nodemon-safe-kill.js

if (process.env.NODE_ENV === 'development') {
  // This helps for nodemon to not be prematurely killed.
  // See nodemon's docs: https://github.com/remy/nodemon/blob/master/README.md#controlling-shutdown-of-your-script
  // Adapted from source: https://www.benjiegillam.com/2011/08/node-js-clean-restart-and-faster-development-with-nodemon/
  const gracefulShutdown = cb => {
    setTimeout(() => {
      process.exit(0);
      cb();
    }, 5000);
  };

  // Handle SIGUSR2, but only once.
  process.once('SIGUSR2', () => {
    // Graceful shutdown.
    gracefulShutdown(() => {
      // Kill ourself with the SIGUSR2 signal again.
      process.kill(process.pid, 'SIGUSR2');
    });
  });

  process.on('SIGTERM', () => {
    // https://expressjs.com/en/advanced/healthcheck-graceful-shutdown.html
    app.close(() => {
      // eslint-disable-next-line no-console
      console.log('Server closing. Process terminated.');
    });
  });
}