>(</span>input<span class="hl opt">,</span> output<span class="hl opt">,</span> options<span class="hl opt">) {</span>
      <span class="hl kwa">var</span> _ref1<span class="hl opt">;</span>
      <span class="hl kwa">if</span> <span class="hl opt">(</span>options <span class="hl opt">==</span> <span class="hl kwa">null</span><span class="hl opt">) {</span>
        options <span class="hl opt">= {};</span>
      <span class="hl opt">}</span>
      <span class="hl kwa">if</span> <span class="hl opt">((</spa