webpack-merge提供了一个merge连接数组并合并创建新对象的对象的函数。如果遇到函数，它将执行它们，通过算法运行结果，然后再次将返回的值包装在函数中。
这种行为在配置webpack时特别有用，尽管它有超出它的用途。无论何时需要合并配置对象，webpack-merge都可以派上用场.
栗子:
1 const devWebpackConfig = merge(baseWebpackConfig, { 2 module: { 3 rules: utils.styleLoaders({ sourceMap: config.dev.cssSourceMap, usePostCSS: true }) 4 }, 5 // cheap-module-eval-source-map is faster for development 6 devtool: config.dev.devtool, 7 8 // these devServer options should be customized in /config/index.js 9 devServer: {10 clientLogLevel: 'warning',11 historyApiFallback: {12 rewrites: [13 { from: /.*/, to: path.posix.join(config.dev.assetsPublicPath, 'index.html') },14 ],15 },16 hot: true,17 contentBase: false, // since we use CopyWebpackPlugin.18 compress: true,19 host: HOST || config.dev.host,20 port: PORT || config.dev.port,21 open: config.dev.autoOpenBrowser,22 overlay: config.dev.errorOverlay23 ? { warnings: false, errors: true }24 : false,25 publicPath: config.dev.assetsPublicPath,26 proxy: config.dev.proxyTable,27 quiet: true, // necessary for FriendlyErrorsPlugin28 watchOptions: {29 poll: config.dev.poll,30 }31 },32 plugins: [33 new webpack.DefinePlugin({34 'process.env': require('../config/dev.env')35 }),36 new webpack.HotModuleReplacementPlugin(),37 new webpack.NamedModulesPlugin(), // HMR shows correct file names in console on update.38 new webpack.NoEmitOnErrorsPlugin(),39 // https://github.com/ampedandwired/html-webpack-plugin40 new HtmlWebpackPlugin({41 filename: 'index.html',42 template: 'index.html',43 inject: true44 }),45 // copy custom static assets46 new CopyWebpackPlugin([47 {48 from: path.resolve(__dirname, '../static'),49 to: config.dev.assetsSubDirectory,50 ignore: ['.*']51 }52 ])53 ]54 })
使用：
