diff --git a/packages/extensions/ws/src/index.ts b/packages/extensions/ws/src/index.ts
index 8ef2d0f4..d018ac76 100644
--- a/packages/extensions/ws/src/index.ts
+++ b/packages/extensions/ws/src/index.ts
@@ -200,14 +200,17 @@ class WebSocketExtension extends SdkExtension {
     );
 
     // browser only code start
-    if (typeof window !== "undefined" && window.addEventListener) {
-      window.addEventListener("offline", () => {
+    if (
+      typeof globalThis.window !== "undefined" &&
+      globalThis.window.addEventListener
+    ) {
+      globalThis.window.addEventListener("offline", () => {
         if (this.pingServerHandle) {
           clearTimeout(this.pingServerHandle);
         }
         this.ws?.close();
       });
-      window.addEventListener("online", () => {
+      globalThis.window.addEventListener("online", () => {
         check();
       });
     }
diff --git a/tsconfig.json b/tsconfig.json
index 6102b41c..6c2108f8 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,6 @@
 {
   "compilerOptions": {
     "esModuleInterop": true,
-    "lib": ["DOM"],
     "declaration": true,
     "sourceMap": true
   }