O resultado final deve ser 550, independente o index da iteração. Online test: https://runkit.com/philippeassis/591b0f3ae1482900125159b9

Nodejs: Teste de loop e callback's

var Promise = require("promise-with-queue"),
  val = 0, position = 0;

var loop = (index, callback) => {
  setTimeout(() => {
    val += index * 10;
    console.log("loop | index:", index, "val:", val)
    ++position;
    callback(val)
  },  Math.floor(Math.random() * (500 - 2000) + 500))
}

var one = new Promise((resolve, reject) => resolve(1))

var two = (base) => new Promise((resolve, reject) => {
  var total = (base * 10);

  for (let i = base; i <= total; i++) {

    loop(i, value => {
      if (position == total) {
        console.log("passou: ", i, "position:", position);
        resolve(value);
      }
    })

  }
})

var tree = (data) => new Promise((resolve, reject) => resolve(`Resultado: ${data}`))

new Promise.queue([one, two, tree]).then(data => console.log(data))