diff --git a/packages/core/package.json b/packages/core/package.json
index def05f274f..5cb1429b6a 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -43,6 +43,7 @@
     "@eggjs/koa": "workspace:*",
     "@eggjs/path-matching": "workspace:*",
     "@eggjs/router": "workspace:*",
+    "@eggjs/typings": "workspace:*",
     "@eggjs/utils": "workspace:*",
     "egg-logger": "catalog:",
     "get-ready": "catalog:",
diff --git a/packages/core/src/global.d.ts b/packages/core/src/global.d.ts
new file mode 100644
index 0000000000..ce0eed427e
--- /dev/null
+++ b/packages/core/src/global.d.ts
@@ -0,0 +1 @@
+/// <reference types="@eggjs/typings" />
diff --git a/packages/typings/package.json b/packages/typings/package.json
new file mode 100644
index 0000000000..21a6c272b5
--- /dev/null
+++ b/packages/typings/package.json
@@ -0,0 +1,49 @@
+{
+  "name": "@eggjs/typings",
+  "version": "1.0.0-beta.9",
+  "description": "Shared typings for Egg projects",
+  "keywords": [
+    "egg",
+    "typescript",
+    "typings"
+  ],
+  "homepage": "https://github.com/eggjs/egg/tree/next/packages/typings",
+  "bugs": {
+    "url": "https://github.com/eggjs/egg/issues"
+  },
+  "license": "MIT",
+  "author": "fengmk2 <fengmk2@gmail.com>",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/eggjs/egg.git",
+    "directory": "packages/typings"
+  },
+  "files": [
+    "dist"
+  ],
+  "type": "module",
+  "main": "./dist/index.js",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": "./src/index.ts",
+    "./package.json": "./package.json"
+  },
+  "publishConfig": {
+    "access": "public",
+    "exports": {
+      ".": "./dist/index.js",
+      "./package.json": "./package.json"
+    }
+  },
+  "scripts": {
+    "typecheck": "tsgo --noEmit"
+  },
+  "devDependencies": {
+    "@eggjs/tsconfig": "workspace:*",
+    "typescript": "catalog:"
+  },
+  "engines": {
+    "node": ">=22.18.0"
+  }
+}
diff --git a/packages/typings/src/index.ts b/packages/typings/src/index.ts
new file mode 100644
index 0000000000..594db7a3cb
--- /dev/null
+++ b/packages/typings/src/index.ts
@@ -0,0 +1,11 @@
+/**
+ * Module loader for bundled egg apps. Called with the raw `importModule()`
+ * filepath (posix-normalized) before `importResolve`, so bundled apps can
+ * serve modules that no longer exist on disk. Return `undefined` to fall
+ * through to the standard import path.
+ */
+export type BundleModuleLoader = (filepath: string) => unknown;
+
+declare global {
+  var __EGG_BUNDLE_MODULE_LOADER__: BundleModuleLoader | undefined;
+}
diff --git a/packages/typings/tsconfig.json b/packages/typings/tsconfig.json
new file mode 100644
index 0000000000..4082f16a5d
--- /dev/null
+++ b/packages/typings/tsconfig.json
@@ -0,0 +1,3 @@
+{
+  "extends": "../../tsconfig.json"
+}
diff --git a/packages/typings/tsdown.config.ts b/packages/typings/tsdown.config.ts
new file mode 100644
index 0000000000..6dfb63bdb8
--- /dev/null
+++ b/packages/typings/tsdown.config.ts
@@ -0,0 +1,7 @@
+import { defineConfig } from 'tsdown';
+
+export default defineConfig({
+  entry: {
+    index: 'src/index.ts',
+  },
+});
diff --git a/packages/utils/package.json b/packages/utils/package.json
index 9bcc0d82c8..5912c87588 100644
--- a/packages/utils/package.json
+++ b/packages/utils/package.json
@@ -35,7 +35,9 @@
   "scripts": {
     "typecheck": "tsgo --noEmit"
   },
-  "dependencies": {},
+  "dependencies": {
+    "@eggjs/typings": "workspace:*"
+  },
   "devDependencies": {
     "coffee": "catalog:",
     "mm": "catalog:",
diff --git a/packages/utils/src/import.ts b/packages/utils/src/import.ts
index 8a6e036e21..e506c06c6d 100644
--- a/packages/utils/src/import.ts
+++ b/packages/utils/src/import.ts
@@ -4,6 +4,8 @@ import path from 'node:path';
 import { pathToFileURL, fileURLToPath } from 'node:url';
 import { debuglog } from 'node:util';
 
+import type { BundleModuleLoader } from '@eggjs/typings';
+
 import { ImportResolveError } from './error/index.ts';
 
 const debug = debuglog('egg/utils/import');
@@ -394,7 +396,32 @@ export function setSnapshotModuleLoader(loader: SnapshotModuleLoader): void {
   isESM = false;
 }
 
