TypesBCP47

TypeScript library for language tags from BCP47

Installation

npm install typesbcp47

Class LanguageUtils provides static methods for parsing and validating language tags from BCP47.

Method	Description
getTagDescription(tag: string): string	Returns a language description for the tag if the tag is a valid language tag. Returns undefined otherwise.
normalizeCode(code: string): string	Returns a normalized code if the code is valid.
isCJK(code: string): boolean	Returns true if the language is Chinese, Japanese, Korean, Vietnamese or Aiunu. Returns false otherwise.
isBiDi(code: string): boolean	Returns true if the language is written from right to left (Arabic, Hebrew, Persian, Urdu), false otherwise.
getLanguages(locale: string): Array<Language>	Returns an array of Language objects with descriptions in the selected locale.
getLanguage(code: string, locale: string): Language	Returns a Language object by its code with descriptions in the selected locale if the code is valid. Returns undefined otherwise.
getCommonLanguages(locale: string): Array<Language>	Returns an array of most common Language objects with descriptions in the selected locale.
static isValidLanguageTag(tag: string, caseSensitive?: boolean): boolean	Returns true if the tag is a valid language tag. Returns false otherwise. If caseSensitive is true, the tag must be in correct case to be valid.

Note: Valid values for locale parameter are en, es and fr.

---

You can get information about language tags using the LanguageUtils class as shown in the example below:

import { LanguageUtils } from 'typesbcp47';

const tag : string = 'en-US';
const description : string | undefined = LanguageUtils.getTagDescription(tag);

if (LanguageUtils.isValidLanguageTag(tag)) {
  console.log(`Language tag ${tag} is valid. Description: ${description}`);
} else {
  console.log(`Language tag ${tag} is invalid.`);
}