions-for-export-without-from.js b/tests/format/misc/errors/js/import-assertions-for-export-without-from.js
deleted file mode 100644
index 6c36a8437..000000000
--- a/tests/format/misc/errors/js/import-assertions-for-export-without-from.js
+++ /dev/null
@@ -1 +0,0 @@
-export { default as foo } assert { type: "json" };
diff --git a/tests/format/misc/errors/js/import-assertions-with-parens.js b/tests/format/misc/errors/js/import-assertions-with-parens.js
deleted file mode 100644
index f20676b37..000000000
--- a/tests/format/misc/errors/js/import-assertions-with-parens.js
+++ /dev/null
@@ -1 +0,0 @@
-import "x" assert ({type: 'json'});
diff --git a/yarn.lock b/yarn.lock
index 5e5330f5e..eed2a6c00 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -23,14 +23,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/code-frame@npm:8.0.0-beta.3":
-  version: 8.0.0-beta.3
-  resolution: "@babel/code-frame@npm:8.0.0-beta.3"
+"@babel/code-frame@npm:8.0.0-beta.4":
+  version: 8.0.0-beta.4
+  resolution: "@babel/code-frame@npm:8.0.0-beta.4"
   dependencies:
-    "@babel/helper-validator-identifier": "npm:^8.0.0-beta.3"
-    js-tokens: "npm:^8.0.0"
+    "@babel/helper-validator-identifier": "npm:^8.0.0-beta.4"
+    js-tokens: "npm:^10.0.0"
     picocolors: "npm:^1.1.1"
-  checksum: 10/64a99c5a31e11bdebac002db93ef0484b766165d841f966fcd03657ddc86a764e80ccdb8375e6b950ab0ecf4eac5ee2812866f4fee8a15da1d0ce7ca5b4e3329
+  checksum: 10/11bfcf81136ee40a4ed74e9ed363c798415196b0ca5b1636364819f0fcb2425ef729732536f0145a75d8db3297f2ea7913a17e331ba29cc3d3775967bc9fb4e4
   languageName: node
   linkType: hard
 
@@ -75,17 +75,17 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/generator@npm:8.0.0-beta.3":
-  version: 8.0.0-beta.3
-  resolution: "@babel/generator@npm:8.0.0-beta.3"
+"@babel/generator@npm:8.0.0-beta.4":
+  version: 8.0.0-beta.4
+  resolution: "@babel/generator@npm:8.0.0-beta.4"
   dependencies:
-    "@babel/parser": "npm:^8.0.0-beta.3"
-    "@babel/types": "npm:^8.0.0-beta.3"
+    "@babel/parser": "npm:^8.0.0-beta.4"
+    "@babel/types": "npm:^8.0.0-beta.4"
     "@jridgewell/gen-mapping": "npm:^0.3.12"
     "@jridgewell/trace-mapping": "npm:^0.3.28"
     "@types/jsesc": "npm:^2.5.0"
     jsesc: "npm:^3.0.2"
-  checksum: 10/949c6fce42edccc30950ac1370162426e9750be122c078da07d029d065b4da18b21f362b2c944543ef57ffcc62827be9612c20c97aa3b6aa5bf95e199598d547
+  checksum: 10/79a2130a454f43f80c4d4289eaa3b83afd7ed27e62878c0b070108ee321a3602e3edbcff213a80b16c2b0a7913ef3150ccb14cef3cdccc155c296d0fbb96cac6
   languageName: node
   linkType: hard
 
@@ -159,10 +159,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/helper-string-parser@npm:^8.0.0-beta.3":
-  version: 8.0.0-beta.3
-  resolution: "@babel/helper-string-parser@npm:8.0.0-beta.3"
-  checksum: 10/c3f172fc4724ee0ed3c1fc14daa8840a12592cbb7dce77d82beee5eed7598ac827a3c3f2f52691e9607d23a02c0824228f17d1f48621e5ecbec38b1154dd0117
+"@babel/helper-string-parser@npm:^8.0.0-beta.4":
+  version: 8.0.0-beta.4
+  resolution: "@babel/helper-string-parser@npm:8.0.0-beta.4"
+  checksum: 10/39fe9a7a2fcb7418d40248e515e7e40bc63a9f4320d7dc5e748094fa96cc20646a4e48e8492d507bdefcb94c558fefeb4acdc29cd510a1fd87c7a33f3f77d0d7
   languageName: node
   linkType: hard
 
@@ -173,10 +173,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/helper-validator-identifier@npm:^8.0.0-beta.3":
-  version: 8.0.0-beta.3
-  resolution: "@babel/helper-validator-identifier@npm:8.0.0-beta.3"
-  checksum: 10/0953ca90fa0657d6cc60653a95cdbbac89696784087e571d77d8e6f91d26a56aa98f5bbca856c992d216bf615f07fb934a640d93eab87fcbc714e4aa19fda5bd
+"@babel/helper-validator-identifier@npm:^8.0.0-beta.4":
+  version: 8.0.0-beta.4
+  resolution: "@babel/helper-validator-identifier@npm:8.0.0-beta.4"
+  checksum: 10/f011422956084af1f4ce51a1453083b77b20abb48eb95aef33df52d3328460c95848aaa92e59b618a9f334f58fb50d27f3fd66235fbfdd77e0a382c2a9aa650c
   languageName: node
   linkType: hard
 
