rt</span> <span class="token keyword">default</span> Component<span class="token punctuation">.</span><span class="token function">extend</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  @<span class="token function">service</span><span class="token punctuation">(</span><span class="token string">'shopping-cart'</span><span class="token punctuation">)</span> cart<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctua