diff --git a/.github/generated/ast_changes_watch_list.yml b/.github/generated/ast_changes_watch_list.yml
index 245f5466aaa24..d826c8b346af3 100644
--- a/.github/generated/ast_changes_watch_list.yml
+++ b/.github/generated/ast_changes_watch_list.yml
@@ -74,7 +74,7 @@ src:
   - 'napi/parser/generated/lazy/walk.mjs'
   - 'napi/parser/generated/visit/keys.mjs'
   - 'napi/parser/generated/visit/types.mjs'
-  - 'napi/parser/generated/visit/visitor.d.ts'
+  - 'napi/parser/generated/visit/visitor.d.mts'
   - 'napi/parser/generated/visit/walk.mjs'
   - 'napi/parser/src/generated/assert_layouts.rs'
   - 'napi/parser/src/generated/derive_estree.rs'
diff --git a/apps/oxlint/scripts/build.js b/apps/oxlint/scripts/build.js
index 622330dffb092..c813a1b092e84 100755
--- a/apps/oxlint/scripts/build.js
+++ b/apps/oxlint/scripts/build.js
@@ -34,7 +34,7 @@ const parserFilePaths = [
   */
   'generated/deserialize/ts.mjs',
   'generated/visit/types.mjs',
-  'generated/visit/visitor.d.ts',
+  'generated/visit/visitor.d.mts',
   'generated/visit/walk.mjs',
 ];
 
diff --git a/apps/oxlint/src-js/plugins/types.ts b/apps/oxlint/src-js/plugins/types.ts
index d9e34df585579..9ee44985eaccc 100644
--- a/apps/oxlint/src-js/plugins/types.ts
+++ b/apps/oxlint/src-js/plugins/types.ts
@@ -6,7 +6,7 @@ export interface Visitor {
 }
 */
 
-import type { VisitorObject as Visitor } from '../../dist/generated/visit/visitor.d.ts';
+import type { VisitorObject as Visitor } from '../../dist/generated/visit/visitor.d.mts';
 export type { Visitor };
 
 // Hook function that runs before traversal.
diff --git a/dprint.json b/dprint.json
index 83fcfee85cb69..0726e30017aba 100644
--- a/dprint.json
+++ b/dprint.json
@@ -28,6 +28,7 @@
     "napi/{parser,transform,minify,playground}/**/wasi-worker.mjs",
     "napi/{parser,transform,minify,playground}/**/browser.js",
     "napi/parser/src-js/bindings.mjs",
+    "napi/parser/src-js/index.d.mts",
     "npm/*/package.json",
     "npm/oxlint/configuration_schema.json",
     "npm/oxc-wasm/**",
diff --git a/napi/parser/generated/visit/visitor.d.ts b/napi/parser/generated/visit/visitor.d.mts
similarity index 100%
rename from napi/parser/generated/visit/visitor.d.ts
rename to napi/parser/generated/visit/visitor.d.mts
diff --git a/napi/parser/package.json b/napi/parser/package.json
index eb3e57fc3dfc7..9b36238a41aa0 100644
--- a/napi/parser/package.json
+++ b/napi/parser/package.json
@@ -5,7 +5,7 @@
   "main": "src-js/index.mjs",
   "browser": "src-js/wasm.mjs",
   "scripts": {
-    "build-dev": "napi build --esm --platform --js bindings.mjs --output-dir src-js",
+    "build-dev": "napi build --esm --platform --js bindings.mjs --dts index.d.mts --output-dir src-js",
     "build-test": "pnpm run build-dev --profile coverage",
     "build": "pnpm run build-dev --features allocator --release",
     "postbuild-dev": "node scripts/patch.mjs",
@@ -46,10 +46,10 @@
     "generated/lazy/walk.mjs",
     "generated/visit/keys.mjs",
     "generated/visit/types.mjs",
-    "generated/visit/visitor.d.ts",
+    "generated/visit/visitor.d.mts",
     "generated/visit/walk.mjs",
     "src-js/bindings.mjs",
-    "src-js/index.d.ts",
+    "src-js/index.d.mts",
     "src-js/index.mjs",
     "src-js/wasm.mjs",
     "src-js/webcontainer-fallback.js",
@@ -107,6 +107,6 @@
         "fs": false
       }
     },
-    "dtsHeaderFile": "src-js/header.d.ts"
+    "dtsHeaderFile": "src-js/header.d.mts"
   }
 }
diff --git a/napi/parser/src-js/header.d.ts b/napi/parser/src-js/header.d.mts
similarity index 84%
rename from napi/parser/src-js/header.d.ts
rename to napi/parser/src-js/header.d.mts
index 7773551b02753..542727d2a3cbb 100644
--- a/napi/parser/src-js/header.d.ts
+++ b/napi/parser/src-js/header.d.mts
@@ -2,12 +2,14 @@
 /* eslint-disable */
 
