diff --git a/.changeset/unlucky-goats-teach.md b/.changeset/unlucky-goats-teach.md
new file mode 100644
index 00000000000..5e4bc68dc03
--- /dev/null
+++ b/.changeset/unlucky-goats-teach.md
@@ -0,0 +1,5 @@
+---
+'@firebase/ai': patch
+---
+
+Exclude ChromeAdapterImpl code from Node entry point.
diff --git a/packages/ai/package.json b/packages/ai/package.json
index 8000ec4e99d..a1fb8eefa20 100644
--- a/packages/ai/package.json
+++ b/packages/ai/package.json
@@ -39,7 +39,9 @@
     "test:ci": "yarn testsetup && node ../../scripts/run_tests_in_ci.js -s test",
     "test:skip-clone": "karma start",
     "test:browser": "yarn testsetup && karma start",
+    "test:node": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\"}' mocha --require ts-node/register --require src/index.node.ts 'src/**/!(*-browser)*.test.ts' --config ../../config/mocharc.node.js",
     "test:integration": "karma start --integration",
+    "test:integration:node": "TS_NODE_COMPILER_OPTIONS='{\"module\":\"commonjs\"}' mocha integration/**/*.test.ts --config ../../config/mocharc.node.js",
     "api-report": "api-extractor run --local --verbose",
     "typings:public": "node ../../scripts/build/use_typings.js ./dist/ai-public.d.ts",
     "trusted-type-check": "tsec -p tsconfig.json --noEmit"
diff --git a/packages/ai/src/api.ts b/packages/ai/src/api.ts
index 26d2904150d..2cb8e670277 100644
--- a/packages/ai/src/api.ts
+++ b/packages/ai/src/api.ts
@@ -32,8 +32,6 @@ import { AIError } from './errors';
 import { AIModel, GenerativeModel, ImagenModel } from './models';
 import { encodeInstanceIdentifier } from './helpers';
 import { GoogleAIBackend } from './backend';
-import { ChromeAdapterImpl } from './methods/chrome-adapter';
-import { LanguageModel } from './types/language-model';
 
 export { ChatSession } from './methods/chat-session';
 export * from './requests/schema-builder';
@@ -124,15 +122,17 @@ export function getGenerativeModel(
       `Must provide a model name. Example: getGenerativeModel({ model: 'my-model-name' })`
     );
   }
-  let chromeAdapter: ChromeAdapterImpl | undefined;
-  // Do not initialize a ChromeAdapter if we are not in hybrid mode.
-  if (typeof window !== 'undefined' && hybridParams.mode) {
-    chromeAdapter = new ChromeAdapterImpl(
-      window.LanguageModel as LanguageModel,
-      hybridParams.mode,
-      hybridParams.onDeviceParams
-    );
-  }
+
+  /**
+   * An AIService registered by index.node.ts will not have a
+   * chromeAdapterFactory() method.
+   */
+  const chromeAdapter = (ai as AIService).chromeAdapterFactory?.(
+    hybridParams.mode,
+    typeof window === 'undefined' ? undefined : window,
+    hybridParams.onDeviceParams
+  );
+
   return new GenerativeModel(ai, inCloudParams, requestOptions, chromeAdapter);
 }
 
diff --git a/packages/ai/src/index.ts b/packages/ai/src/index.ts
index 8ac9db61b6d..7758c316674 100644
--- a/packages/ai/src/index.ts
+++ b/packages/ai/src/index.ts
@@ -34,10 +34,12 @@ import { name, version } from '../package.json';
 import { decodeInstanceIdentifier } from './helpers';
 import { AIError } from './api';
 import { AIErrorCode } from './types';
+import { chromeAdapterFactory } from './methods/chrome-adapter';
+import { LanguageModel } from './types/language-model';
 
 declare global {
   interface Window {
-    [key: string]: unknown;
+    LanguageModel: LanguageModel;
   }
 }
 
@@ -58,7 +60,14 @@ export function factory(
   const app = container.getProvider('app').getImmediate();
   const auth = container.getProvider('auth-internal');
   const appCheckProvider = container.getProvider('app-check-internal');
-  return new AIService(app, backend, auth, appCheckProvider);
+
+  return new AIService(
+    app,
+    backend,
+    auth,
+    appCheckProvider,
+    chromeAdapterFactory
+  );
 }
 
 function registerAI(): void {
diff --git a/packages/ai/src/methods/chrome-adapter.test.ts b/packages/ai/src/methods/chrome-adapter-browser.test.ts
similarity index 98%
rename from packages/ai/src/methods/chrome-adapter.test.ts
rename to packages/ai/src/methods/chrome-adapter-browser.test.ts
index 83610f3dcd6..5d5b2344ab6 100644
--- a/packages/ai/src/methods/chrome-adapter.test.ts
+++ b/packages/ai/src/methods/chrome-adapter-browser.test.ts
@@ -19,7 +19,7 @@ import { AIError } from '../errors';
 import { expect, use } from 'chai';
 import sinonChai from 'sinon-chai';
 import chaiAsPromised from 'chai-as-promised';
-import { ChromeAdapterImpl } from './chrome-adapter';
+import { chromeAdapterFactory, ChromeAdapterImpl } from './chrome-adapter';
 import {
   Availability,
   LanguageModel,
@@ -771,6 +771,20 @@ describe('ChromeAdapter', () => {
   });
 });
 
