How to track the full screen mode of the map?

Question

JavaScript

Please tell me with the help of which design you can track the inclusion and deactivation of the full-screen mode of the map. I searched here but didn't see anything useful.

Answer 1

Have you looked here ? - events fullscreenenter, fullscreenexit.
UPD. Taken from the comments:

something is wrong with them

Handlers should be attached not to the map itself, but to the control responsible for switching the fullscreen mode:

const fs = map.controls.get('fullscreenControl');
fs.events.add('fullscreenenter', () => console.log('ON'));
fs.events.add('fullscreenexit', () => console.log('OFF'));