let iterator = new RecursiveIterator(
  root /* {Object|Array} */,
  [bypassMode = 0] /* {Number} */,
  [ignoreCircular = false] /* {Boolean} */,
  [maxDeep = 100] /* {Number} */
)

let {value, done} = iterator.next()
let {parent, node, key, path, deep} = value

// parent is parent node
// node is current node
// key is key of node
// path is path to node
// deep is current deep

let root = {
  object: {
    number: 1
  },
  string: 'foo'
}

for (let {node, path} of new RecursiveIterator(root)) {
  console.log(path.join('.'), node)
}

// object    Object {number: 1}
// object.number    1
// string    foo