eyword">include </span><span class="keyword">sig</span> ... <span class="keyword">end</span></code></span></summary><dl><dt class="spec value" id="val-tToJs"><a href="#val-tToJs" class="anchor"></a><code><span class="keyword">val </span>tToJs : <a href="#type-t">t</a> <span>&#45;&gt;</span> string</code></dt><dt class="spec value" id="val-tFromJs"><a href="#val-tFromJs" class="anchor"></a><code><span class="keyword">val </span>tFromJs : string <span>&#45;&gt;</span> <a href="#type-t">t</a> option</code></dt