turn webpack middleware into middleware

fix HMR middleware, and some loopback boilerplate cleanup

server/middleware/helpers/webpack.js

@@ -0,0 +1,9 @@
+const webpack = require('webpack');
+const config = require('../../config/webpack.dev');
+
+const compiler = webpack(config);
+
+module.exports = {
+  compiler,
+  config,
+};

server/middleware/webpack-dev.js

@@ -0,0 +1,23 @@
+const webpackMiddleware = require('webpack-dev-middleware');
+const webpack = require('./helpers/webpack');
+
+const isProduction = (process.env.NODE_ENV === 'production');
+
+module.exports = (params) => {
+  if (isProduction || params.enabled !== true) return (req, res, next) => next();
+
+  const middleware = webpackMiddleware(webpack.compiler, {
+    publicPath: webpack.config.output.publicPath,
+    contentBase: 'src',
+    stats: {
+      colors: true,
+      hash: false,
+      timings: true,
+      chunks: false,
+      chunkModules: false,
+      modules: false,
+    },
+  });
+
+  return (req, res, next) => middleware(req, res, next);
+};

server/middleware/webpack-hmr.js

@@ -0,0 +1,12 @@
+const webpackHotMiddleware = require('webpack-hot-middleware');
+const webpack = require('./helpers/webpack');
+
+const isProduction = (process.env.NODE_ENV === 'production');
+
+module.exports = (params) => {
+  if (isProduction || params.enabled !== true) return (req, res, next) => next();
+
+  const middleware = webpackHotMiddleware(webpack.compiler);
+
+  return (req, res, next) => middleware(req, res, next);
+};