message: fix(CouponCell): fix discounted price
diff: // Utils
  -import { createNamespace } from '../utils';
  +import { createNamespace, isDef } from '../utils';
  import { inherit } from '../utils/functional';
  // Components
  @@ -26,7 +26,15 @@ function formatValue(props: CouponCellProps) {
  const coupon = coupons[+chosenCoupon];
  if (coupon) {
  - const value = coupon.value || coupon.denominations || 0;
  + let value = 0;
  + if (isDef(coupon.value)) {
  + ({ value } = coupon);
  + }
  +
  + if (isDef(coupon.denominations)) {
  + value = coupon.denominations!;
  + }
  +
  return `-${currency} ${(value / 100).toFixed(2)}`;
  }
  