webpack.config.development.js

import webpack from 'webpack';
import merge from 'webpack-merge';
import baseConfig from './webpack.config.base';

const port = process.env.PORT || 3000;

export default merge(baseConfig, {

  devtool: 'cheap-module-eval-source-map',

  entry: [
    'webpack-dev-server/client?http://localhost:3000',
    'webpack/hot/only-dev-server',
    'index.tsx'
  ],

  output: {
    publicPath: `http://localhost:${port}/dist/`
  },

  module: {
    rules: [
      {
        test: /\.global\.css$/,
        loaders: [
          'style-loader',
          'css-loader?sourceMap'
        ]
      },

      {
        test: /^((?!\.global).)*\.css$/,
        loaders: [
          'style-loader',
          'css-loader?modules&sourceMap&importLoaders=1&localIdentName=[name]__[local]___[hash:base64:5]'
        ]
      }
    ]
  },

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

  target: 'electron-renderer'
});