chore: prefer named exports (#8315)

* chore: prefer named exports

* chore: fix import

src/button/Button.tsx

@@ -11,8 +11,8 @@ import { BORDER_SURROUND } from '../utils/constant';
 import { useRoute, routeProps } from '../composables/use-route';
 
 // Components
-import Icon from '../icon';
-import Loading, { LoadingType } from '../loading';
+import { Icon } from '../icon';
+import { Loading, LoadingType } from '../loading';
 
 const [name, bem] = createNamespace('button');
 

src/button/test/index.spec.ts

@@ -1,5 +1,5 @@
 import { mount } from '../../../test';
-import Button from '..';
+import { Button } from '..';
 
 test('should emit click event', () => {
   const wrapper = mount(Button);