--- a/src/djol/listen.js	Wed Jun 05 17:44:17 2019 +0300
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,22 +0,0 @@
-define(["ol"], function(ol) {
-
-    var listen = function(target, event, callback) {
-        var key = target.on(event, callback);
-        return {
-            remove : function() {
-                ol.Observable.unByKey(key);
-            }
-        };
-    };
-
-    listen.once =  function(target, event, callback) {
-        var key = target.once(event, callback);
-        return {
-            remove : function() {
-                ol.Observable.unByKey(key);
-            }
-        };
-    };
-
-    return listen;
-});
\ No newline at end of file