webpack.config.js

const Webpack = require("webpack");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const CopyWebpackPlugin = require('copy-webpack-plugin')
const destination =  __dirname + "/dist";
module.exports = {
    entry: [
        "./app.js"
    ],
    output: {
        path: destination,
        filename: 'bundle.js'
    },
    devServer: {
        contentBase: './dist'
    },
    module: {
        rules: [
          {
            test: /\.(js)$/,
            exclude: /node_modules/,
            use: ['babel-loader']
          }
        ]
      },
      resolve: {
        extensions: ['*', '.js']
      },
      plugins: [
        new HtmlWebpackPlugin({
            template: './index.html',
            inject: 'body'
        }),
        new CopyWebpackPlugin([{from: 'assets', to: destination + '/assets/'}, 'data.js'])
      ]
}