ation">)</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 punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        previousTransition<span class="token punctuation">.</span><span cl