import { Resolvable } from './types';
/**
 * Returns a promise that will be resolved to `undefined` after given `ms` milliseconds.
 * @param ms Time delay in milliseconds.
 */
export declare function delay(ms: number): Promise<undefined>;
/**
 * Returns a promise that will first resolve the `value`, then wait for given `ms` milliseconds
 * before returning the resolved value.
 * @param ms Time delay in milliseconds.
 * @param value Value to be resolved to or a promise-like object to be fulfilled.
 */
export declare function delay<T>(ms: number, value: Resolvable<T>): Promise<T>;