10天掌握webpack 4.0 优化篇 （4） IgnorePlugin

IgnorePlugin用于忽略某些特定的模块，让 webpack 不把这些指定的模块打包进去

测试例子：

src/index.js

import moment from 'moment'
moment.locale('zh-cn')
let date = moment().startOf('hour').fromNow();       // 7 分钟前
console.log(date)

打包

 包的体积差不多为 1000kib

这个时候我们测试使用    IgnorePlugin  来忽略 moment 的语言包 

const path = require('path')
let webpack = require('webpack')
let htmlWebpckPlugin = require('html-webpack-plugin')
module.exports = {
  mode: 'development',
  entry: './src/index.js',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'dist')
  },
  plugins: [
    new htmlWebpckPlugin({
      template: './public/index.html'
    }),
    new webpack.IgnorePlugin(/^./locale/, /moment$/)
  ],
  module: {
    noParse: /jquery|lodash/, // 正则表达式
    rules: [
      {
        test: /.js?$/,
        include: path.join(__dirname, 'src'),
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            "presets": [
              "@babel/preset-env",
              "@babel/preset-react",
            ]
          }
        }
      }
    ]
  },

}

　　

再次打包测试

 体积明显减少 效果明显

测试代码 ： webpack-dev-3 文件夹下

https://gitee.com/guangzhou110/ten-days_to_master_webpack4/tree/master/webpack-dev-3