/code> type represents a set of arbitrary additional props.</p><pre><code><span class="punctuation">{</span><span class="punctuation">[</span>propName<span class="operator">:</span> <span class="builtin">string</span><span class="punctuation">]</span><span class="operator">:</span> <span class="builtin">any</span><span class="punctuation">}</span></code></pre><section class="s2"><h2>Since</h2><p>v1.0.0</p></section></section>