s="token punctuation">.</span>previousTransition<span class="token punctuation">;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>previousTransition<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span><span class="token string">'previousTransition'</span><span class="token punc