Write a retry function. It takes an async function and options: the number of attempts, a base delay, and an AbortSignal. It calls the function and, on error, retries it with an exponentially growing delay. It returns a promise with the first successful result or the last error.

How to approach it

They're checking whether you can write a reliable, production-grade async utility. What matters is a correct attempt loop, exponential backoff with jitter and a cap, honest cancellation via AbortSignal without leaking timers and listeners, filtering out non-retryable errors, and the ability to clarify requirements and explain your plan before writing code.