/**
 * Like `Promise.all(items.map(fn))`, but with at most `limit` calls in flight.
 * Results stay in input order.
 *
 * Rejections propagate, same as Promise.all — callers that need per-item
 * failure handling should catch inside `fn`.
 */
export declare function mapWithConcurrency<T, R>(items: readonly T[], limit: number, fn: (item: T, index: number) => Promise<R>): Promise<R[]>;
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