webpack.config.js

const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CopyPlugin = require('copy-webpack-plugin');

module.exports = {
  entry: {
    app: path.join(__dirname, 'src', 'index.js'),
  },
  output: {
    path: path.join(__dirname, 'docs'),
    filename: '[name].js'
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: 'raw-loader'
      },
      {
        test: /\.js$/,
        exclude: /(node_modules)/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env'],
            plugins: [],
          }
        }
      }
    ]
  },
  plugins: [
    new CopyPlugin([
      {
        from: path.resolve('src', 'index.html'),
        to: 'index.html',
        force: true
      }
    ]),
    new webpack.ProgressPlugin(),
    new webpack.HotModuleReplacementPlugin(),
    new HtmlWebpackPlugin({ template: path.join(__dirname, 'src', 'index.html') })
  ]
};