The test runner is stable in Node 18. If you see warnings, ensure you are using node --test without extra flags. Update Node to the latest 18.x.x patch.
: It incorporated V8 version 10.1, which brought improved performance, better memory utilization, and new JavaScript language features directly from the Google Chrome engine [17, 18, 21]. Web Streams API node 18 full
As of 2025, Node 20 is the current LTS release, and Node 22 is in development. However, for several reasons: The test runner is stable in Node 18