$ node
Welcome to Node.js v15.8.0.
Type ".help" for more information.
> process.kill(process.pid, 'SIGUSR1')
Debugger listening on ws://127.0.0.1:9229/5dea70fb-20d8-45a0-942b-a45d186fc3f5
For help, see: https://nodejs.org/en/docs/inspector
true
> (node:25150) [DEP0097] DeprecationWarning: Using a domain property in MakeCallback is deprecated. Use the async_context variant of MakeCallback or the AsyncResource class instead. (Triggered by calling on process.)
at emitMakeCallbackDeprecation (node:domain:129:13)
at process.topLevelDomainCallback (node:domain:143:5)
at process.callbackTrampoline (node:internal/async_hooks:130:14)
at REPLServer.Interface._setRawMode (node:readline:344:43)
at REPLServer.defaultEval (node:repl:521:18)
at bound (node:domain:416:15)
at REPLServer.runBound [as eval] (node:domain:427:12)
at REPLServer.onLine (node:repl:836:10)
at REPLServer.emit (node:events:390:22)
at REPLServer.EventEmitter.emit (node:domain:470:12)