ChildNode shouldn't be separated from Node

[nin-jin]

TypeScript Version: 3.1.1

Search Terms: ChildNode

Code

let x = document.body.childNodes[1]
x = document.body.firstChild.nextSibling

Expected behavior:

No error. Type of node shouldn't depends on getting way.

Actual behavior:
Error:

Type 'Node' is not assignable to type 'ChildNode'.
  Property 'after' is missing in type 'Node'.

Playground Link

[RyanCavanaugh]

Without a more concrete proposal it seems like you're just proposing allowing any assignment to x, which is not the intended behavior.

[nin-jin]

More concrete proposal: rollback ChildNode invention.