src/middleware: open router handler for developers.

src/server/middleware.js

@@ -6,12 +6,13 @@ import baseConfig from './config/webpack.config';
 import loadConfig from './config';
 import getIndexHtml from './index.html';
 import getIframeHtml from './iframe.html';
-import { getHeadHtml } from './utils';
+import { getHeadHtml, getMiddleware } from './utils';
 
 export default function (configDir) {
   // Build the webpack configuration using the `baseConfig`
   // custom `.babelrc` file and `webpack.config.js` files
   const config = loadConfig('DEVELOPMENT', baseConfig, configDir);
+  const middlewareFn = getMiddleware(configDir);
 
   // remove the leading '/'
   let publicPath = config.output.publicPath;
@@ -30,6 +31,8 @@ export default function (configDir) {
   router.use(webpackDevMiddleware(compiler, devMiddlewareOptions));
   router.use(webpackHotMiddleware(compiler));
 
+  middlewareFn(router);
+
   router.get('/', function (req, res) {
     res.send(getIndexHtml(publicPath));
   });

src/server/utils.js

@@ -24,3 +24,15 @@ export function getEnvConfig(program, configEnv) {
     }
   });
 }
+
+export function getMiddleware(configDir) {
+  const middlewarePath = path.resolve(configDir, 'middleware.js');
+  if (fs.existsSync(middlewarePath)) {
+    let middlewareModule = require(middlewarePath); // eslint-disable-line global-require
+    if (middlewareModule.__esModule) {
+      middlewareModule = middlewareModule.default;
+    }
+    return middlewareModule;
+  }
+  return function () {};
+}