+describe('chromeAdapterFactory', () => {
+  it('creates a populated ChromeAdapterImpl', () => {
+    const fakeLanguageModel = {} as LanguageModel;
+    const adapter = chromeAdapterFactory(
+      InferenceMode.PREFER_ON_DEVICE,
+      { LanguageModel: fakeLanguageModel } as Window,
+      { createOptions: {} }
+    );
+    expect(adapter?.languageModelProvider).to.equal(fakeLanguageModel);
+    expect(adapter?.mode).to.equal(InferenceMode.PREFER_ON_DEVICE);
+    expect(adapter?.onDeviceParams.createOptions).to.exist;
+  });
+});
+
 // TODO: Move to using image from test-utils.
 const sampleBase64EncodedImage =
   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';
diff --git a/packages/ai/src/methods/chrome-adapter.ts b/packages/ai/src/methods/chrome-adapter.ts
index 8fc4b23e665..a0ab509e335 100644
--- a/packages/ai/src/methods/chrome-adapter.ts
+++ b/packages/ai/src/methods/chrome-adapter.ts
@@ -48,9 +48,9 @@ export class ChromeAdapterImpl implements ChromeAdapter {
   private downloadPromise: Promise<LanguageModel | void> | undefined;
   private oldSession: LanguageModel | undefined;
   constructor(
-    private languageModelProvider: LanguageModel,
-    private mode: InferenceMode,
-    private onDeviceParams: OnDeviceParams = {
+    public languageModelProvider: LanguageModel,
+    public mode: InferenceMode,
+    public onDeviceParams: OnDeviceParams = {
       createOptions: {
         // Defaults to support image inputs for convenience.
         expectedInputs: [{ type: 'image' }]
@@ -372,3 +372,21 @@ export class ChromeAdapterImpl implements ChromeAdapter {
     } as Response;
   }
 }
+
+/**
+ * Creates a ChromeAdapterImpl on demand.
+ */
+export function chromeAdapterFactory(
+  mode: InferenceMode,
+  window?: Window,
+  params?: OnDeviceParams
+): ChromeAdapterImpl | undefined {
+  // Do not initialize a ChromeAdapter if we are not in hybrid mode.
+  if (typeof window !== 'undefined' && mode) {
+    return new ChromeAdapterImpl(
+      (window as Window).LanguageModel as LanguageModel,
+      mode,
+      params
+    );
+  }
+}
diff --git a/packages/ai/src/service.ts b/packages/ai/src/service.ts
index c5c9d9a036d..0beb8dda1c3 100644
--- a/packages/ai/src/service.ts
+++ b/packages/ai/src/service.ts
@@ -16,7 +16,7 @@
  */
 
 import { FirebaseApp, _FirebaseService } from '@firebase/app';
-import { AI, AIOptions } from './public-types';
+import { AI, AIOptions, InferenceMode, OnDeviceParams } from './public-types';
 import {
   AppCheckInternalComponentName,
   FirebaseAppCheckInternal
@@ -27,6 +27,7 @@ import {
   FirebaseAuthInternalName
 } from '@firebase/auth-interop-types';
 import { Backend, VertexAIBackend } from './backend';
+import { ChromeAdapterImpl } from './methods/chrome-adapter';
 
 export class AIService implements AI, _FirebaseService {
   auth: FirebaseAuthInternal | null;
@@ -38,7 +39,12 @@ export class AIService implements AI, _FirebaseService {
     public app: FirebaseApp,
     public backend: Backend,
     authProvider?: Provider<FirebaseAuthInternalName>,
-    appCheckProvider?: Provider<AppCheckInternalComponentName>
+    appCheckProvider?: Provider<AppCheckInternalComponentName>,
+    public chromeAdapterFactory?: (
+      mode: InferenceMode,
+      window?: Window,
+      params?: OnDeviceParams
+    ) => ChromeAdapterImpl | undefined
   ) {
     const appCheck = appCheckProvider?.getImmediate({ optional: true });
     const auth = authProvider?.getImmediate({ optional: true });
diff --git a/packages/ai/test-utils/convert-mocks.ts b/packages/ai/test-utils/convert-mocks.ts
index 4bac70d1d10..34233a73ace 100644
--- a/packages/ai/test-utils/convert-mocks.ts
+++ b/packages/ai/test-utils/convert-mocks.ts
@@ -19,6 +19,8 @@
 const { readdirSync, readFileSync, writeFileSync } = require('node:fs');
 const { join } = require('node:path');
 
+type BackendName = import('./types').BackendName; // Import type without triggering ES module detection
+
 const MOCK_RESPONSES_DIR_PATH = join(
   __dirname,
   'vertexai-sdk-test-data',
@@ -26,8 +28,6 @@ const MOCK_RESPONSES_DIR_PATH = join(
 );
 const MOCK_LOOKUP_OUTPUT_PATH = join(__dirname, 'mocks-lookup.ts');
 
-type BackendName = 'vertexAI' | 'googleAI';
-
 const mockDirs: Record<BackendName, string> = {
   vertexAI: join(MOCK_RESPONSES_DIR_PATH, 'vertexai'),
   googleAI: join(MOCK_RESPONSES_DIR_PATH, 'googleai')
diff --git a/packages/ai/test-utils/mock-response.ts b/packages/ai/test-utils/mock-response.ts
index 5128ddabe74..4963bcbb193 100644
--- a/packages/ai/test-utils/mock-response.ts
+++ b/packages/ai/test-utils/mock-response.ts
@@ -15,6 +15,7 @@
  * limitations under the License.
  */
 
+import { BackendName } from './types';
 import { vertexAIMocksLookup, googleAIMocksLookup } from './mocks-lookup';
 
 const mockSetMaps: Record<BackendName, Record<string, string>> = {
diff --git a/packages/ai/test-utils/types.d.ts b/packages/ai/test-utils/types.d.ts
new file mode 100644
index 00000000000..00b99eef55a
--- /dev/null
+++ b/packages/ai/test-utils/types.d.ts
@@ -0,0 +1,18 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export type BackendName = 'vertexAI' | 'googleAI';