chore: prefer named exports (#8315)

* chore: prefer named exports

* chore: fix import

src/coupon/Coupon.tsx

@@ -1,7 +1,7 @@
 import { computed, PropType, defineComponent } from 'vue';
 import { padZero, createNamespace } from '../utils';
 import { RED } from '../utils/constant';
-import Checkbox from '../checkbox';
+import { Checkbox } from '../checkbox';
 
 export type CouponInfo = {
   id: string | number;

src/coupon/test/index.spec.ts

@@ -1,5 +1,5 @@
 import { mount } from '../../../test';
-import Coupon from '..';
+import { Coupon } from '..';
 
 const coupon = {
   id: 1,