Warn if the included mixin is undefined

facebook · Mar 1, 2016 · f3b9f0c · f3b9f0c
1 parent 56c423a
commit f3b9f0c
Showing 1 changed file with 14 additions and 0 deletions.
diff --git a/src/isomorphic/classic/class/ReactClass.js b/src/isomorphic/classic/class/ReactClass.js
@@ -437,6 +437,20 @@ function validateMethodOverride(isAlreadyDefined, name) {
  */
 function mixSpecIntoComponent(Constructor, spec) {
   if (!spec) {
+    if(__DEV__) {
+      var typeofSpec = typeof spec,
+          isMixinValid = typeofSpec === 'object' && spec !== null;
+
+      warning(
+        isMixinValid,
+        '%s: You\'re attempting to ' +
+        'include a mixin that is either null or not an object. ' +
+        'Expected object but got %s',
+        Constructor.displayName || 'ReactClass',
+        spec === null ? null : typeofSpec
+      );
+    }
+
     return;
   }