/**
 * Runs `fn` over `items` with at most `parallel` calls in flight. Results
 * come back in item order, whatever order the calls finish in. `parallel`
 * is clamped to at least one worker; a non-finite value means one.
 */
export declare function mapInParallel<T, R>(items: readonly T[], parallel: number, fn: (item: T, index: number) => Promise<R>): Promise<R[]>;