add assertions that prevent reopening on native classes

emberjs · Jan 28, 2018 · 8b91e86 · 8b91e86
1 parent 36b8034
commit 8b91e86
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/packages/ember-runtime/lib/system/core_object.js b/packages/ember-runtime/lib/system/core_object.js
@@ -835,6 +835,7 @@ let ClassMixinProps = {
     @public
   */
   reopen() {
+    assert(`You cannot reopen ${this} because it was defined with native class syntax`, this.hasOwnProperty('PrototypeMixin'));
     this.willReopen();
     reopen.apply(this.PrototypeMixin, arguments);
     return this;
@@ -902,6 +903,7 @@ let ClassMixinProps = {
     @public
   */
   reopenClass() {
+    assert(`You cannot reopen ${this} because it was defined with native class syntax`, this.hasOwnProperty('ClassMixin'));
     reopen.apply(this.ClassMixin, arguments);
     applyMixin(this, arguments, false);
     return this;