a whole new webpack env

package.json

{
  "name": "qiuzhi-chrome-extension",
  "version": "1.0.0",
  "main": "webpack.config.js",
  "private": true,
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "watch": "webpack --watch",
    "start": "webpack-dev-server --open",
    "build": "webpack"
  },
  "license": "MIT",
  "devDependencies": {
    "copy-webpack-plugin": "*",
    "css-loader": "*",
    "file-loader": "*",
    "html-webpack-plugin": "*",
    "mini-css-extract-plugin": "*",
    "node-sass": "*",
    "sass-loader": "*",
    "style-loader": "*",
    "ts-loader": "*",
    "webpack": "^4.29.6",
    "webpack-cli": "^3.3.0",
    "webpack-dev-server": "^3.3.1"
  },
  "dependencies": {}
}

webpack.config.js

const path = require('path');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const HtmlWebpackPlugin = require("html-webpack-plugin");


module.exports = {
  entry: {
    show: './src/show.js',
    background: './src/background.js'
  },
  devtool: 'inline-source-map',
  devServer: {
    contentBase: './dist',
    compress: false,
    port: 8080
  },
  resolve: {
    extensions: [
      '.tsx', '.ts', '.js',
      '.scss', '.sass'
    ]
  },
  output: {
    filename: '[name].bundle.js',
    path: path.resolve(__dirname, 'dist')
  },
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        use: 'ts-loader',
        exclude: /node_modules/
      },
      {
        test: /\.(png|svg|jpg|jpeg|gif)$/,
        use: 'file-loader'
      },
      {
        test: /\.(woff|woff2|eot|ttf|otf)$/,
        use: 'file-loader'
      },
      {
        test: /\.(scss|sass)$/,
        use: [
          process.env.NODE_ENV !== 'production' ? 'style-loader' : MiniCssExtractPlugin.loader,
          {loader: "css-loader"},
          {loader: "sass-loader"}
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: 'index.html',
      minify: {
        collapseWhitespace: true,
      },
      hash: true,
    }),
    new CopyWebpackPlugin([
      {from: path.join(__dirname, 'src/index.html'), to: path.join(__dirname, 'dist/')},  // for demo
      {from: path.join(__dirname, 'src/popup.html'), to: path.join(__dirname, 'dist/')},
      {from: path.join(__dirname, 'src/manifest.json'), to: path.join(__dirname, 'dist/')},
      {from: path.join(__dirname, 'src/images/'), to: path.join(__dirname, 'dist/')},
    ]),
    new MiniCssExtractPlugin({
      filename: "[name].css",
      chunkFilename: "[id].css"
    })
  ]
};