import { AsyncFunction } from './timeOut';
declare global {
    interface Promise<T> {
        /**
         * Call the async function with time out limit.
         *
         * @param {AsyncFunction<U>} asyncFunction
         * - an async function
         *
         * @param {number} [millisecond=1000]
         * - the time limit for the time out
         *
         * @return {Promise<U> | Promise<never>}
         * The returned promise
         *
         * @example
         * Promise.resolve('a')
         *   .timeOut(asyncFunction, 300)
         *   .then(doSomething)
         * // return a promise after with in 300 ms, otherwise reject with time out error
         */
        timeOut<U>(asyncFunction: AsyncFunction<U>, millisecond?: number): Promise<U> | Promise<never>;
        /**
         * Return the promise with time out limit.
         *
         * @param {Promise<U>} promise
         * - a promise
         *
         * @param {number} [millisecond=1000]
         * - the time limit for the time out
         *
         * @return {Promise<U> | Promise<never>}
         * The returned promise
         *
         * @example
         * Promise.resolve('a')
         *   .timeOut(promise, 300)
         *   .then(doSomething)
         * // return a promise after with in 300 ms, otherwise reject with time out error
         */
        timeOut<U>(promise: Promise<U>, millisecond?: number): Promise<U> | Promise<never>;
    }
}