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+<div align="center">
+  <a href="https://webpack.js.org/">
+    <img width="200" height="200" vspace="" hspace="25" src="https://cdn.rawgit.com/webpack/media/e7485eb2/logo/icon-square-big.svg">
+  </a>
+</div>
+
+[![npm][npm]][npm-url]
+[![node][node]][node-url]
+[![deps][deps]][deps-url]
+[![tests][tests]][tests-url]
+[![coverage][cover]][cover-url]
+[![chat][chat]][chat-url]
+[![size][size]][size-url]
+
+# thread-loader
+
+Runs the following loaders in a worker pool.
+
+## Getting Started
+
+```bash
+npm install --save-dev thread-loader
+```
+
+Put this loader in front of other loaders. The following loaders run in a worker pool.
+
+Loaders running in a worker pool are limited. Examples:
+
+- Loaders cannot emit files.
+- Loaders cannot use custom loader API (i. e. by plugins).
+- Loaders cannot access the webpack options.
+
+Each worker is a separate node.js process, which has an overhead of ~600ms. There is also an overhead of inter-process communication.
+
+Use this loader only for expensive operations!
+
+### Examples
+
+**webpack.config.js**
+
+```js
+module.exports = {
+  module: {
+    rules: [
+      {
+        test: /\.js$/,
+        include: path.resolve('src'),
+        use: [
+          'thread-loader',
+          // your expensive loader (e.g babel-loader)
+        ],
+      },
+    ],
+  },
+};
+```
+
+**with options**
+
+```js
+use: [
+  {
+    loader: 'thread-loader',
+    // loaders with equal options will share worker pools
+    options: {
+      // the number of spawned workers, defaults to (number of cpus - 1) or
+      // fallback to 1 when require('os').cpus() is undefined
+      workers: 2,
+
+      // number of jobs a worker processes in parallel
+      // defaults to 20
+      workerParallelJobs: 50,
+
+      // additional node.js arguments
+      workerNodeArgs: ['--max-old-space-size=1024'],
+
+      // Allow to respawn a dead worker pool
+      // respawning slows down the entire compilation
+      // and should be set to false for development
+      poolRespawn: false,
+
+      // timeout for killing the worker processes when idle
+      // defaults to 500 (ms)
+      // can be set to Infinity for watching builds to keep workers alive
+      poolTimeout: 2000,
+
+      // number of jobs the poll distributes to the workers
+      // defaults to 200
+      // decrease of less efficient but more fair distribution
+      poolParallelJobs: 50,
+
+      // name of the pool
+      // can be used to create different pools with elsewise identical options
+      name: 'my-pool',
+    },
+  },
+  // your expensive loader (e.g babel-loader)
+];
+```
+
+**prewarming**
+
+To prevent the high delay when booting workers it possible to warmup the worker pool.
+
+This boots the max number of workers in the pool and loads specified modules into the node.js module cache.
+
+```js
+const threadLoader = require('thread-loader');
+
+threadLoader.warmup(
+  {
+    // pool options, like passed to loader options
+    // must match loader options to boot the correct pool
+  },
+  [
+    // modules to load
+    // can be any module, i. e.
+    'babel-loader',
+    'babel-preset-es2015',
+    'sass-loader',
+  ]
+);
+```
+
+## Contributing
+
+Please take a moment to read our contributing guidelines if you haven't yet done so.
+
+[CONTRIBUTING](./.github/CONTRIBUTING.md)
+
+## License
+
+[MIT](./LICENSE)
+
+[npm]: https://img.shields.io/npm/v/thread-loader.svg
+[npm-url]: https://npmjs.com/package/thread-loader
+[node]: https://img.shields.io/node/v/thread-loader.svg
+[node-url]: https://nodejs.org
+[deps]: https://david-dm.org/webpack-contrib/thread-loader.svg
+[deps-url]: https://david-dm.org/webpack-contrib/thread-loader
+[tests]: https://github.com/webpack-contrib/thread-loader/workflows/thread-loader/badge.svg
+[tests-url]: https://github.com/webpack-contrib/thread-loader/actions
+[cover]: https://codecov.io/gh/webpack-contrib/thread-loader/branch/master/graph/badge.svg
+[cover-url]: https://codecov.io/gh/webpack-contrib/thread-loader
+[chat]: https://badges.gitter.im/webpack/webpack.svg
+[chat-url]: https://gitter.im/webpack/webpack
+[size]: https://packagephobia.now.sh/badge?p=thread-loader
+[size-url]: https://packagephobia.now.sh/result?p=thread-loader