exit

function () {}

Emitted when the process is about to exit. This is a good hook to perform constant time checks of the module’s state (like for unit tests). The main event loop will no longer be run after the ‘exit’ callback finishes, so timers may not be scheduled.

Example of listening for exit:

process.on('exit', function () {
  process.nextTick(function () {
   console.log('This will not run');
  });
  console.log('About to exit.');
});

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