@ai-sdk/google-vertex/src/google-vertex-auth-google-auth-library.ts

The **[Google Vertex provider](https://ai-sdk.dev/providers/ai-sdk-providers/google-vertex)** for the [AI SDK](https://ai-sdk.dev/docs) contains language model support for the [Google Vertex AI](https://cloud.google.com/vertex-ai) APIs.

import { GoogleAuth, type GoogleAuthOptions } from 'google-auth-library';

export function createAuthTokenGenerator(options?: GoogleAuthOptions) {
  const auth = new GoogleAuth({
    scopes: ['https://www.googleapis.com/auth/cloud-platform'],
    ...options,
  });

  return async function generateAuthToken() {
    const client = await auth.getClient();
    const token = await client.getAccessToken();
    return token?.token ?? null;
  };
}