 popUndefined</span> : <code class="type">'a <a href="Belt_MutableStack.html#TYPEt">t</a> -> 'a <a href="Js.html#TYPEundefined">Js.undefined</a></code></pre>
<pre><span id="VALpop"><span class="keyword">val</span> pop</span> : <code class="type">'a <a href="Belt_MutableStack.html#TYPEt">t</a> -> 'a option</code></pre>
<pre><span id="VALtopUndefined"><span class="keyword">val</span> topUndefined</span> : <code class="type">'a <a href="Belt_MutableStack.html#TYPEt">t</a> -> 'a <a href="Js.html#TYPEundefined">