webpack.config.dev.js

import webpack from 'webpack';
import HtmlWebpackPlugin from 'html-webpack-plugin';
import autoprefixer from 'autoprefixer';
import path from 'path';
import DashboardPlugin from 'webpack-dashboard/plugin';

export default {
  resolve: {
    extensions: ['*', '.js', '.jsx', '.json']
  },
  devtool: 'eval-source-map', // more info:https://webpack.github.io/docs/build-performance.html#sourcemaps and https://webpack.github.io/docs/configuration.html#devtool
  entry: [
    // must be first entry to properly set public path
    './src/webpack-public-path',
    'react-hot-loader/patch',
    'webpack-hot-middleware/client?reload=true',
    path.resolve(__dirname, 'src/index.js') // Defining path seems necessary for this to work consistently on Windows machines.
  ],
  target: 'web', // necessary per https://webpack.github.io/docs/testing.html#compile-and-test
  output: {
    path: path.resolve(__dirname, 'dist'), // Note: Physical files are only output by the production build task `npm run build`.
    publicPath: '/',
    filename: 'bundle.js'
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('development'), // Tells React to build in either dev or prod modes. https://facebook.github.io/react/downloads.html (See bottom)
      __DEV__: true
    }),
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoEmitOnErrorsPlugin(),
    new HtmlWebpackPlugin({     // Create HTML file that includes references to bundled CSS and JS.
      template: 'src/index.html',
      favicon: 'src/favicon.ico',
      minify: {
        removeComments: true,
        collapseWhitespace: true
      },
      inject: true
    }),
    new webpack.LoaderOptionsPlugin({
      minimize: false,
      debug: true,
      noInfo: true, // set to false to see a list of every file being bundled.
      options: {
        sassLoader: {
          includePaths: [path.resolve(__dirname, 'src', 'scss')]
        },
        context: '/',
        postcss: () => [autoprefixer],
      }      
    }),
    new DashboardPlugin()
  ],
  module: {
    rules: [
      {test: /\.jsx?$/, exclude: /node_modules/, loaders: ['babel-loader']},
      {test: /\.eot(\?v=\d+.\d+.\d+)?$/, loader: 'file-loader'},
      {test: /\.woff(2)?(\?v=[0-9]\.[0-9]\.[0-9])?$/, loader: 'url-loader?limit=10000&mimetype=application/font-woff'},
      {test: /\.[ot]tf(\?v=\d+.\d+.\d+)?$/, loader: 'url-loader?limit=10000&mimetype=application/octet-stream'},
      {test: /\.svg(\?v=\d+\.\d+\.\d+)?$/, loader: 'url-loader?limit=10000&mimetype=image/svg+xml'},
      {test: /\.(jpe?g|png|gif)$/i, loader: 'file-loader?name=[name].[ext]'},
      { test: /\.ico$/, loader: 'file-loader?name=[name].[ext]' },
      {
          test: /\.(scss|css)$/,
          loaders: [
              'style-loader?sourceMap',
              'css-loader?modules&importLoaders=1&localIdentName=[path]___[name]__[local]___[hash:base64:5]',
              'sass-loader?sourceMap'
          ]
      }
    ]
  }
};