Function retry

retry<T>(
    fn: () => Promise<T>,
    options?: {
        attempts?: number;
        backoff?: number | ((attempt: number) => number);
    },
): Promise<T>
Retries an async function up to attempts times.

backoff controls the delay between attempts in milliseconds — either a fixed number or a function (attemptNumber) => delayMs (1-indexed). Defaults to no delay.

The error from the last failed attempt is rethrown.
Type Parameters
- T
Parameters
- fn: () => Promise<T>
- Optionaloptions: { attempts?: number; backoff?: number | ((attempt: number) => number) }
  - Optionalattempts?: number
    Total number of attempts (≥ 1). Default 3.
  - Optionalbackoff?: number | ((attempt: number) => number)
    Delay between attempts in ms, or a function of attempt number (1-indexed).
Returns Promise<T>
Example
```
await retry(() => fetch('/flaky'), { attempts: 3, backoff: 200 })
await retry(fetchUser, { attempts: 5, backoff: n => 100 * 2 ** (n - 1) }) // exponential
```
- Defined in src/async.ts:225