1import { throwIf } from '../throwErrorF/throwIfF.mts'
2
3export const assertValidIdx = <T,>(arr: T[], idx: number, ctx?: Record<string, unknown>): T => {
4  const item = arr[idx]
5  throwIf(() => item === undefined, {idx, arrLen: arr.length, ...ctx})
6  return item
7}
8