updateChecklists

gistfile1.txt

var notif = new Notification(notification);
var added = notif.addedChecklistItem();

if(!notif.member().notTrellinator())//don't react if the bot added the item
  throw new InvalidActionException("Don't loop!");
  
var added_to = added.checklist();
var source_card = added_to.card();

card.board().cards().each(function(card)
{
  if(card.id() != source_card.id())
  {
    try
    {
      card.checklist(added_to.name()).addItem(added.name());
    }
    
    catch(e)
    {
      Notification.expectException(InvalidDataException,e);
    }
  }
});