Any hooks to subscribe to when autoupdate is about to update?

Are there any events that auto updater sends that I can hook into? Something like `autoupdate.on('about-to-update', function(){ ... })`.

**I'll explain the use case:**
My electron app prevent the app from quitting when a window closes on Mac (which is in line with how apps work on Mac).
Instead, I have a flag called `shouldQuit` and only if it's true I call app.quit().

However, this prevent the auto updater from working. When a user clicks on "Update now" when prompted, I need to be able to set the flag `shouldQuit` to `true` to allow the app to actually quit.

Couldn't find anything about it in the documentation.

Thanks!