Js.undefined</a></code></pre>
<pre><span id="VALtop"><span class="keyword">val</span> top</span> : <code class="type">'a <a href="Belt_MutableStack.html#TYPEt">t</a> -> 'a option</code></pre>
<pre><span id="VALisEmpty"><span class="keyword">val</span> isEmpty</span> : <code class="type">'a <a href="Belt_MutableStack.html#TYPEt">t</a> -> bool</code></pre>
<pre><span id="VALsize"><span class="keyword">val</span> size</span> : <code class="type">'a <a href="Belt_MutableStack.html#TYPEt">t</a> -> int</code></pr