webpack 4 - webpack-merge to config dev prod environment quickly

[hsipeng]

webpack4 config-5

webpack-merge

• webpack.common.js

var path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const CleanWebpackPlugin = require("clean-webpack-plugin");

module.exports = {
  mode: "production",
  entry: {
    app: "./src/index.js"
  },
  devtool: "inline-source-map",
  devServer: {
    contentBase: "./dist",
    hot: true
  },
  output: {
    path: path.resolve(__dirname, "dist"),
    filename: "[name].bundle.js"
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ["style-loader", "css-loader"]
      },
      {
        test: /\.(png|svg|jpg|gif)$/,
        use: ["file-loader"]
      }
    ]
  },
  plugins: [
    new CleanWebpackPlugin(["dist"]),
    new HtmlWebpackPlugin({
      title: "Production"
    })
  ]
};

use webpack-merge get dev and prod config

• webpack.dev.js

const merge = require("webpack-merge");
const common = require("./webpack.common.js");
const webpack = require("webpack");

module.exports = merge(common, {
  devtool: "inline-source-map",
  devServer: {
    contentBase: "./dist",
    hot: true
  },
  plugins: [
    new webpack.NamedModulesPlugin(),
    new webpack.HotModuleReplacementPlugin(),
    new webpack.DefinePlugin({
      "process.env.NODE_ENV": JSON.stringify("development")
    })
  ]
});

• webpack.prod.js

const merge = require("webpack-merge");
const UglifyJSPlugin = require("uglifyjs-webpack-plugin");
const common = require("./webpack.common.js");
const webpack = require("webpack");

module.exports = merge(common, {
  devtool: "source-map",
  plugins: [
    new UglifyJSPlugin({
      sourceMap: true
    }),
    new webpack.DefinePlugin({
      "process.env.NODE_ENV": JSON.stringify("production")
    })
  ]
});