webpack.dev.config.js

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

const dist = 'dist/';

module.exports = {
  entry: [
    'webpack-dev-server/client?http://127.0.0.1:3000/',
    'webpack/hot/only-dev-server',
    './src/index',
  ],
  output: {
    path: path.join(__dirname, dist),
    publicPath: 'http://127.0.0.1:3000/',
    contentBase: dist,
    filename: 'bundle.js',
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/,
      },
      {
        test: /\.jsx$/,
        loaders: ['react-hot', 'babel-loader'],
        exclude: /node_modules/,
      },
      {
        test: /\.s(a|c)ss$/,
        loaders: ['style', 'css', 'sass'],
      },
      {
        test: /\.css$/,
        loaders: ['style', 'css'],
      },
      {
        test: /\.json$/,
        loader: 'json',
      },
    ],
  },
  resolve: {
    extensions: ['', '.js', '.jsx'],
    modulesDirectories: ['node_modules'],
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
  ],
};