import { AnyObject } from '@naturalcycles/js-lib';
import { TransformTyped } from '../../stream.model';
export interface TransformMultiThreadedOptions {
    /**
     * Absolute path to a js file with worker code
     */
    workerFile: string;
    /**
     * @default 2, to match CircleCI and Github Actions environments
     */
    poolSize?: number;
    /**
     * @default to poolSize
     */
    concurrency?: number;
    /**
     * @default to Math.max(16, concurrency x 2)
     */
    highWaterMark?: number;
    /**
     * Passed to the Worker as `workerData` property (initial data).
     */
    workerData?: AnyObject;
}
/**
 * Spawns a pool of Workers (threads).
 * Distributes (using round-robin, equally) all inputs over Workers.
 * Workers emit 1 output for each 1 input.
 * Output of Workers is passed down the stream. Order is RANDOM (since it's a multi-threaded environment).
 */
export declare function transformMultiThreaded<IN, OUT>(opt: TransformMultiThreadedOptions): TransformTyped<IN, OUT>;