ass="token comment">// ...</span>
  @action
  <span class="token function">loading</span><span class="token punctuation">(</span><span class="token parameter">transition</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">let</span> start <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span 