-t/index.html">DataItem.t</a> <a href="../../ezjs-utils/Ocp_js/index.html#module-Js">Ocp_js.Js</a>.t</span> <span>&#45;&gt;</span> <span><span class="type-var">'a</span> Js_of_ocaml.Js.meth</span>; .. &gt; Js_of_ocaml.Js.t</span> <span>&#45;&gt;</span> string <span>&#45;&gt;</span> <span class="type-var">'a</span></code></dt><dt class="spec value" id="val-add_edge"><a href="#val-add_edge" class="anchor"></a><code><span class="keyword">val</span> add_edge : <span>&lt; add : <span><a href="DataItem/class-type