/**
 * A tiny fixed-size worker pool — the concurrency primitive shared by the
 * shard runner and the legacy `--workspace` fan-out.
 *
 * Each of `concurrency` slots pulls the next item off a shared queue, runs
 * `run(item)`, and repeats until the queue is empty. The cap bounds how
 * many child processes run at once (memory/oversubscription control); the
 * total number of items is unbounded.
 *
 * Results are returned in COMPLETION order, not input order — callers that
 * need determinism sort afterward (shards sort by shardId).
 *
 * @throws {TypeError} When `concurrency` is not a finite number.
 */
export declare function runWorkerPool<I, O>(items: readonly I[], concurrency: number, run: (item: I) => Promise<O>): Promise<O[]>;
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