Convert from a DOM Node included childNodes nested to a nested array.

convertNodeTreeToArray.js

var convert = (a) => {
  var r = []
  if (a.firstChild === null) {
    r.push(a)
  }
  else if (a.childNodes.length > 0) {
    var c = a.childNodes
    Array.from(c).forEach(function (v) {
        if (v.firstChild === null) {
          r.push(v)
        }
        else {
          var x = convert.apply(this, [v])
          r.push.apply(r, [x])
        }
    })
  }
  return r
}