How to use the node-red/red/red.js.nodes function in node-red

var red = {}
    for (var i in RED) {
      if (RED.hasOwnProperty(i) && !/^(init|start|stop)$/.test(i)) {
        var propDescriptor = Object.getOwnPropertyDescriptor(RED, i)
        Object.defineProperty(red, i, propDescriptor)
      }
    }

    red['_'] = function (messageId) {
      return messageId
    }

    redNodes.init({settings: settings, storage: storage, log: log})
    credentials.init(storage, express())
    RED.nodes.registerType('helper', helperNode)

    if (Array.isArray(testNode)) {
      for (var n = 0; n < testNode.length; n++) {
        testNode[n](red)
      }
    } else {
      testNode(red)
    }
    flows.load().then(function () {
      flows.startFlows()
      should.deepEqual(testFlows, flows.getFlows())
      cb()
    })
  },
  unload: function () {

function helperNode (n) {
  RED.nodes.createNode(this, n)
}