docs: function(data) {
        data.showToUser = !!data.showToUser;
  
        this.importWarnings_.push(data);
  
        // Only log each warning type once. We may want to add some kind of
        // flag to allow reporting all importer warnings.
        if (this.reportedImportWarnings_[data.type] === true)
          return;
  
        if (this.importOptions_.showImportWarnings)
          console.warn(data.message);
  
        this.reportedImportWarnings_[data.type] = true;
      }