export declare const DEFAULT_CONCURRENCY = 4;
export declare class AbortedError extends Error {
    constructor(message?: string);
}
/**
 * Map `items` through `fn` with at most `limit` in flight, preserving input
 * order in the result. A rejection is propagated once every in-flight worker
 * has settled (so no rejection is left unhandled) and no further items start.
 *
 * `signal` stops *scheduling*; work already in flight is expected to honour the
 * same signal itself (every runner in utils/exec.ts does).
 */
export declare function mapLimit<T, R>(items: readonly T[], limit: number, fn: (item: T, index: number) => Promise<R>, signal?: AbortSignal): Promise<R[]>;
/** mapLimit over the entries of a record, keyed results back into a record. */
export declare function mapRecordLimit<V, R>(record: Record<string, V>, limit: number, fn: (key: string, value: V) => Promise<R>, signal?: AbortSignal): Promise<Record<string, R>>;