 import type { Program } from '@oxc-project/types';
-import type { VisitorObject } from '../generated/visit/visitor.d.ts';
+import type { VisitorObject } from '../generated/visit/visitor.d.mts';
 
 export * from '@oxc-project/types';
 
 export { VisitorObject };
 
+export const visitorKeys: Record<string, string[]>;
+
 export class Visitor {
   constructor(visitor: VisitorObject);
   visit(program: Program): void;
diff --git a/napi/parser/src-js/index.d.ts b/napi/parser/src-js/index.d.mts
similarity index 99%
rename from napi/parser/src-js/index.d.ts
rename to napi/parser/src-js/index.d.mts
index d74fc0834f38d..9ef6ee174f22b 100644
--- a/napi/parser/src-js/index.d.ts
+++ b/napi/parser/src-js/index.d.mts
@@ -2,12 +2,14 @@
 /* eslint-disable */
 
 import type { Program } from '@oxc-project/types';
-import type { VisitorObject } from '../generated/visit/visitor.d.ts';
+import type { VisitorObject } from '../generated/visit/visitor.d.mts';
 
 export * from '@oxc-project/types';
 
 export { VisitorObject };
 
+export const visitorKeys: Record<string, string[]>;
+
 export class Visitor {
   constructor(visitor: VisitorObject);
   visit(program: Program): void;
diff --git a/napi/parser/test/parse-raw.test.ts b/napi/parser/test/parse-raw.test.ts
index 13885258805eb..aba12faa9465f 100644
--- a/napi/parser/test/parse-raw.test.ts
+++ b/napi/parser/test/parse-raw.test.ts
@@ -5,7 +5,7 @@ import { basename, join as pathJoin } from 'node:path';
 import Tinypool from 'tinypool';
 import { describe, expect, it } from 'vitest';
 
-import { parseAsync, parseSync } from '../src-js/index.mjs';
+import { parseAsync, parseSync, type TSTypeAliasDeclaration, type VariableDeclaration } from '../src-js/index.mjs';
 
 import {
   ACORN_TEST262_DIR_PATH,
@@ -273,7 +273,8 @@ describe.concurrent('`preserveParens` option', () => {
       // @ts-ignore
       let ret = parseSync('test.js', code, { experimentalRawTransfer: true, preserveParens: false });
       expect(ret.errors.length).toBe(0);
-      expect(ret.program.body[0].declarations[0].init.type).toBe('BinaryExpression');
+      const firstStatement = ret.program.body[0] as VariableDeclaration;
+      expect(firstStatement.declarations[0].init.type).toBe('BinaryExpression');
     });
 
     it.concurrent('TS', async () => {
@@ -282,8 +283,10 @@ describe.concurrent('`preserveParens` option', () => {
       // @ts-ignore
       let ret = parseSync('test.ts', code, { experimentalRawTransfer: true, preserveParens: false });
       expect(ret.errors.length).toBe(0);
-      expect(ret.program.body[0].declarations[0].init.type).toBe('BinaryExpression');
-      expect(ret.program.body[1].typeAnnotation.type).toBe('TSStringKeyword');
+      const firstStatement = ret.program.body[0] as VariableDeclaration;
+      expect(firstStatement.declarations[0].init.type).toBe('BinaryExpression');
+      const secondStatement = ret.program.body[1] as TSTypeAliasDeclaration;
+      expect(secondStatement.typeAnnotation.type).toBe('TSStringKeyword');
     });
   });
 
