wikimedia/mediawiki-core

( function () {

    Object.assign( mw.Api.prototype, /** @lends mw.Api.prototype */ {
        /**
         * Convenience method for 'action=parse'.
         *
         * @param {string|mw.Title} content Content to parse, either as a wikitext string or
         *   a mw.Title.
         * @param {Object} additionalParams Parameters object to set custom settings, e.g.
         *   `redirects`, `sectionpreview`. `prop` should not be overridden.
         * @return {jQuery.Promise<string>} Promise that resolves with the parsed HTML of `wikitext`
         */
        parse: function ( content, additionalParams ) {
            var apiPromise,
                config = $.extend( {
                    formatversion: 2,
                    action: 'parse',
                    // Minimize the JSON we get back, there is no way to access anything else anyway
                    prop: 'text',
                    contentmodel: 'wikitext'
                }, additionalParams );

            if ( mw.Title && content instanceof mw.Title ) {
                // Parse existing page
                config.page = content.getPrefixedDb();
                apiPromise = this.get( config );
            } else {
                // Parse wikitext from input
                config.text = String( content );
                apiPromise = this.post( config );
            }

            return apiPromise
                .then( function ( data ) {
                    return data.parse.text;
                } )
                .promise( { abort: apiPromise.abort } );
        }
    } );

}() );