Object.keys(
  availableLocales({
    test: true,
  }),
).forEach((locale) => {
  // ...
});

this.layoutPartsToHide = this.utils.hashset(
  _.flatMap(this.visibilityHandlers, (fn) => fn())
    .concat(this.record.resolved_legacy_visrules)
    .filter(Boolean),
);

var jqxhr = $.ajax("example.php").done(doneFn).fail(failFn);