Create WatcherInterface.php

src/WatcherInterface.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Interop\Async\EventLoop;
+
+interface WatcherInterface
+{
+    /**
+     * @return void
+     */
+    public function enable();
+
+    /**
+     * @return void
+     */
+    public function disable();
+
+    /**
+     * @return void
+     */
+    public function cancel();
+}