There are various functions listed as deprecated at
https://www.mediawiki.org/wiki/ResourceLoader/JavaScript_Deprecations#wikibits.js
which are not yet marked with mw.log.deprecate in the code[1].

E.g. window.injectSpinner and window.removeSpinner, which were just mentioned at [2].

[1] https://git.wikimedia.org/blob/mediawiki%2Fcore.git/c14f41892426aa8a560ea2a78350cf1f75c13bc9/skins%2Fcommon%2Fwikibits.js

[2] https://www.mediawiki.org/wiki/Thread:Talk:Requests_for_comment/Isolate_custom_jQuery_libraries/already_loading_Spinner,_other_spinner_notes

Version: 1.20.x
Severity: enhancement