webpack.dev.config.js

var webpack = require('webpack');
var path = require('path');

var DEV_PORT = 3824;

module.exports = {
  entry: [
    'react-hot-loader/patch',
    'webpack-dev-server/client?http://localhost:' + DEV_PORT,
    'webpack/hot/only-dev-server',
    './src/index.js'
  ],
  output: {
    path: path.join(__dirname, 'public'),
    filename: 'popup.js'
  },
  devtool: 'inline-source-map',
  devServer: {
    hot: true,
    port: DEV_PORT,
    contentBase: path.resolve(__dirname, 'extension'),
    publicPath: '/'
  },

  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        use: 'babel-loader',
        exclude: /(node_modules|bower_components)/
      },
      {
        test: /\.scss$/,
        use: ['style-loader', 'css-loader', 'postcss-loader', 'sass-loader']
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader', 'postcss-loader']
      },
      {
        test: /\.svg$/,
        loader: 'svg-react-loader',
        exclude: /(node_modules|bower_components)/
      }
    ]
  },

  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NamedModulesPlugin(),
    new webpack.NoEmitOnErrorsPlugin(),
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: '"development"'
      }
    })
  ]
};