feat: New language Arabic (ar): add language code type and test

Author: daniel-jones-dev

CHANGELOG.md

@@ -5,6 +5,15 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
+## [Unreleased]
+### Added
+* New language available: Arabic (`'ar'`). Add language code constants and tests.
+  Arabic is currently supported only for text translation; document translation
+  support for Arabic is coming soon.
+
+  Note: older library versions also support the new language, this update only adds new code constants.
+
+
 ## [1.11.1] - 2024-01-26
 ### Fixed
 * Dependencies: Update `follow-redirects` due to security vulnerability
@@ -217,6 +226,7 @@ client library took over this package name. Thanks to
 ownership.
 
 
+[Unreleased]: https://github.com/DeepLcom/deepl-node/compare/v1.11.1...HEAD
 [1.11.1]: https://github.com/DeepLcom/deepl-node/compare/v1.11.0...v1.11.1
 [1.11.0]: https://github.com/DeepLcom/deepl-node/compare/v1.10.2...v1.11.0
 [1.10.2]: https://github.com/DeepLcom/deepl-node/compare/v1.9.0...v1.10.2

src/types.ts

@@ -166,6 +166,7 @@ export interface DocumentTranslateOptions {
  * API accept case-insensitive language codes.
  */
 type CommonLanguageCode =
+    | 'ar'
     | 'bg'
     | 'cs'
     | 'da'

tests/core.ts

@@ -11,6 +11,7 @@ import { v4 as randomUUID } from 'uuid';
 
 // Note: this constant cannot be exported immediately, because exports are locally undefined
 const internalExampleText: Record<string, string> = {
+    ar: 'شعاع البروتون',
     bg: 'протонен лъч',
     cs: 'protonový paprsek',
     da: 'protonstråle',