an> <span class="kc">true</span><span class="p">},</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">chunk</span><span class="p">,</span> <span class="nx">index</span><span class="p">)</span> <span class="p">{</span>
  <span class="k">return</span> <span class="p">(</span><span class="nx">index</span> <span class="o">%</span> <span class="mi">2</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="o">?</span> <span class="nx">chunk</sp