unctuation">.</span><span class="token function">property</span><span class="token punctuation">(</span><span class="token string">'completed'</span><span class="token punctuation">)</span><span class="token punctuation">,</span>

<span class="token function-variable function">completed</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="