export interface RefreshPromise<T> {
    promise: Promise<T>;
    cacheDuration: number;
}
export declare function singletonPromise<T>(rp: undefined | RefreshPromise<T>, method: () => Promise<T>, cacheDuration?: number): RefreshPromise<T>;
export declare class TimeoutError<T> extends Error {
    promise: Promise<T>;
    constructor(promise: Promise<T>);
}
export declare function timeoutPromise<T>(timeout: number, promise: Promise<T>): Promise<T>;
export declare function timeoutFunction<T>(timeout: number, f: (isTimedOut: () => boolean) => Promise<T>): Promise<T>;
export declare function createPromiseDebouncer<T>(): (func: () => Promise<T>) => Promise<T>;
export declare function createMapPromiseDebouncer<T>(): (key: any, debounce: number, func: () => Promise<T>) => Promise<T>;