import { Maybe } from "./maybe";
/** Asynchronous pool options  */
export interface AsyncPoolOption {
    /** Maximum concurrency limit  */
    limit?: number;
}
/** Asynchronous pool
 * Used to ensure that the number of asynchronous executions at the same time does not exceed the limit  */
export declare class AsyncPool {
    #private;
    /** @param limit Maximum concurrency limit  */
    constructor(limit?: Maybe<number>);
    /** @param option Asynchronous pool options  */
    constructor(option?: AsyncPoolOption);
    /** The number of asynchronous tasks executed in the current pool  */
    get size(): number;
    /** Run asynchronous tasks in the pool
     * Task may be delayed to start execution
    */
    run<T>(f: () => PromiseLike<T>): Promise<T>;
}