index.js
function(token) {
    var filter = {
      val: '', 
      opts: [], 
      type: 'filter'
    }
    
    token.filters.push(filter);
    return filter;
  }
function(token) {
    var filter = {
      val: '', 
      opts: [], 
      type: 'filter'
    }
    
    token.filters.push(filter);
    return filter;
  }
Filter factory