/**
 * The `DeferredPromise` class provides a mechanism for resolving a promise from outside
 * its executor function.
 */
export declare class DeferredPromise<T> implements Promise<T> {
    resolve: (value: T) => void;
    reject: (err?: any) => void;
    private readonly promise;
    [Symbol.toStringTag]: string;
    constructor();
    then<TResult1 = T, TResult2 = never>(onfulfilled?: ((value: T) => TResult1 | PromiseLike<TResult1>) | undefined | null, onrejected?: ((reason: any) => TResult2 | PromiseLike<TResult2>) | undefined | null): Promise<TResult1 | TResult2>;
    catch<TResult = never>(onrejected?: ((reason: any) => TResult | PromiseLike<TResult>) | undefined | null): Promise<T | TResult>;
    finally(onfinally?: (() => void) | undefined | null): Promise<T>;
}