Skin is made available for skin specific config.
&$vars: [ variable name => value ]
$skin: Skin
+$config: Config object (since 1.34)
'ResourceLoaderJqueryMsgModuleMagicWords': Called in
ResourceLoaderJqueryMsgModule to allow adding magic words for jQueryMsg.
&$archive: PageArchive object
$title: Title object of the page that we're about to undelete
+'UndeletePageToolLinks': Add one or more links to edit page subtitle when a page
+has been previously deleted.
+$context: IContextSource (object)
+$linkRenderer: LinkRenderer instance
+&$links: Array of HTML strings
+
'UndeleteShowRevision': Called when showing a revision in Special:Undelete.
$title: title object related to the revision
$rev: revision (object) that will be viewed