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jest-worker

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jest-worker

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What is jest-worker?

The jest-worker npm package is a module designed to make it easy to move heavy processing tasks to child processes, thus enabling better use of multi-core systems and improving the performance of Node.js applications. It is primarily used to parallelize work across processes and manage communication between the main thread and worker threads.

What are jest-worker's main functionalities?

Creating a Worker Pool

This feature allows you to create a pool of workers that can execute functions from a specified module file. The 'heavyTask.js' module would export the functions that you want to run on separate threads.

const { Worker } = require('jest-worker');
const worker = new Worker(require.resolve('./heavyTask.js'));
const result = await worker.myHeavyTask(args);

Sending and Receiving Data

With jest-worker, you can send data to worker threads for processing and receive the processed data back in the main thread. The 'dataProcessor.js' module would contain the 'processData' function that handles the data processing logic.

const { Worker } = require('jest-worker');
const worker = new Worker(require.resolve('./dataProcessor.js'));
const processedData = await worker.processData(rawData);

Ending Worker Processes

This feature allows you to properly shut down the worker processes once you're done with them, freeing up system resources.

const { Worker } = require('jest-worker');
const worker = new Worker(require.resolve('./task.js'));
// ... use the worker
await worker.end();

Other packages similar to jest-worker

    workerpool

    The 'workerpool' package is similar to 'jest-worker' in that it also allows you to offload tasks to a pool of workers. It provides a different API and additional features like timeouts and the ability to cancel tasks.

    threads

    The 'threads' package is another alternative that offers a high-level abstraction for working with Web Workers or Node's Worker Threads. It has a different API design and supports transferable objects for efficient data transfer.

    tiny-worker

    The 'tiny-worker' package is a minimalistic implementation of the Web Workers API for Node.js. It is lightweight and simple to use but does not offer the same level of functionality or control over worker management as 'jest-worker'.

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Package last updated on 03 Oct 2017

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