npm i gaffa-grab-drop

var GrabDrop = require('gaffa-grab-drop');

gaffa.registerConstructor(GrabDrop);

var grabDrop1 = new Grabbable();
grabDrop1.grabbable.value = true;
grabDrop1.data.binding = '[something]';

var doSomething = new actions.Set();
doSomething.source.binding = 'data'; // From the grabbable
doSomething.target.binding = '[newPlace]'; // Where to put dropped data

var grabDrop2 = new Droppable();
grabDrop2.actions.drop = [doSomething]; // Give action to the view to trigger on drop.