fix: make __ob__ unenumerable (vuejs#149)

* fix: make __ob__ unenumerable

Author: pigwang

src/reactivity/reactive.ts

@@ -152,7 +152,7 @@ export function nonReactive<T = any>(obj: T): T {
   }
 
   // set the vue observable flag at obj
-  (obj as any).__ob__ = (observe({}) as any).__ob__;
+  def(obj, '__ob__', (observe({}) as any).__ob__);
   // mark as nonReactive
   def(obj, NonReactiveIdentifierKey, NonReactiveIdentifier);
 

test/setup.spec.js

@@ -276,6 +276,24 @@ describe('setup', () => {
       .then(done);
   });
 
+  it("should put a unenumerable '__ob__' for non-reactive object", () => {
+    const clone = obj => JSON.parse(JSON.stringify(obj));
+    const componentSetup = jest.fn(props => {
+      const internalOptions = clone(props.options);
+      return { internalOptions };
+    });
+    const ExternalComponent = {
+      props: ['options'],
+      setup: componentSetup,
+    };
+    new Vue({
+      components: { ExternalComponent },
+      setup: () => ({ options: {} }),
+      template: `<external-component :options="options"></external-component>`,
+    }).$mount();
+    expect(componentSetup).toReturn();
+  });
+
   it('current vue should exist in nested setup call', () => {
     const spy = jest.fn();
     new Vue({