ion"><a href="/api/checkpoints/interfaces/checkpoints/checkpoints/methods/setter/addcheckpoint/">addCheckpoint</a></span><span class="punctuation">(</span><span class="string">'sale'</span><span class="punctuation">)</span><span class="punctuation">;</span>

<span class="keyword">const</span> app <span class="operator">=</span> document<span class="punctuation">.</span><span class="function">createElement</span><span class="punctuation">(</span><span class="string">'div'</span><span class="punctuation">)</s