subprocess ref

调用 subprocess.unref() 之后再调用 subprocess.ref() 将会为子进程恢复已删除的引用计数，强迫父进程在退出自身之前等待子进程退出。

const { spawn } = require('child_process');
const subprocess = spawn(process.argv[0], ['child_program.js'], {
  detached: true,
  stdio: 'ignore'
});
subprocess.unref();
subprocess.ref();