How to use the ilib.getLocale function in ilib

function isRtlLocale (options = {}) {
	const {onLoad, sync} = options;

	if (!onLoad) return;

	// eslint-disable-next-line no-new
	new LocaleInfo(ilib.getLocale(), {
		...options,
		onLoad: (li) => {
			const scriptName = li.getScript();
			// eslint-disable-next-line no-new
			new ScriptInfo(scriptName, {
				sync,
				onLoad: (script) => {
					onLoad(script.getScriptDirection() === 'rtl');
				}
			});
		}
	});
}

const updateLocale = function (locale) {
	// blow away the cache to force it to reload the manifest files for the new app
	// eslint-disable-next-line no-undefined
	if (ilib._load) ilib._load.manifest = undefined;
	// remove the cache of the platform name to allow transition between snapshot and browser
	delete ilib._platform;
	// load any external ilib/resbundle data
	ilib.data = global.ilibData || ilib.data;
	ilib.data.cache = ilib.data.cache || {};
	ilib.data.cache['ResBundle-strings'] = global.resBundleData || {};
	// ilib handles falsy values and automatically uses local locale when encountered which
	// is expected and desired
	ilib.setLocale(locale);
	const newLocale = ilib.getLocale();
	// Recreate the case mappers to use the just-recently-set locale
	initCaseMappers();

	return newLocale;
};