在工作池中运行指定的加载器。
npm install --save-dev thread-loader
或
yarn add -D thread-loader
或
pnpm add -D thread-loader
将此加载器置于其他加载器之前。以下加载器将在工作池中运行。
在工作池中运行的加载器有其限制。例如
每个工作进程都是一个独立的 Node.js 进程,其开销约为 600 毫秒。此外,进程间通信也会带来额外的开销。
仅将此加载器用于开销大的操作!
webpack.config.js
module.exports = {
module: {
rules: [
{
test: /\.js$/,
include: path.resolve('src'),
use: [
'thread-loader',
// your expensive loader (e.g babel-loader)
],
},
],
},
};
带选项
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 pool distributes to the workers
// defaults to 200
// decrease for less efficient but more fair distribution
poolParallelJobs: 50,
// name of the pool
// can be used to create different pools with otherwise identical options
name: 'my-pool',
},
},
// your expensive loader (e.g babel-loader)
];
预热
为了避免启动工作进程时的高延迟,可以预热工作池。
这将启动池中最大数量的工作进程,并将指定的模块加载到 Node.js 模块缓存中。
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-env',
'sass-loader',
],
);
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