How to use

removeListener

function

in

ChildProcessWithoutNullStreams

function launchTarget(...args) {
 const childProc = spawn(process.execPath, args);
 return new Promise((resolve, reject) => {
  const onExit = () => {
   reject(new Error('Child process exits unexpectly'));
  };
  childProc.on('exit', onExit);
  childProc.stderr.setEncoding('utf8');
  childProc.stderr.on('data', (data) => {
   const ret = kDebuggerMsgReg.exec(data);
   childProc.removeListener('exit', onExit);
   if (ret) {
    resolve({
     childProc,
     host: ret[1],
     port: ret[2],
    });
   }
  });
 });
}

child_process.removeListener('exit',cancelKill)

child.stdout.removeListener('data', checkOutput);
child.removeListener('exit', onChildExit);