export declare class Deferred<T> implements PromiseLike<T> {
    resolve: (value: T | PromiseLike<T>) => void;
    reject: (reason?: any) => void;
    promise: Promise<T>;
    constructor();
    then<T1, T2 = T1>(resolve: (value: T) => T1 | PromiseLike<T1>, reject: (reason?: any) => T2 | PromiseLike<T2>): Promise<T1 | T2>;
}