code: function compileTpl(file, options) {
      let {config} = options;
      let allowCache = !config || config.cache == null || config.cache;
      let content = file.content.toString();
      const ast = file.ast || parseDom(content);
      allowCache && (file.ast = ast);
  
      let plugins = mergeVisitors((config && config.plugins) || []);
  
      transformAst(
          ast, plugins,
          Object.assign({}, options, {file})
      );
  
      let {keepOriginalContent} = config || {};
      if (!keepOriginalContent) {
          // serialize by xml mode, close all elements
          content = serializeDom(ast, {xmlMode: true});
      }
  
      return {
          ast,
          content
      };
  }
docs: Compile template
  
  @param {Object} file the file to compile
  @param {Object} options compile option
  @param {Object} options.config compile config
  @param {Array.<Array|Object>} options.config.plugins the template transform plugins
  the plugin item structure: `[transform, options]` or `transform`
  @return {Object}