webpack.config.dev.js

import webpack from "webpack";
import HtmlWebpackPlugin from "html-webpack-plugin";
import autoprefixer from "autoprefixer";
import path from "path";

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",
    "babel-polyfill",
    "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.ejs",
      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]
      }
    })
  ],
  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$/, loader: 'file-loader?name=[name].[ext]' },
      { test: /(\.css|\.less)$/, loaders: ['style-loader', 'css-loader?sourceMap', 'postcss-loader', 'less-loader?sourceMap'] }
    ]
  }
};