@@ -209,14 +209,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/parser@npm:8.0.0-beta.3, @babel/parser@npm:^8.0.0-beta.3":
-  version: 8.0.0-beta.3
-  resolution: "@babel/parser@npm:8.0.0-beta.3"
+"@babel/parser@npm:8.0.0-beta.4, @babel/parser@npm:^8.0.0-beta.4":
+  version: 8.0.0-beta.4
+  resolution: "@babel/parser@npm:8.0.0-beta.4"
   dependencies:
-    "@babel/types": "npm:^8.0.0-beta.3"
+    "@babel/types": "npm:^8.0.0-beta.4"
   bin:
     parser: ./bin/babel-parser.js
-  checksum: 10/4ddc4112a8f5888c4f0ccc1c187ef0a8736de5f079dcf4e7bcd246a378eec83a37106ea16c08ae948b939be8cedbeeeb32ae97a6be5bede8bf6e59837d2c43a8
+  checksum: 10/41ea150c87ad2153efa245013fc6f6fa5be303403e2de0c4f2547f8529b92f242ae7a8a19f076a0bf63c494595fe40924421a6fbf4bc944378570d9df7849b82
   languageName: node
   linkType: hard
 
@@ -451,13 +451,13 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@babel/types@npm:8.0.0-beta.3, @babel/types@npm:^8.0.0-beta.3":
-  version: 8.0.0-beta.3
-  resolution: "@babel/types@npm:8.0.0-beta.3"
+"@babel/types@npm:8.0.0-beta.4, @babel/types@npm:^8.0.0-beta.4":
+  version: 8.0.0-beta.4
+  resolution: "@babel/types@npm:8.0.0-beta.4"
   dependencies:
-    "@babel/helper-string-parser": "npm:^8.0.0-beta.3"
-    "@babel/helper-validator-identifier": "npm:^8.0.0-beta.3"
-  checksum: 10/162784ece3223284dec9f97b08cf741ce07564cc25a563f47892c445b449e87c4b46864af4965814bc007e1ed5a73231031b7de80771572a5ecf3897fcf4169a
+    "@babel/helper-string-parser": "npm:^8.0.0-beta.4"
+    "@babel/helper-validator-identifier": "npm:^8.0.0-beta.4"
+  checksum: 10/31222a70050c3845c44c1339a7bc75bc6bcea48da754f8e8d59e36605d3bac9ce29707078a6ef44ddb102f6493aea508e73e35ea849683d3844cb412f35f85ce
   languageName: node
   linkType: hard
 
@@ -6483,6 +6483,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"js-tokens@npm:^10.0.0":
+  version: 10.0.0
+  resolution: "js-tokens@npm:10.0.0"
+  checksum: 10/88f536ec89f076fc230d29df255b3c55531237669d746d1868fca716b1e3f5f2e4abf8e5b8701903216e3f00d2dc3918d078b35da87772d433ab6a513c3bf76d
+  languageName: node
+  linkType: hard
+
 "js-tokens@npm:^4.0.0":
   version: 4.0.0
   resolution: "js-tokens@npm:4.0.0"
@@ -6490,13 +6497,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"js-tokens@npm:^8.0.0":
-  version: 8.0.3
-  resolution: "js-tokens@npm:8.0.3"
-  checksum: 10/af5ed8ddbc446a868c026599214f4a482ab52461edb82e547949255f98910a14bd81ddab88a8d570d74bd7dc96c6d4df7f963794ec5aaf13c53918cc46b9caa6
-  languageName: node
-  linkType: hard
-
 "js-yaml@npm:^3.13.1":
   version: 3.14.2
   resolution: "js-yaml@npm:3.14.2"
@@ -8360,10 +8360,10 @@ __metadata:
   resolution: "prettier@workspace:."
   dependencies:
     "@angular/compiler": "npm:21.1.0"
-    "@babel/code-frame": "npm:8.0.0-beta.3"
-    "@babel/generator": "npm:8.0.0-beta.3"
-    "@babel/parser": "npm:8.0.0-beta.3"
-    "@babel/types": "npm:8.0.0-beta.3"
+    "@babel/code-frame": "npm:8.0.0-beta.4"
+    "@babel/generator": "npm:8.0.0-beta.4"
+    "@babel/parser": "npm:8.0.0-beta.4"
+    "@babel/types": "npm:8.0.0-beta.4"
     "@eslint/js": "npm:9.39.2"
     "@glimmer/syntax": "npm:0.95.0"
     "@prettier/cli": "npm:0.10.0"