src/language-css/parser-postcss.js/parseCss
function parseCss(text, parsers, options) {
  const isSCSSParser = isSCSS(options.parser, text);
  const parseFunctions = isSCSSParser
    ? [parseScss, parseLess]
    : [parseLess, parseScss];

  let error;
  for (const parse of parseFunctions) {
    try {
      return parse(text, parsers, options);
    } catch (parseError) {
      error = error || parseError;
    }
  }

  /* istanbul ignore next */
  if (error) {
    throw error;
  }
}