Migrating from Dragula to Shopify/Draggable/Sortable

In the following code snippets the variable draggable refers to a Draggable.Sortable instance.
You can also check out the fiddle.

Add revertOnSpill functionality to Sortable

var outContainer;
draggable.on('drag:out:container', (e) => {
 outContainer = e.data.overContainer;
});
draggable.on('sortable:stop', (e) => {
 var newContainer = e.data.newContainer;
  var spill = outContainer && outContainer === newContainer;
  if (spill) {
    var oldContainer = e.data.oldContainer;
    var oldContainerChildren = draggable.getDraggableElementsForContainer(oldContainer);
    var emptyOldContainer = !oldContainerChildren.length;
    var source = e.data.dragEvent.data.source;
    if (emptyOldContainer) {
     oldContainer.appendChild(source);
    } else {
      var oldIndex = e.data.oldIndex;
     oldContainer.insertBefore(source, oldContainer.children[oldIndex]);
    }    
  }
});