/** Result of an acquire attempt, with the queue depth it observed. */
export interface SemaphoreAcquireReport {
    acquired: boolean;
    /**
     * For a timed-out waiter, queue depth at the moment it settled, including
     * that waiter. Other reports count waiters that remain queued.
     * A timed-out waiter leaves the queue before its caller resumes, so reading
     * {@link Semaphore.waiting} afterwards understates the depth it observed.
     */
    waiting: number;
}
export declare class Semaphore {
    private permits;
    private readonly maxQueueSize;
    private waitQueue;
    constructor(permits: number, options?: {
        maxQueueSize?: number;
    });
    tryAcquire(timeoutMs?: number, options?: {
        signal?: AbortSignal;
    }): Promise<boolean>;
    /**
     * Acquire a permit and report the queue depth the attempt observed. Use this
     * instead of {@link tryAcquire} when a failure needs an accurate diagnostic.
     */
    tryAcquireWithReport(timeoutMs?: number, options?: {
        signal?: AbortSignal;
    }): Promise<SemaphoreAcquireReport>;
    release(): void;
    get available(): number;
    get waiting(): number;
}
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