Simple Webpack + babel setup

webpack.config.js

// remember to run first: npm i --save-dev webpack path babel-core babel-preset-es2015 babel-loader

/* Simplistic .babelrc file:
{
  "presets": ["es2015"]
}

*/
var path = require('path');

module.exports = {
  entry: './src/app.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'app.bundle.js'
  },
  module: {
    rules: [{
      loader: "babel-loader",
       // the loader which should be applied, it'll be resolved relative to the context
       // -loader suffix is no longer optional in webpack2 for clarity reasons
       // see webpack 1 upgrade guide

       options: {
         presets: ["es2015"]
       },
    }]
  }
}