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48 lines
2.1 KiB
48 lines
2.1 KiB
3 years ago
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/**
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* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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/// <reference types="node" />
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import type { FarmOptions, PoolExitResult, PromiseWithCustomMessage } from './types';
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export { default as messageParent } from './workers/messageParent';
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/**
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* The Jest farm (publicly called "Worker") is a class that allows you to queue
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* methods across multiple child processes, in order to parallelize work. This
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* is done by providing an absolute path to a module that will be loaded on each
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* of the child processes, and bridged to the main process.
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*
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* Bridged methods are specified by using the "exposedMethods" property of the
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* "options" object. This is an array of strings, where each of them corresponds
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* to the exported name in the loaded module.
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*
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* You can also control the amount of workers by using the "numWorkers" property
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* of the "options" object, and the settings passed to fork the process through
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* the "forkOptions" property. The amount of workers defaults to the amount of
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* CPUS minus one.
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*
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* Queueing calls can be done in two ways:
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* - Standard method: calls will be redirected to the first available worker,
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* so they will get executed as soon as they can.
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*
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* - Sticky method: if a "computeWorkerKey" method is provided within the
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* config, the resulting string of this method will be used as a key.
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* Every time this key is returned, it is guaranteed that your job will be
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* processed by the same worker. This is specially useful if your workers
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* are caching results.
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*/
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export default class JestWorker {
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private _ending;
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private _farm;
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private _options;
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private _workerPool;
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constructor(workerPath: string, options?: FarmOptions);
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private _bindExposedWorkerMethods;
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private _callFunctionWithArgs;
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getStderr(): NodeJS.ReadableStream;
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getStdout(): NodeJS.ReadableStream;
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end(): Promise<PoolExitResult>;
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}
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export type { PromiseWithCustomMessage };
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