diff --git a/javascript/src/utils/polling.ts b/javascript/src/utils/polling.ts
index 116b3ba..08d8f6a 100644
--- a/javascript/src/utils/polling.ts
+++ b/javascript/src/utils/polling.ts
@@ -6,7 +6,8 @@ const CONNECTION_ERROR_RETRY_MAX_MS = 1000 * 60 * 10 // 10 minutes
 
 function sleep(ms: number): Promise<void> {
   return new Promise((resolve) => {
-    setTimeout(resolve, ms)
+    const timeout = setTimeout(resolve, ms)
+    timeout.unref()
   })
 }
 
diff --git a/javascript/tsconfig.json b/javascript/tsconfig.json
index 6af1a6e..746c845 100644
--- a/javascript/tsconfig.json
+++ b/javascript/tsconfig.json
@@ -11,7 +11,8 @@
     /* Additional Checks */
     "skipLibCheck": true,
     "esModuleInterop": true,
-    "allowSyntheticDefaultImports": true
+    "allowSyntheticDefaultImports": true,
+    "lib": ["ESNext"]
   },
   "ts-node": {
     // these options are overrides used only by ts-node