range.js

function *_range(from, to) {
  if (to === undefined) {
    yield *_range(0, from);
    return;
  }

  yield [ from ];

  if (from >= to) return;

  yield *_range(from + 1, to);
}

function chain(...args) {
  const next = (
    function*() {
      for (const acc of this) {
        for (const [i] of _range(...args)) {
          yield [ ...acc, i ];
        }
      }
    }
  ).bind(this)();

  Object.defineProperty(next, 'range', { value: chain });

  return next;
}

const range = (...args) => {
  const it = _range(...args);
  Object.defineProperty(it, 'range', { value: chain });

  return it;
}

for (const [ a, b, c, d, e ] of range(6).range(6).range(6).range(6).range(6)) {
  console.log({ a, b, c, d, e });
}

module.exports = { range };