The SkinMinerva.php doesn't have addHeadItem function or its equivalent. Let's just say that sometimes Javascript has to be generated.
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You can use OutputPage::addHeadItem to add items to the HTML of SkinMinerva.
https://www.mediawiki.org/wiki/Manual:Hooks/BeforePageDisplay
like so:
if ( $skin instanceOf SkinMinerva ) {
// add items
}Please feel free to follow up with any further questions you have and apologies in advance if I have misunderstood the request here.