type Iterable<T, ReturnType> = (item: T, index: number) => Promise<ReturnType> | ReturnType;
export declare function mapSeries<T = unknown, ReturnType = unknown>(data: T[], fn: Iterable<T, ReturnType>): Promise<ReturnType[]>;
export declare function mapParallel<T = unknown, ReturnType = unknown>(data: T[], fn: Iterable<T, ReturnType>): Promise<ReturnType[]>;
export declare function nextTick<FN extends (...args: Array<unknown>) => any>(fn?: FN): Promise<ReturnType<FN>>;
export {};