/// <reference types="node" />
import { WorkerOptions, MessagePort } from "worker_threads";
export declare const transferKey: unique symbol;
declare type Config<T2, R> = Partial<WorkerOptions & {
    poolSize: number;
    workerData: T2;
    transfer: (result: R) => Array<ArrayBuffer | MessagePort>;
}>;
declare type ExitCode = number;
declare type TransferResult<R> = {
    result: R;
    [transferKey]: Array<ArrayBuffer | MessagePort>;
};
export declare type Handler<T1, T2, R> = (payload?: T1, workerData?: T2) => R;
export declare type Work = (handler: Handler<any, any, any>) => void;
export declare type Task<T1, R> = {
    (payload: T1, transferList?: (ArrayBuffer | MessagePort)[]): Promise<R>;
    ref: () => void;
    unref: () => void;
    terminate: () => Promise<ExitCode[]>;
};
export declare type Spawn = (fileName: string, config?: Config<any, any>) => Task<any, any>;
export declare type Worker = <T1, T2, R>(handler: Handler<T1, T2, R>, config?: Config<T2, R>) => Task<T1, R>;
export declare type Transfer = <T1, T2, R>(handler: Handler<T1, T2, R>, mapperFn: (result: R) => Array<ArrayBuffer | MessagePort>) => (payload: T1, workerData?: T2) => TransferResult<R>;
export {};