webpack.config.js

const webpack = require("webpack");
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
const path = require("path");

module.exports = {
  entry: {
    "imc-challenge.min": ["core-js/fn/promise", "./src/index.js"],
  },
  devtool: "source-map",
  output: {
    path: path.resolve(__dirname, "build"),
    filename: "[name].js",
    library: ["IMCChallenge"],
    libraryTarget: "var"
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: "babel-loader",
        options: {
          presets: ['@babel/preset-env']
        }
      },
      {
        test: /\.css$/,
        use: [
          {
            loader: "style-loader"
          },
          { loader: "css-loader", options: { minimize: true } }
        ]
      },
      {
        test: /\.(png|jpg|gif)$/,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: '[path][name].[ext]',
              context: ''
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new UglifyJsPlugin({
      include: /\.min\.js$/
    }),
    new BundleAnalyzerPlugin({
      analyzerMode: 'static'
    })
  ],
  watchOptions: {
    ignored: /node_modules/
  }
};