Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.
mw.loader.load("//www.wikidata.org/w/index.php?title=User:Underlying_lk/reasonatortest.js&action=raw&ctype=text/javascript");

// [[d:User:Yair rand/WikidataInfo.js]]
/* mw.loader.load("//www.wikidata.org/w/index.php?title=User:Yair rand/WikidataInfo.js&action=raw&ctype=text/javascript"); */