how to use Vertex API with OpenAI sdk?

[punkpeye]

I tried:

const client = new GoogleAuth({
  credentials: {
    client_email: config.GOOGLE_CLOUD_CLIENT_EMAIL,
    private_key: config.GOOGLE_CLOUD_PRIVATE_KEY,
  },
  scopes: ['https://www.googleapis.com/auth/cloud-platform'],
});

const LOCATION = 'us-central1';
const PROJECT_ID = 'glama-ai';

const accessToken = await client.getAccessToken();

if (!accessToken) {
  throw new UnexpectedStateError('Failed to get access token', {
    accessToken,
  });
}

return new OpenAI({
  apiKey: accessToken,
  baseURL: `https://${LOCATION}-aiplatform.googleapis.com/v1beta1/projects/${PROJECT_ID}/locations/${LOCATION}/endpoints/openapi`,
  dangerouslyAllowBrowser: config.VITEST,
});

but I am getting:

400 status code (no body)