n class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;option<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;null_to_opt&nbsp;:&nbsp;<span class="keywordsign">'</span>a&nbsp;<span class="constructor">Js</span>.null&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;option<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;valFromOption&nbsp;:&nbsp;<span class="constructor">Bs_stdlib_mini</span>.<span class="constructor">Obj</span>.t&