/**
 * util.promisify only works on browser
 *
 * @public
 */
export interface SleepTimer {
    (ms: number): Promise<void>;
    <T>(ms: number, value: T): Promise<T>;
}
/**
 * **resolve** after timeout (in miliseconds), can pass in an optional resolved value
 *
 * @public
 */
export declare const sleep: SleepTimer;
/**
 * **reject** after timeout (in miliseconds)
 *
 * By default, reject with `Error('timeout')`, but can pass in an optional rejected value
 *
 * @public
 */
export declare const timeout: (ms: number, err?: string | Error) => Promise<unknown>;
/**
 * **resolve** with given value immediately (aka. setImmediate)
 *
 * @public
 */
export declare const immediately: <T>(value?: T) => Promise<T | undefined>;
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