/**
 * Copyright (c) 2025 Elara AI Pty Ltd
 * Licensed under BSL 1.1. See LICENSE for details.
 */
/**
 * Run `fn` exclusively with respect to other callers sharing `key`.
 *
 * @param key - The serialization key; only tasks with an equal key are ordered.
 * @param fn - The work to run once the key is free.
 * @returns A promise for `fn`'s result (it rejects iff `fn` rejects; a prior
 *   task's failure never blocks or fails a later one).
 */
export declare function withKeyedLock<T>(key: string, fn: () => Promise<T>): Promise<T>;
/**
 * Number of keys with an in-flight or queued task. Exposed for tests to assert
 * the map drains to empty (no leak); not part of the coordination contract.
 *
 * @internal
 */
export declare function pendingKeyCount(): number;
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