export interface TaskQueEntry<I, O> {
    data: I;
    promise: {
        obj: Promise<O> | null;
        resolve: ((ret: O) => void) | null;
        reject: ((err: any) => void) | null;
    };
}
export declare class TaskQue<I, O> {
    private tasks;
    private processing;
    isEmpty(): boolean;
    add(input: I): TaskQueEntry<I, O>;
    get(): TaskQueEntry<I, O>;
    ready(task: TaskQueEntry<I, O>): void;
    private getSameTask;
    private putNewTask;
}