set up babel and webpack for es6 code example

Example 1: configure webpack with babel

module: {
  rules: [
    {
      test: /\.m?js$/,
      exclude: /(node_modules|bower_components)/,
      use: {
        loader: 'babel-loader',
        options: {
          presets: ['@babel/preset-env']
        }
      }
    }
  ]
}

Example 2: babel and webpack

yarn add --dev webpack @babel/core babel-loader @babel/preset-env node-sass css-loader sass-loader style-loader postcss-loader autoprefixer