webpack.config.js

import path from 'path';

import HtmlWebpackPlugin from 'html-webpack-plugin';

module.exports = {
  entry: path.join(__dirname, 'src', 'index.js'),
  output: {
    path: path.join(__dirname, 'build'),
    filename: 'weatapp.min.js',
    library: 'WeatApp',
    libraryTarget: 'umd',
    libraryExport: 'default',
    umdNamedDefine: true
  },
  //mode: 'production',
  mode: 'development',
  devtool: 'source-map',
  resolve: {
    modules: [path.resolve(__dirname, 'src'), 'node_modules']
  },
  devServer: {
    contentBase: path.join(__dirname, 'src')
  },
  module: {
    rules: [
      {
        // this is so that we can compile any React,
        // ES6 and above into normal ES5 syntax
        test: /\.(js|jsx)$/,
        // we do not want anything from node_modules to be compiled
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: [
              ['@babel/preset-env', {
                "targets": {
                  "browsers": "Explorer 11",
                },
                "useBuiltIns": "usage",
              }], '@babel/react']
          }
        }
      },
      {
        test: /\.(css|scss)$/,
        use: [
          "style-loader", // creates style nodes from JS strings
          "css-loader", // translates CSS into CommonJS
          "sass-loader" // compiles Sass to CSS, using Node Sass by default
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: path.join(__dirname, 'src', 'index.html')
    })
  ]
};