Fix using Express middleware with a config file which exports a function

Fixes #238

CHANGES.md

@@ -1,3 +1,7 @@
+**Fixed:**
+
+- Fix using Express middleware with a config file which exports a function [[#238](https://github.com/insin/nwb/issues/238)]
+
 # 0.14.1 / 2017-01-13
 
 **Fixed:**

src/expressMiddleware.js

@@ -25,7 +25,9 @@ export default function nwbMiddleware(express, options = {}) {
     'The express module must be passed as the first argument to nwb middleware'
   )
 
-  let userConfig = getUserConfig({config: options.config}, {required: true})
+  // We need to do an intial grab of the user config to determine the project
+  // type.
+  let userConfig = getUserConfig({_: ['serve'], config: options.config}, {required: true})
   if (!SERVE_APP_CONFIG[userConfig.type]) {
     throw new Error(
       `nwb Express middleware is unable to serve anything for a ${userConfig.type} project.`

tests/fixtures/projects/express-middleware/nwb.config.js

@@ -1,3 +1,5 @@
-module.exports = {
-  type: 'react-app'
+module.exports = function() {
+  return {
+    type: 'react-app'
+  }
 }