webpack.config.js

module.exports = {
    entry: "./src/main.js",
    output: {
        filename: "./dist/bundle.js"
    },
    module: {
      rules: [
        {
          test: [/\.js$/, /\.es6$/],
          exclude: /node_modules/,
          use: {
            loader: 'babel-loader',
            options: {
              presets: ['env', 'react', 'es2015']
            }
          }
        }
      ]
    },
    resolve: {
        extensions: ['.js', '.es6']
    }
};