References

summary
private	F _window(n: number, iterable: IterableIterator): IterableIterator Repeatedly yields the same deque that is updated to contain the current element of the input iterable iterator and the next `n-1` elements of the input iterable iterator.
public	F window(n: number, iterable: Iterable): IterableIterator<Array> Yields arrays that contain the current element of the input iterable and the next `n-1` elements of the input iterable.