wikimedia/mediawiki-core

/*
 * Language-fallback-chain-related utilities for mediawiki.language.
 */
( function () {

    Object.assign( mw.language, {

        /**
         * Get the language fallback chain for current UI language (not including the language itself).
         *
         * @memberof mw.language
         * @return {string[]} List of language keys, e.g. `['de', 'en']`
         */
        getFallbackLanguages: function () {
            return mw.language.getData(
                mw.config.get( 'wgUserLanguage' ),
                'fallbackLanguages'
            ) || [];
        },

        /**
         * Get the language fallback chain for current UI language, including the language itself.
         *
         * @memberof mw.language
         * @return {string[]} List of language keys, e.g. `['pfl', de', 'en']`
         */
        getFallbackLanguageChain: function () {
            return [ mw.config.get( 'wgUserLanguage' ) ]
                .concat( mw.language.getFallbackLanguages() );
        }

    } );

}() );