Various skin modules have been deprecated over the years and it's time to finally remove them! This will reduce the amount of ResourceLoader modules in the startup manifest.
[] ''Remove mediawiki.skinning.elements''
Overclocked skin which is unstable is the only user (https://codesearch.wmcloud.org/search/?q=%5B%22%27%5Dmediawiki.skinning.elements&i=nope&files=&excludeFiles=&repos=)
[] Remove mediawiki.skinning.content, [[ https://codesearch.wmcloud.org/search/?q=%5B%22%27%5Dmediawiki.skinning.content%5B%22%27%5D&i=nope&files=&excludeFiles=&repos= | no usages ]]
[] Remove mediawiki.toc.styles, deprecated in 1.37, [[ https://codesearch.wmcloud.org/search/?q=%5B%22%27%5Dmediawiki.toc.styles%5B%22%27%5D&i=nope&files=&excludeFiles=&repos= | used by Cargo ]]. Will degrade gracefully without breaking as the table of content styles are currently double loaded there.
[] Remove mediawiki.legacy.config deprecated in 1.37, [[ https://codesearch.wmcloud.org/search/?q=%5B%22%27%5Dmediawiki.legacy.config&i=nope&files=&excludeFiles=&repos= | no users
]]
[] Remove mediawiki.legacy.shared deprecated in 1.37, [[ https://codesearch.wmcloud.org/search/?q=%5B%22%27%5Dmediawiki.legacy.shared&i=nope&files=&excludeFiles=&repos= | 1 potential user in Chameleon ]], no changes necessary.
[] Remove mediawiki.legacy.commonPrint
[] Remove [[ https://codesearch.wmcloud.org/search/?q=%5B%22%27%5Dmediawiki.skinning.content.externallinks%5B%22%27%5D&i=nope&files=&excludeFiles=&repos= | mediawiki.skinning.content.externallinks ]]. Being used by various skins but patches have been provided.