"Belt_internalMapString.html#TYPEkey">key</a> -> 'a option</code></pre>
<pre><span id="VALgetUndefined"><span class="keyword">val</span> getUndefined</span> : <code class="type">(<a href="Belt_internalMapString.html#TYPEkey">key</a>, 'a) N.t -><br>       <a href="Belt_internalMapString.html#TYPEkey">key</a> -> 'a Js.Undefined.t</code></pre>
<pre><span id="VALgetExn"><span class="keyword">val</span> getExn</span> : <code class="type">(<a href="Belt_internalMapString.html#TYPEkey">key</a>, 'a) N.t -> <a href=