/**
 * Delay resolution of `promise`
 *
 * @template T type that promise will yield, defaults to `void`
 * @param {Promise<T>} promise an optional promise to delay
 * @param {number} milliseconds how long to delay
 * @returns {Promise<T>} a promise that will resolve to the result of `promise`, delayed by `milliseconds`.
 */
export declare function delay<T>(promise: Promise<T>, milliseconds: number): Promise<T>;
/**
 * Return a promise that resolves after `milliseconds`.
 *
 * @param {number} milliseconds how long to delay
 * @returns {Promise<void>} a promise that will resolve to the result of `promise`, delayed by `milliseconds`.
 */
export declare function delay(milliseconds: number): Promise<void>;
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