feat(sdk-js): add support for registering multiple events at once

libs/sdk-js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@langchain/langgraph-sdk",
-  "version": "0.0.64",
+  "version": "0.0.65",
   "description": "Client library for interacting with the LangGraph API",
   "type": "module",
   "packageManager": "yarn@1.22.19",

libs/sdk-js/src/auth/index.ts

@@ -27,7 +27,11 @@ export class Auth<
 
   on<T extends CallbackEvent>(event: T, callback: OnCallback<T, TUser>): this {
     this["~handlerCache"].callbacks ??= {};
-    this["~handlerCache"].callbacks[event as string] = callback as AnyCallback;
+    const events = Array.isArray(event) ? event : [event];
+    for (const event of events) {
+      this["~handlerCache"].callbacks[event as string] =
+        callback as AnyCallback;
+    }
     return this;
   }
 }