class="keyword">module</span> Belt_internalBucketsType: <code class="code">sig</code> <a href="Belt_internalBucketsType.html">..</a> <code class="code">end</code></pre><hr width="100%">
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<pre><span id="TYPEopt"><span class="keyword">type</span> <code class="type">'a</code> opt</span> = <code class="type">'a <a href="Js.html#TYPEundefined">Js.undefined</a></code> </pre>
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<pre><span class="keyword">include</span> ??</pre>

<pre><span id="VALtoOpt"><span class="keyword">va