fix(runtime-core): support object syntax for class (#215)

packages/vue/__tests__/index.spec.ts

@@ -13,3 +13,19 @@ it('should support on-the-fly template compilation', () => {
   createApp().mount(App, container)
   expect(container.innerHTML).toBe(`0`)
 })
+
+it('should correctly normalize class with on-the-fly template compilation', () => {
+  const container = document.createElement('div')
+  const App = {
+    template: `<div :class="{ test: demoValue, test2: !demoValue }"></div>`,
+    data() {
+      return {
+        demoValue: true
+      }
+    }
+  }
+  createApp().mount(App, container)
+  const classes = container.firstElementChild!.classList
+  expect(classes.contains('test')).toBe(true)
+  expect(classes.contains('test2')).toBe(false)
+})