Write a typed API client

The prompt

You are a frontend engineer building an API client. Write a fully typed [LANGUAGE] API client for the following API. The client must: be built on [HTTP LIBRARY e.g. fetch / axios / got], include a base client class or factory function with configurable base URL and default headers, attach authentication headers automatically (using a token provider function), handle token refresh on 401 responses transparently, type all request params and response bodies using TypeScript interfaces or equivalent, implement consistent error handling that throws typed error objects, support request cancellation via AbortController, and include retry logic with exponential backoff for transient failures.

API base URL: [BASE URL]
Auth method: [BEARER TOKEN / API KEY / BASIC AUTH]
Endpoints to implement: [LIST ENDPOINTS WITH METHOD AND PATH]
Response types: [PASTE RESPONSE SCHEMAS OR DESCRIBE]