add server to monorepo.

packages/server/src/api/middleware/AsyncRenderMiddleware.ts

@@ -0,0 +1,23 @@
+import { Request, Response } from 'express';
+
+const asyncRender = (app) => (path: string, attributes = {}) =>
+  new Promise((resolve, reject) => {
+    app.render(path, attributes, (error, data) => {
+      if (error) { reject(error); }
+
+      resolve(data);
+    });
+  });
+
+/**
+ * Injects `asyncRender` method to response object.
+ * @param {Request} req Express req Object
+ * @param {Response} res  Express res Object
+ * @param {NextFunction} next  Express next Function
+ */
+const asyncRenderMiddleware = (req: Request, res: Response, next: Function) => {
+  res.asyncRender = asyncRender(req.app);
+  next();
+};
+
+export default asyncRenderMiddleware;