exit-signal

Listen to exit signals, providing an opportunity to exit gracefully when the process is being signalled to shut down.

This module attaches listeners to SIGINT and SIGTERM. Normally when no listeners are attached, these events make the process exit immediately. This behavior changes when listeners are attached: the process will no longer exit, but instead the exit signal promise allows the process to do its own cleanup and shut itself down.

exit-signal creates a promise which resolves as soon as an exit signal is received. You can attach a then handle to this promise at any point in the lifetime of the process, even after the an exit signal is received, and the handler will be called.

The advantage of using a promise instead of a plain event handler is that your handlers won't miss an exit signal that happened before they were attached.

Installation

npm i handle-exit-signal

Usage

const handleExitSignal = require('handle-exit-signal');

const exitSignalPromise = handleExitSignal();

const server = app.listen(4000, () => {

  console.log('Server listening on port 4000');

  exitSignalPromise.then(() => {
    console.log('Server stopping listening');
    server.close();
  });
});