Composite is the base class for all composite nodes. Thus, if you want to create new custom composite nodes, you need to inherit from this class.

When creating composite nodes, you will need to propagate the tick signal to the children nodes manually. To do that, override the tick method and call the _execute method on all nodes. For instance, take a look at how the Sequence node inherit this class and how it call its children:

// Inherit from Composite, using the util function Class.
var Sequence = Class(Composite, {

  // Remember to set the name of the node.
  name: 'Sequence',

  // Override the tick function
  tick: function(tick) {

    // Iterates over the children
    for (var i=0; i<this.children.length; i++) {

      // Propagate the tick
      var status = this.children[i]._execute(tick);

      if (status !== SUCCESS) {
          return status;
      }
    }

    return SUCCESS;
  }
});