/**
 * @param unref defaults to `false`, when true, call `unref()` on the timer.
 *            can not set to `true` on other platform (will throw "unref is not function" error).
 * @returns promise reject with TimeoutError after specific time
 */
export declare function timeout(ms: number, error?: string, boundary?: Function, unref?: boolean): Promise<never>;
/**
 * @param unref defaults to `false`, when true, call `unref()` on the timer.
 *            can not set to `true` on other platform.
 * @returns promise resolve after specific time
 */
export declare function sleep(ms: number, unref?: boolean): Promise<void>;
export declare function raceTimeout<T>(ms: number, p: PromiseLike<T>): Promise<T>;
export declare function raceTimeout<T>(ms: number, message: string, p: PromiseLike<T>): Promise<T>;
/**
 * 注意: 多次重试会并行，比如第一次重试过程中，首次发送的请求突然成功了（或失败了），那么会直接返回成功结果，第一次重试的请求即使也成功了，也会被丢弃。
 * 因此建议重试的请求本身具有幂等性（如各种数据下载请求），或者自身无超时机制（如简单的锁）。
 */
export declare function raceTimeoutWithRetry<T>(ms: number, retry: number, factory: () => Promise<T>): Promise<T>;
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