webpack.config.dev.js

const webpack = require("webpack");
const path = require("path");
const R = require("ramda");
const BundleTracker = require("webpack-bundle-tracker");
const { config, babelSharedLoader } = require(
  path.resolve("./webpack.config.shared.js"),
);

const hotEntry = (host, port) =>
  `webpack-hot-middleware/client?path=http://${host}:${port}/__webpack_hmr&timeout=20000&reload=true`;

const insertHotReload = (host, port, entries) =>
  R.map(
    R.compose(R.flatten, (v) => [v].concat(hotEntry(host, port))),
    entries,
  );

const devConfig = Object.assign({}, config, {
  context: __dirname,
  mode: "development",
  devtool: "inline-source-map",
  output: {
    path: path.resolve("./static/bundles/"),
    filename: "[name].js",
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new BundleTracker({ filename: "./webpack-stats.json" }),
  ],
  optimization: {
    moduleIds: "named",
    splitChunks: {
      name: "common",
      minChunks: 2,
      automaticNameDelimiter: "-",
      cacheGroups: {
        common: {
          test: /[\\/]node_modules[\\/]/,
          name: "common",
          chunks: "all",
        },
      },
    },
  },
});

devConfig.module.rules = [
  babelSharedLoader,
  ...config.module.rules,
  {
    test: /\.css$|\.scss$/,
    use: [
      { loader: "style-loader" },
      { loader: "css-loader" },
      { loader: "postcss-loader" },
      { loader: "sass-loader" },
    ],
  },
];

const makeDevConfig = (host, port) =>
  Object.assign({}, devConfig, {
    entry: insertHotReload(host, port, devConfig.entry),
  });

module.exports = {
  makeDevConfig,
  devConfig,
};