types: test cases typing

src/pull-refresh/index.tsx

@@ -31,7 +31,7 @@ export default createComponent({
     loadingText: String,
     modelValue: {
       type: Boolean,
-      required: true,
+      default: false,
     },
     successDuration: {
       type: [Number, String],

src/pull-refresh/test/index.spec.ts

@@ -148,5 +148,5 @@ test('should set height when using head-height', async () => {
     },
   });
   const head = wrapper.find('.van-pull-refresh__head');
-  expect(head.element.style.height).toEqual('100px');
+  expect(head.style.height).toEqual('100px');
 });