Add undefined module warning

jiemzhang · Sep 13, 2013 · 49901bd · 49901bd
1 parent 41c9173
commit 49901bd
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/vendor/loader.js b/vendor/loader.js
@@ -100,6 +100,10 @@ define("resolver",
     if (define.registry[moduleName]) {
       module = requireModule(moduleName);
 
+      if (module === undefined) {
+        throw new Error("Module: '" + name + "' was found but returned undefined. Did you forget to `export default`?");
+      }
+
       if (typeof module.create !== 'function') {
         module = classFactory(module);
       }