make cache generic

Author: nkaradzhov

packages/client/lib/client/index.ts

@@ -207,7 +207,7 @@ export default class RedisClient<
     }
   }
 
-  static #SingleEntryCache = new SingleEntryCache()
+  static #SingleEntryCache = new SingleEntryCache<any, any>()
 
   static factory<
     M extends RedisModules = {},

packages/client/lib/client/pool.ts

@@ -111,7 +111,7 @@ export class RedisClientPool<
     };
   }
 
-  static #SingleEntryCache = new SingleEntryCache();
+  static #SingleEntryCache = new SingleEntryCache<any, any>();
 
   static create<
     M extends RedisModules,

packages/client/lib/cluster/index.ts

@@ -214,7 +214,7 @@ export default class RedisCluster<
     };
   }
 
-  static #SingleEntryCache = new SingleEntryCache();
+  static #SingleEntryCache = new SingleEntryCache<any, any>();
 
   static factory<
     M extends RedisModules = {},

packages/client/lib/single-entry-cache.ts

@@ -1,19 +1,6 @@
-function makeCircularReplacer() {
-  const seen = new WeakSet();
-  return function serialize(_: string, value: any) {
-    if (value && typeof value === 'object') {
-      if (seen.has(value)) {
-        return 'circular';
-      }
-      seen.add(value);
-      return value;
-    }
-    return value;
-  }
-}
-export default class SingleEntryCache {
-  #cached?: any;
-  #key?: string;
+export default class SingleEntryCache<K, V> {
+  #cached?: V;
+  #serializedKey?: string;
 
   /**
    * Retrieves an instance from the cache based on the provided key object.
@@ -25,12 +12,26 @@ export default class SingleEntryCache {
    * This method uses JSON.stringify for comparison, which may not work correctly
    * if the properties in the key object are rearranged or reordered.
    */
-  get(keyObj?: object) {
-    return JSON.stringify(keyObj, makeCircularReplacer()) === this.#key ? this.#cached : undefined;
+  get(keyObj?: K): V | undefined {
+    return JSON.stringify(keyObj, makeCircularReplacer()) === this.#serializedKey ? this.#cached : undefined;
   }
 
-  set(keyObj: object | undefined, obj: any) {
+  set(keyObj:  K | undefined, obj: V) {
     this.#cached = obj;
-    this.#key = JSON.stringify(keyObj, makeCircularReplacer());
+    this.#serializedKey = JSON.stringify(keyObj, makeCircularReplacer());
   }
 }
+
+function makeCircularReplacer() {
+  const seen = new WeakSet();
+  return function serialize(_: string, value: any) {
+    if (value && typeof value === 'object') {
+      if (seen.has(value)) {
+        return 'circular';
+      }
+      seen.add(value);
+      return value;
+    }
+    return value;
+  }
+}