@@ -294,7 +297,8 @@ describe.concurrent('`preserveParens` option', () => {
       // @ts-ignore
       let ret = parseSync('test.js', code, { experimentalRawTransfer: true, preserveParens: true });
       expect(ret.errors.length).toBe(0);
-      expect(ret.program.body[0].declarations[0].init.type).toBe('ParenthesizedExpression');
+      const firstStatement = ret.program.body[0] as VariableDeclaration;
+      expect(firstStatement.declarations[0].init.type).toBe('ParenthesizedExpression');
     });
 
     it.concurrent('TS', async () => {
@@ -303,8 +307,10 @@ describe.concurrent('`preserveParens` option', () => {
       // @ts-ignore
       let ret = parseSync('test.ts', code, { experimentalRawTransfer: true, preserveParens: true });
       expect(ret.errors.length).toBe(0);
-      expect(ret.program.body[0].declarations[0].init.type).toBe('ParenthesizedExpression');
-      expect(ret.program.body[1].typeAnnotation.type).toBe('TSParenthesizedType');
+      const firstStatement = ret.program.body[0] as VariableDeclaration;
+      expect(firstStatement.declarations[0].init.type).toBe('ParenthesizedExpression');
+      const secondStatement = ret.program.body[1] as TSTypeAliasDeclaration;
+      expect(secondStatement.typeAnnotation.type).toBe('TSParenthesizedType');
     });
   });
 });
diff --git a/napi/parser/test/visit.test.ts b/napi/parser/test/visit.test.ts
index 32c099729ab0a..461c6d1da6829 100644
--- a/napi/parser/test/visit.test.ts
+++ b/napi/parser/test/visit.test.ts
@@ -1,6 +1,6 @@
 import { describe, expect, it } from 'vitest';
 
-import { parseSync, Visitor, visitorKeys } from '../src-js/index.mjs';
+import { parseSync, Visitor, visitorKeys, type VisitorObject } from '../src-js/index.mjs';
 
 describe('visit', () => {
   it('empty visitor', () => {
@@ -12,6 +12,7 @@ describe('visit', () => {
 
   describe('invalid visitor', () => {
     it('undefined visitor object', () => {
+      // @ts-ignore
       expect(() => new Visitor()).toThrow(new TypeError('Visitor must be an object'));
     });
 
@@ -20,19 +21,23 @@ describe('visit', () => {
     });
 
     it('boolean visitor object', () => {
-      expect(() => new Visitor(true)).toThrow(new TypeError('Visitor must be an object'));
+      expect(() => new Visitor(true as unknown as VisitorObject)).toThrow(new TypeError('Visitor must be an object'));
     });
 
     it('unknown type in entry', () => {
-      expect(() => new Visitor({ Foo() {} })).toThrow(new Error("Unknown node type 'Foo' in visitor object"));
+      expect(() => new Visitor({ Foo() {} } as VisitorObject)).toThrow(
+        new Error("Unknown node type 'Foo' in visitor object"),
+      );
     });
 
     it('unknown type in exit', () => {
-      expect(() => new Visitor({ 'Foo:exit'() {} })).toThrow(new Error("Unknown node type 'Foo' in visitor object"));
+      expect(() => new Visitor({ 'Foo:exit'() {} } as VisitorObject)).toThrow(
+        new Error("Unknown node type 'Foo' in visitor object"),
+      );
     });
 
     it('invalid postfix', () => {
-      expect(() => new Visitor({ 'Identifier:foo'() {} })).toThrow(
+      expect(() => new Visitor({ 'Identifier:foo'() {} } as VisitorObject)).toThrow(
         new Error("Unknown node type 'Identifier:foo' in visitor object"),
       );
     });
diff --git a/tasks/ast_tools/src/generators/estree_visit.rs b/tasks/ast_tools/src/generators/estree_visit.rs
index edbb4c01a8ae2..364af39825b11 100644
--- a/tasks/ast_tools/src/generators/estree_visit.rs
+++ b/tasks/ast_tools/src/generators/estree_visit.rs
@@ -52,7 +52,7 @@ impl Generator for ESTreeVisitGenerator {
                 code: type_ids_map,
             },
             Output::Javascript {
-                path: format!("{NAPI_PARSER_PACKAGE_PATH}/generated/visit/visitor.d.ts"),
+                path: format!("{NAPI_PARSER_PACKAGE_PATH}/generated/visit/visitor.d.mts"),
                 code: visitor_type,
             },
         ]