code: function() {
      this.jsonInit({
        "message0": Blockly.Msg.LOGIC_NEGATE_TITLE,
        "args0": [
          {
            "type": "input_value",
            "name": "BOOL",
            "check": "Boolean"
          }
        ],
        "output": "Boolean",
        "colour": Blockly.Blocks.logic.HUE,
        "tooltip": Blockly.Msg.LOGIC_NEGATE_TOOLTIP,
        "helpUrl": Blockly.Msg.LOGIC_NEGATE_HELPURL
      });
    }
docs: Block for negation.
  @this Blockly.Block