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framework/core/js/lib/utils/evented.js

@@ -23,6 +23,17 @@ export default {
     this.getHandlers(event).push(handler);
   },
 
+  /**
+
+   */
+  one(event, handler) {
+    var wrapper = function() {
+      handler.apply(this, arguments);
+      this.off(event, wrapper);
+    };
+    this.getHandlers(event).push(wrapper);
+  },
+
   /**
 
    */