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diff --git a/includes/ResourceLoader/LanguageDataModule.php b/includes/ResourceLoader/LanguageDataModule.php
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+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @author Santhosh Thottingal
+ */
+
+namespace MediaWiki\ResourceLoader;
+
+use LanguageCode;
+use MediaWiki\MediaWikiServices;
+
+/**
+ * Module for populating language specific data, such as grammar forms.
+ *
+ * @ingroup ResourceLoader
+ * @internal
+ */
+class LanguageDataModule extends FileModule {
+	protected $targets = [ 'desktop', 'mobile' ];
+
+	/**
+	 * Get all the dynamic data for the content language to an array.
+	 *
+	 * @internal Only public for use by GenerateJqueryMsgData (tests)
+	 * @param string $langCode
+	 * @return array
+	 */
+	public static function getData( $langCode ): array {
+		$language = MediaWikiServices::getInstance()->getLanguageFactory()
+			->getLanguage( $langCode );
+		return [
+			'digitTransformTable' => $language->digitTransformTable(),
+			'separatorTransformTable' => $language->separatorTransformTable(),
+			'minimumGroupingDigits' => $language->minimumGroupingDigits(),
+			'grammarForms' => $language->getGrammarForms(),
+			'grammarTransformations' => $language->getGrammarTransformations(),
+			'pluralRules' => $language->getPluralRules(),
+			'digitGroupingPattern' => $language->digitGroupingPattern(),
+			'fallbackLanguages' => $language->getFallbackLanguages(),
+			'bcp47Map' => LanguageCode::getNonstandardLanguageCodeMapping(),
+		];
+	}
+
+	/**
+	 * @param Context $context
+	 * @return string JavaScript code
+	 */
+	public function getScript( Context $context ) {
+		return parent::getScript( $context )
+			. 'mw.language.setData('
+			. $context->encodeJson( $context->getLanguage() ) . ','
+			. $context->encodeJson( self::getData( $context->getLanguage() ) )
+			. ');';
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function enableModuleContentVersion() {
+		return true;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function supportsURLLoading() {
+		return false;
+	}
+}
+
+/** @deprecated since 1.39 */
+class_alias( LanguageDataModule::class, 'ResourceLoaderLanguageDataModule' );