+export type { BundleModuleLoader } from '@eggjs/typings';
+
+function normalizeBundleModulePath(filepath: string): string {
+  return filepath.split(path.win32.sep).join(path.posix.sep);
+}
+
+/**
+ * Register a bundle module loader. Uses globalThis so that bundled and
+ * external copies of @eggjs/utils share the same loader.
+ */
+export function setBundleModuleLoader(loader: BundleModuleLoader | undefined): void {
+  globalThis.__EGG_BUNDLE_MODULE_LOADER__ = loader;
+}
+
 export async function importModule(filepath: string, options?: ImportModuleOptions): Promise<any> {
+  const _bundleModuleLoader = globalThis.__EGG_BUNDLE_MODULE_LOADER__;
+  if (_bundleModuleLoader) {
+    const hit = _bundleModuleLoader(normalizeBundleModulePath(filepath));
+    if (hit !== undefined) {
+      let obj = hit as any;
+      if (obj?.default?.__esModule === true && 'default' in obj.default) obj = obj.default;
+      if (options?.importDefaultOnly && obj && typeof obj === 'object' && 'default' in obj) obj = obj.default;
+      return obj;
+    }
+  }
+
   const moduleFilePath = importResolve(filepath, options);
 
   if (_snapshotModuleLoader) {
diff --git a/packages/utils/test/__snapshots__/index.test.ts.snap b/packages/utils/test/__snapshots__/index.test.ts.snap
index a7d626f650..40c81c80d6 100644
--- a/packages/utils/test/__snapshots__/index.test.ts.snap
+++ b/packages/utils/test/__snapshots__/index.test.ts.snap
@@ -19,6 +19,7 @@ exports[`test/index.test.ts > export all > should keep checking 1`] = `
   "importResolve",
   "isESM",
   "isSupportTypeScript",
+  "setBundleModuleLoader",
   "setSnapshotModuleLoader",
 ]
 `;
diff --git a/packages/utils/test/bundle-import.test.ts b/packages/utils/test/bundle-import.test.ts
new file mode 100644
index 0000000000..8ce53344a3
--- /dev/null
+++ b/packages/utils/test/bundle-import.test.ts
@@ -0,0 +1,90 @@
+import { strict as assert } from 'node:assert';
+import path from 'node:path';
+
+import { afterEach, describe, it } from 'vitest';
+
+import { importModule, setBundleModuleLoader } from '../src/import.ts';
+import { getFilepath } from './helper.ts';
+
+describe('test/bundle-import.test.ts', () => {
+  afterEach(() => {
+    setBundleModuleLoader(undefined);
+  });
+
+  it('returns the real module when no bundle loader is registered', async () => {
+    const result = await importModule(getFilepath('esm'));
+    assert.ok(result);
+    assert.equal(typeof result, 'object');
+  });
+
+  it('intercepts importModule with the registered loader', async () => {
+    const seen: string[] = [];
+    const fakeModule = { default: { hello: 'bundle' }, other: 'stuff' };
+    setBundleModuleLoader((p) => {
+      seen.push(p);
+      if (p.endsWith('/fixtures/esm')) return fakeModule;
+    });
+
+    const result = await importModule(getFilepath('esm'));
+    assert.deepEqual(result, fakeModule);
+    assert.ok(seen.some((p) => p.endsWith('/fixtures/esm')));
+  });
+
+  it('honors importDefaultOnly when the bundle hit has a default key', async () => {
+    setBundleModuleLoader(() => ({ default: { greet: 'hi' }, other: 'x' }));
+
+    const result = await importModule(getFilepath('esm'), { importDefaultOnly: true });
+    assert.deepEqual(result, { greet: 'hi' });
+  });
+
+  it('keeps non-default bundle hits when importDefaultOnly is enabled', async () => {
+    const fakeModule = { named: 'bundle' };
+    setBundleModuleLoader(() => fakeModule);
+
+    const result = await importModule(getFilepath('esm'), { importDefaultOnly: true });
+    assert.deepEqual(result, fakeModule);
+  });
+
+  it('keeps null bundle hits when importDefaultOnly is enabled', async () => {
+    setBundleModuleLoader(() => null);
+
+    const result = await importModule(getFilepath('esm'), { importDefaultOnly: true });
+    assert.equal(result, null);
+  });
+
+  it('unwraps __esModule double-default shape', async () => {
+    setBundleModuleLoader(() => ({
+      default: { __esModule: true, default: { fn: 'bundled' } },
+    }));
+
+    const result = await importModule(getFilepath('esm'));
+    assert.equal(result.__esModule, true);
+    assert.deepEqual(result.default, { fn: 'bundled' });
+  });
+
+  it('falls through to normal import when loader returns undefined', async () => {
+    setBundleModuleLoader(() => undefined);
+
+    const result = await importModule(getFilepath('esm'));
+    assert.ok(result);
+    assert.equal(result.default.foo, 'bar');
+  });
+
+  it('serves virtual specifiers from the loader without requiring them on disk', async () => {
+    const fakeModule = { virtual: true };
+    setBundleModuleLoader((p) => (p === 'virtual/not-on-disk' ? fakeModule : undefined));
+
+    const result = await importModule('virtual/not-on-disk');
+    assert.deepEqual(result, fakeModule);
+  });
+
+  it('normalizes Windows-style bundle paths before loader lookup', async () => {
+    const fakeModule = { windows: true };
+    const filepath = getFilepath('esm').split(path.posix.sep).join(path.win32.sep);
+
+    setBundleModuleLoader((p) => (p.endsWith('/fixtures/esm') ? fakeModule : undefined));
+
+    const result = await importModule(filepath);
+    assert.deepEqual(result, fakeModule);
+  });
+});
diff --git a/tsconfig.json b/tsconfig.json
index 0a167c7226..f3161428b1 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -17,6 +17,9 @@
     {
       "path": "./packages/core"
     },
+    {
+      "path": "./packages/typings"
+    },
     {
       "path": "./packages/errors"
     },