code: function() {
      this.typeCount_ = 2;
      this.updateShape_();
      this.setOutput(true, 'Type');
      this.setMutator(new Blockly.Mutator(['type_group_item']));
      this.setColour(230);
      this.setTooltip('Allows more than one type to be accepted.');
      this.setHelpUrl('https://www.youtube.com/watch?v=s2_xaEvcVI0#t=677');
    }
docs: Group of types.