       (<a href="Belt_internalMapString.html#TYPEkey">key</a>, 'a) N.node -><br>       'a <a href="Belt_internalMapString.html#TYPEt">t</a> * 'a option * 'a <a href="Belt_internalMapString.html#TYPEt">t</a></code></pre>
<pre><span id="VALsplit"><span class="keyword">val</span> split</span> : <code class="type"><a href="Belt_internalMapString.html#TYPEkey">key</a> -><br>       (<a href="Belt_internalMapString.html#TYPEkey">key</a>, 'a) N.node <a href="Js.html#TYPEnull">Js.null</a> -><br>       (<a href="Belt