Участник:Jack who built the house/canonicalPageName.js

if (mw.config.get('wgNamespaceNumber')) {
  mw.loader.using([
    'mediawiki.util',
    'mediawiki.Title',
    'mediawiki.Uri',
  ]).then(function () {
    function getCanonicalPageName() {
      const page = mw.Title.newFromText(mw.config.get('wgPageName'));
      const title = mw.config.get('wgCanonicalSpecialPageName') ?
        mw.config.get('wgCanonicalSpecialPageName') + page.title.replace(/^[^/]+/, '') :
        page.title;
      return mw.config.get('wgCanonicalNamespace') + ':' + title;
    }

    function setUrl(path) {
      history.replaceState(history.state, '', path);
    }

    if (location.pathname.startsWith(mw.util.getUrl())) {
      const pathName = mw.config.get('wgArticlePath')
    	.replace('$1', mw.util.wikiUrlencode(getCanonicalPageName()));
      setUrl(pathName + location.search + location.hash);
    } else if (location.pathname.startsWith(mw.config.get('wgScriptPath'))) {
      const uri = new mw.Uri();
      if (uri.query.title) {
        uri.query.title = getCanonicalPageName();
        setUrl(uri.getRelativePath());
      }
    }
  });
}