import EventEmitter from 'events';

type QueueHandlerFunction = (a: any) => Promise<any>;
interface QueueConstructorOptions {
    handler: QueueHandlerFunction;
}
declare class Queue extends EventEmitter {
    private handler;
    private fifo;
    private running;
    private inProgress;
    private stopping;
    constructor(opts: QueueConstructorOptions);
    enqueue(task: any): Promise<any>;
    stop(): Promise<void>;
    private dequeue;
    private run;
}

export { Queue };