pan> <span>dir:string</span> <span>&#45;&gt;</span> Fpath.t <span>&#45;&gt;</span> unit</code></dt><dt class="spec value" id="val-watch"><a href="#val-watch" class="anchor"></a><code><span class="keyword">val</span> watch : <span>watcher:<span><span>(Fpath.t, Current.Job.Map.key)</span> Stdlib.Hashtbl.t</span></span> <span>&#45;&gt;</span> <span>engine:Current.Engine.t</span> <span>&#45;&gt;</span> string <span>&#45;&gt;</span> <span><span>(<span>(unit <span>&#45;&gt;</span> <span>unit Lwt.t</span>)</span>