extensions/emmet/src/util.ts/getSyntaxes
export function getSyntaxes() {
	/**
	 * List of all known syntaxes, from emmetio/emmet
	 */
	return {
		markup: ['html', 'xml', 'xsl', 'jsx', 'js', 'pug', 'slim', 'haml'],
		stylesheet: ['css', 'sass', 'scss', 'less', 'sss', 'stylus']
	};
}