refactor(LOY-62): implement code review feedback

constants/membershipLevels.ts

@@ -18,10 +18,14 @@ export enum MembershipLevelEnum {
   L7 = "L7",
 }
 
-export function isMembershipLevel(value: string): value is MembershipLevelEnum {
-  return Object.values(MembershipLevelEnum).includes(
-    value as MembershipLevelEnum
-  )
+export const TIER_TO_FRIEND_MAP: Record<MembershipLevelEnum, string> = {
+  [MembershipLevelEnum.L1]: "New Friend",
+  [MembershipLevelEnum.L2]: "Good Friend",
+  [MembershipLevelEnum.L3]: "Close Friend",
+  [MembershipLevelEnum.L4]: "Dear Friend",
+  [MembershipLevelEnum.L5]: "Loyal Friend",
+  [MembershipLevelEnum.L6]: "True Friend",
+  [MembershipLevelEnum.L7]: "Best Friend",
 }
 
 export type MembershipLevel = keyof typeof MembershipLevelEnum

constants/rewards.ts

@@ -37,3 +37,9 @@ export const RESTAURANT_REWARD_IDS = [
   REWARD_IDS.FreeKidsDrink,
   REWARD_IDS.FreeBreakfast,
 ] as const
+
+export const COUPON_REWARD_TYPES = [
+  "Surprise",
+  "Campaign",
+  "Member-voucher",
+] as const