import { AsyncFunction } from "../types";
/**
 * limit concurrent for parallel operations
 *
 * @category Async
 * @since 5.15.0
 * @param runner async operation function
 * @param concurrencyNumber max concurrency number
 *
 * @returns the concurrency limited function wrapper
 *
 */
export declare function limit<T extends AsyncFunction>(runner: T, concurrencyNumber: number): T;
/**
 * let async function only invoke at once in same time
 *
 * @category Async
 * @since 5.20.0
 * @param func the function to be processed
 * @returns the wrapped function instance
 */
export declare function synchronized<T extends AsyncFunction>(func: T): T;
export default limit;