eyword">const</span> listenerId <span class="operator">=</span> checkpoints<span class="punctuation">.</span><span class="function"><a href="/api/checkpoints/interfaces/checkpoints/checkpoints/methods/listener/addcheckpointidslistener/">addCheckpointIdsListener</a></span><span class="punctuation">(</span><span class="punctuation">(</span><span class="punctuation">)</span> <span class="operator">=></span> <span class="punctuation">{</span>
  console<span class="punctuation">.</span><span class="function">log