User:GhostInTheMachine/SortWhatLinksHere.js Source: en.wikipedia.org/wiki/User:GhostInTheMachine/SortWhatLinksHere.js

function SortWhatLinksHere($el) {
  $el.append(
    $el.children().sort( (a,b) => a.innerHTML < b.innerHTML ? -1 : a.innerHTML > b.innerHTML ? 1 : 0 )
  );
  $.each($el.children(), (i,$sub) => SortWhatLinksHere($($sub).find('ul')));
}

$(function(){
  SortWhatLinksHere($('#mw-whatlinkshere-list'));
});