/**
 * Minimal async mutex for serializing access to a resource.
 *
 * `acquire()` resolves only once all previously acquired holders have released,
 * so awaiting callers run one at a time in FIFO order.
 */
export declare class AsyncLock {
    /** Resolves when the currently-held lock (if any) is released. */
    private _tail;
    /**
     * Acquires the lock, waiting until all previously-acquired holders release.
     *
     * Declare the result with `using` to release the lock at scope exit:
     * `using _lock = await lock.acquire()`.
     *
     * @returns A handle whose disposal releases the lock. Disposal is idempotent.
     */
    acquire(): Promise<{
        [Symbol.dispose](): void;
    }>;
}
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