webpack js压缩 css分离

原本想按照网上的一些教程去做的, 但是, webpack4.0 去除掉了默认的js压缩插件, 或者说, 名字改掉了

我的优化方法如下（还可以再优化，后面再更新）:

webpack4.0 以前的版本可以直接用: extract-text-webpack-plugin

webpack4.0之后的版本要加上: extract-text-webpack-plugin@next

extract-text-webpack-plugin :
某类型文件( 如: .less/.sass/.css)合并成一个文件 , 并从js分离

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
// const  webpackUglifyJsPlugin = require('uglify-js-plugin');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const extractLESS = new ExtractTextPlugin('stylesheets/[name]-two.css');
const extractCSS = new ExtractTextPlugin('stylesheets/[name]-one.css');
module.exports = {
    entry: [
        'babel-polyfill', path.resolve(__dirname, 'src/index.js')
    ],
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: 'bundle.js'
    },
    module: {
        rules: [
            {
                test: /\.(js|jsx)$/i,
                use: [
                    {
                        loader: 'babel-loader',
                        options: {
                            "presets": ["env", "react", "stage-2"]
                        }
                    }
                ],
                exclude: /node_modules/
            }, {
                test: /\.css$/i,
                use: extractCSS.extract({
                    fallback: 'style-loader',
                    use: ['css-loader']
                  })
            }, {
                test: /\.less$/i,
                use: extractLESS.extract({
                    fallback: 'style-loader',
                    use: ['css-loader', 'less-loader']
                  })
            }
        ]
    },
    resolve: {
        extensions: ['.js', '.jsx']
    },
    plugins: [
        new HtmlWebpackPlugin({title: 'manage', filename: "index.html", inject: 'body'}),
        new UglifyJsPlugin({
            parallel: 4,
            uglifyOptions: {
                output: {
                    comments: false,
                    beautify: false
                },
                compress: {},
                warnings: false
            },
            cache: true
        }),
        extractLESS,
        extractCSS
    ]
};