webpack.config.js

const path = require('path')
const ExtractTextPlugin = require('extract-text-webpack-plugin')
const UglifyJSPlugin = require('uglifyjs-webpack-plugin')

module.exports = {
  context: path.resolve(__dirname, './src'),
  entry: './js/index.js',
  output: {
    path: path.resolve(__dirname, './dist'),
    filename: 'bundle.js'
  },
  resolve: {
    extensions: ['.js', '.jsx']
  },
  module: {
    rules: [
      {
        enforce: 'pre',
        test: /\.(js|jsx)$/,
        exclude: '/node_modules',
        use: ['eslint-loader']

      },
      {
        test: /\.(js|jsx)$/,
        exclude: '/node_modules',
        use: ['babel-loader']
      },
      {
        test: /\.scss$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: ['css-loader', 'postcss-loader', 'sass-loader']
        })
      }
    ]
  },
  devServer: {
    contentBase: path.resolve(__dirname, './dist'),
    compress: true,
    port: 8080
  },
  plugins: [
    new ExtractTextPlugin('style.bundle.css'),
    new UglifyJSPlugin({
      compress: { warnings: false }
    })
  ]
}