code: function lintMarkdown(files) {
      const config = yaml.safeLoad(fs.readFileSync(path.join(__dirname, "./.markdownlint.yml"), "utf8")),
          result = markdownlint.sync({
              files,
              config,
              resultVersion: 1
          }),
          resultString = result.toString(),
          returnCode = resultString ? 1 : 0;
  
      if (resultString) {
          console.error(resultString);
      }
      return { code: returnCode };
  }
docs: Lints Markdown files.
  @param {Array} files Array of file names to lint.
  @returns {Object} exec-style exit code object.
  @private