DX-2265: add Requester type declaration

examples/vercel-functions-app-router/app/api/custom-requester/route.ts

@@ -0,0 +1,25 @@
+import { Redis, Requester, UpstashResponse } from "@upstash/redis";
+
+/**
+ * it's possible to create a Redis client with a custom requester
+ * implementation. This can be useful if you want to modify the
+ * request/response behavior, add custom logging, or integrate with
+ * other libraries.
+ * 
+ * In this example, we create a simple custom requester that logs
+ * the request options and returns a mock response.
+ */
+
+const requester = {
+  request: async (opts) => {
+    console.log("Custom requester called with:", opts);
+    return { result: "custom response" } as UpstashResponse<any>;
+  },
+} satisfies Requester
+
+const redis = new Redis(requester)
+
+export async function GET() {
+  const response = await redis.get("mykey");
+  return new Response(JSON.stringify({ response }));
+}

platforms/nodejs.ts

@@ -78,6 +78,11 @@ export class Redis extends core.Redis {
    */
   constructor(config: RedisConfigNodejs);
 
+  /**
+   * Create a new redis client by providing a custom `Requester` implementation
+   */
+  constructor(requester: Requester);
+
   /**
    * Create a new redis client by providing a custom `Requester` implementation
    *