type InternalQueueFn = () => Promise<void>;
type AnyFn = (...args: any[]) => any;
export declare class Queue<TQueueFunction extends AnyFn = AnyFn> {
    protected running: boolean;
    protected queue: InternalQueueFn[];
    protected timeout: number;
    constructor(timeout?: number);
    add(fn: TQueueFunction): Promise<void>;
    next(): void;
    clear(): void;
}
export {};