Warn if the included mixin is undefined

facebook · Mar 1, 2016 · d2407c7 · d2407c7
1 parent 56c423a
commit d2407c7
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/isomorphic/classic/class/ReactClass.js b/src/isomorphic/classic/class/ReactClass.js
@@ -437,6 +437,12 @@ function validateMethodOverride(isAlreadyDefined, name) {
  */
 function mixSpecIntoComponent(Constructor, spec) {
   if (!spec) {
+    warning(
+      typeof spec === 'undefined',
+      '%s: You\'re attempting to ' +
+      'include a mixin that is undefined.',
+      Constructor.displayName || 'ReactClass'
+    );
     return;
   }