优化 bundle.js 文件大小

Question

下面是 webpack 配置代码，它的大小约为 6.2 MB。在生产模式下，它看起来需要更多时间加载登录页面 url，从第二次开始，它看起来不错，第一次出现问题，需要建议减少 bundle.js 文件大小

webpack.base.js

module.exports = {
    //Running babel to every file
    module: {
        rules: [
            {
                test: /\.js?$/,
                loader: 'babel-loader',
                exclude: /node_modules/,
                options: {
                    presets: [
                        'react',
                        'stage-0',
                        ['env', { targets: { browsers: ['last 2 versions'] } }]
                    ]
                }
            }, {
                test: /\.css$/,
                loader: "style-loader!css-loader"
            },
            {
                test: /\.less$/,
                use:[
                    {
                        loader: "style-loader"
                    },
                    {
                        loader: 'css-loader'
                    },
                    {
                        loader: "less-loader"
                    }
                ]
            }, 
            {
                test: /\.(jpe?g|png|gif|woff|woff2|eot|ttf|svg|otf)(\?[a-z0-9=.]+)?$/,
                loader: 'url-loader?limit=100000'
            }

        ]
    }//end module
}

webpack.client.js:

const config = {
    entry: './src/client/client.js',

    output: {
        filename: 'bundle.js',
        path: path.resolve(__dirname, 'public')
    }
};

module.exports = merge(baseConfig, config)

webpack.server.js:

const server_config = {
    //letting webapck know that this bundle is created for node server.
    target: 'node',

    entry: './src/server/server.js',

    output: {
        filename: 'bundle.js',
        path: path.resolve(__dirname, 'build')
    },
    externals: [webpackNodeExternals()],
    node:{
        __dirname:false
    }
};

module.exports = merge(baseConfig, server_config);

Answer 1

这是我优化 webpack 的方法。你可以查看我的完整配置here

当你想在生产环境中构建时，首先你需要运行 webpack 生产模式

webpack -p --mode=production

下面是小配置

const path = require("path");
const webpack = require("webpack");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const CompressionPlugin = require("compression-webpack-plugin");
const UglifyJsPlugin = require("uglifyjs-webpack-plugin");
const WebpackShellPlugin = require('webpack-shell-plugin');
const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");

module.exports = {
    optimization: {
        minimizer: [
            new UglifyJsPlugin({ // minify js file
                cache: true,
                parallel: true,
                sourceMap: false,
                extractComments: 'all',
                uglifyOptions: {
                    compress: true,
                    output: null
                }
            }),
            new OptimizeCSSAssetsPlugin({ // minify css
                cssProcessorOptions: {
                    safe: true,
                    discardComments: {
                        removeAll: true,
                    },
                },
            })
        ]
    },
    plugins: [
        new CompressionPlugin({ // gzip js and css 
            test: /\.(js|css)/
        }),
        new UglifyJsPlugin(), // uglify js
        new WebpackShellPlugin({
            onBuildStart: ['echo "Starting postcss command"'],
            onBuildEnd: ['postcss --dir wwwroot/dist wwwroot/dist/*.css'] // uglify css using postcss
        })
    ],
    module: {
        rules: [{
                test: /\.scss$/,
                use: [
                    'style-loader',
                    MiniCssExtractPlugin.loader,
                    {
                        loader: "css-loader",
                        options: {
                            minimize: true,
                            sourceMap: true
                        }
                    },
                    {
                        loader: "sass-loader"
                    }
                ]
            },
            {
                test: /\.(js|jsx)$/,
                exclude: /node_modules/,
                loader: ["babel-loader", "eslint-loader"]
            },
            {
                test: /\.(jpe?g|png|gif)$/i,
                loader: "file-loader"
            },
            {
                test: /\.(woff|ttf|otf|eot|woff2|svg)$/i,
                loader: "file-loader"
            }
        ]
    }
};