Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Reject empty baseURL values

If a caller passes baseURL: '' (e.g., from an unset env var), the opts.baseURL check is falsy so validation is skipped, but the constructor still uses the empty string because ?? does not fall back on ''. This results in Configuration.baseURL being empty, and later new URL(${request.baseURL}${request.url}) in src/resource.ts throws for relative-only URLs, breaking all requests at runtime. Consider treating empty/whitespace strings as invalid or falling back to the env default.

Useful? React with 👍 / 👎.