code: function isStaticHtmlFileExt(filePath) {
          if (!filePath) {
              return false;
          }
  
          return (_staticHtmlFileExts.indexOf(LanguageManager.getLanguageForPath(filePath).getId()) !== -1);
      }
docs: Determine if file extension is a static html file extension.
  @param {string} filePath could be a path, a file name or just a file extension
  @return {boolean} Returns true if fileExt is in the list