Node SDKs

The LiveKit Node SDKs shifted focus toward stability and resource management. The rtc-node package shipped fixes for memory and file descriptor leaks in stream handling and native bindings, including proper cleanup of AudioResampler instances and reader locks on completion. The server SDK added a ringingTimeout option for SIP participant transfers, while the client library expanded frame processor support with userdata propagation through resampling pipelines and type guards to avoid dual package hazard issues.