AsyncRedisClient: support array of keys for del, workaround for redis-mock

- Unfortunately redis-mock currently has an open issue (yeahoffline/redis-mock#135) and an un-merged fix for it (yeahoffline/redis-mock#178) that means it doesn't support multiple arguments (i.e. spread) for the `.del()` method -> to allow using the mock library in tests add support to AsyncRedisClient for using an array of keys instead of argument-per-key and always provide the keys to the underlying redis client as an array instead of using the spread operator

Author: mikkopiu

apigw/src/shared/async-redis-client.ts

@@ -11,8 +11,14 @@ export default class AsyncRedisClient {
   async get(key: string): Promise<string | null> {
     return fromCallback<string | null>((cb) => this.client.get(key, cb))
   }
-  async del(...keys: string[]): Promise<number> {
-    return fromCallback<number>((cb) => this.client.del(...keys, cb))
+  // NOTE: redis-mock currently does not support parsing multiple arguments
+  // (see: https://github.com/yeahoffline/redis-mock/pull/178), so AsyncRedisClient
+  // should support providing the keys as an array and not use the spread
+  // operator until this is fixed upstream.
+  async del(keys: string[]): Promise<number>
+  async del(...keys: string[]): Promise<number>
+  async del(keys: string | string[]) {
+    return fromCallback<number>((cb) => this.client.del(keys, cb))
   }
   async expire(key: string, seconds: number): Promise<number> {
     return fromCallback<number>((cb) => this.client.expire(key, seconds, cb))