iteral-property property">name</span><span class="token operator">:</span> <span class="token string">'Add Dataset'</span><span class="token punctuation">,</span>
    <span class="token function">handler</span><span class="token punctuation">(</span><span class="token parameter">chart</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> data <span class="token operator">=</span> chart<span class="token punctuation">.</span>dat