export declare function createPromiseCapability(): {
    promise: Promise<any>;
    resolve: Function;
    reject: Function;
};
export declare function createPromiseCapabilityWithTimeout(rejectTimeout?: number, timeoutMessage?: string): {
    promise: Promise<any>;
    resolve: Function;
    reject: Function;
};
export declare class AsyncLock {
    private _queue;
    private _isLocked;
    get locked(): boolean;
    lock(): Promise<void>;
    unlock(): void;
}
export declare class PromiseQueue {
    private _queue;
    private _queueId;
    constructor();
    enqueue(action: Function): Promise<unknown>;
    clear(): void;
}