="nx">hasOwnProperty</span><span class="p">(</span><span class="nx">key</span><span class="p">))</span> <span class="p">{</span>
          <span class="kd">var</span> <span class="nx">value</span> <span class="o">=</span> <span class="nx">props</span><span class="p">[</span><span class="nx">key</span><span class="p">];</span>
          <span class="nx">klass</span><span class="p">.</span><span class="nx">property</span><span class="p">(</span><span class="nx">key</span><span class="p">,</span> <span class="