anchor.diff:    };
   
     const makeDiffCount = (lineCount, diff, cssName) => {
  -    if (!inDiffMode()) {
  -      return '';
  -    }
  +    if (!inDiffMode()) { return ''; }
       const div = $('<div>', {
         'class': `diff-${cssName}-line-count`,
         'data-filename': diff.filename
  
positive.code:     // Builds click handlers for all filenames for a given
      // [ kata-id, was-index, now-index] tuple.
      // When you open a new filename it auto-scrolls its first diff-chunk.
      // When you reclick a filename it auto-scrolls to its *next* diff-chunk.
      const getFilename = (node) => $.trim(node.text());
      const id = (name) => $(`[id="${name}"]`);
      const diffFileContentFor = (filename) => id(`diff_file_content_for_${filename}`);
  
negative.code:   };
  
    const makeDiffLineCountIcon = (cssName, icon) => {
      if (!inDiffMode()) { return ''; }
      return `<div class="diff-${cssName}-line-count-icon">${icon}</div>`;
    };
  
    const makeDiffDeletedCount = (lineCount, diff) => {
  