createVertex forces googleAuthOptions even when using proxy baseURL + x-litellm-api-key, making proxy-only auth awkward #7327
Description
Description
When using @ai-sdk/google-vertex with a custom baseURL pointing to a Proxy (e.g., LiteLLM) and authenticating via x-litellm-api-key, the SDK still requires googleAuthOptions to prevent an authentication error—even though the proxy handles Google auth. This makes googleAuthOptions effectively useless in this flow, as the actual authentication happens at the proxy using the API key.
AI SDK Version
@ai-sdk/google-vertex: 2.2.26