webpack.config.js

const path = require('path');
const webpack = require('webpack');

/*
 * Webpack Plugins
 */
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

const ProductionPlugins = [
  // production webpack plugins go here
  new webpack.DefinePlugin({
    "process.env": {
      NODE_ENV: JSON.stringify("production")
    }
  })
]

const debug = (process.env.NODE_ENV !== 'production');
const rootAssetPath = path.join(__dirname, 'assets');

module.exports = {
  // configuration
  context: __dirname,
  entry: {
    main_js: './assets/js/main',
    main_css: [
      path.join(__dirname, 'node_modules', 'font-awesome', 'css', 'font-awesome.css'),
      path.join(__dirname, 'node_modules', 'bootstrap', 'dist', 'css', 'bootstrap.css'),
      path.join(__dirname, 'assets', 'css', 'style.css'),
    ],
  },
  mode: debug,
  output: {
    chunkFilename: "[id].js",
    filename: "[name].bundle.js",
    path: path.join(__dirname, "flask_dash_template", "static", "build"),
    publicPath: "/static/build/"
  },
  resolve: {
    extensions: [".js", ".jsx", ".css"]
  },
  devtool: debug ? "eval-source-map" : false,
  plugins: [
    new MiniCssExtractPlugin({ filename: "[name].bundle.css" }),
    new webpack.ProvidePlugin({ $: "jquery", jQuery: "jquery" })
  ].concat(debug ? [] : ProductionPlugins),
  module: {
    rules: [
      {
        test: /\.less$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
            options: {
              hmr: debug,
            },
          },
          'css-loader!less-loader',
        ],
      },
      {
        test: /\.css$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
            options: {
              hmr: debug,
            },
          },
          'css-loader',
        ],
      },
      { test: /\.html$/, loader: 'raw-loader' },
      { test: /\.woff(2)?(\?v=[0-9]\.[0-9]\.[0-9])?$/, loader: 'url-loader', options: { limit: 10000, mimetype: 'application/font-woff' } },
      {
        test: /\.(ttf|eot|svg|png|jpe?g|gif|ico)(\?.*)?$/i,
        loader: `file-loader?context=${rootAssetPath}&name=[path][name].[ext]`
      },
      { test: /\.js$/, exclude: /node_modules/, loader: 'babel-loader', query: { presets: ["@babel/preset-env"], cacheDirectory: true } },
    ],
  }
};