Function retry_untilValue

retry_untilValue<T>(
    attempts: number,
    delaysMs: readonly number[],
    fn: (attempt: number) => Promise<T | null>,
): Promise<T | null>
Runs fn up to attempts times, sleeping between attempts, until it yields a non-null value.

The delay before retry N (1-based) is delaysMs[N-1], with the last entry reused when attempts outnumber delays; no sleep precedes the first attempt.
Type Parameters
- T
Parameters
- attempts: number
  Maximum number of attempts (at least 1).
- delaysMs: readonly number[]
  Backoff delays in milliseconds between attempts.
- fn: (attempt: number) => Promise<T | null>
  The operation; null means "failed, retry if attempts remain". Receives the 0-based attempt index.
Returns Promise<T | null>
The first non-null value, or null when every attempt failed.
Example
```
const record = await retry_untilValue(3, [250, 500], () => record_fetch(id));
```
- Defined in packages/cumin/src/utils/retry.ts:30