bootstrap-vue/esm/utils/locale.js

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// Localization utilities
import { RX_STRIP_LOCALE_MODS } from '../constants/regex';
import { arrayIncludes } from './array';
import { toString } from './string'; // Languages that are RTL

var RTL_LANGS = ['ar', 'az', 'ckb', 'fa', 'he', 'ks', 'lrc', 'mzn', 'ps', 'sd', 'te', 'ug', 'ur', 'yi'].map(function (locale) {
  return locale.toLowerCase();
}); // Returns true if the locale is RTL

export var isLocaleRTL = function isLocaleRTL(locale) {
  // Determines if the locale is RTL (only single locale supported)
  var parts = toString(locale).toLowerCase().replace(RX_STRIP_LOCALE_MODS, '').split('-');
  var locale1 = parts.slice(0, 2).join('-');
  var locale2 = parts[0];
  return arrayIncludes(RTL_LANGS, locale1) || arrayIncludes(RTL_LANGS, locale2);
};