## ReconnectingWebSocket.onclose property

An event listener to be called when the WebSocket connection's readyState changes to CLOSED

**Signature:**
```typescript
onclose: ((event: CloseEvent) => void) | null;
```  
- [ReconnectingWebSocket.onclose property](/content/docs/sdk/core.reconnectingwebsocket.onclose#reconnectingwebsocketonclose-property/index.html)