[ssr] installWindowOnGlobal shim globalThis.global does not inherit any of the existing builtins like Promise

[fetherston]

Description

The DOM shim for @lit-labs/ssr does not inherit the builtin Node APIs from the environment onto the global object. Some third party libraries like koa expect them to be there.

Steps to Reproduce

1. Write this code

import { installWindowOnGlobal } from '@lit-labs/ssr/lib/dom-shim';
installWindowOnGlobal();
if (!global.Promise) {
    throw new Error('global.Promise is missing');
}

2. See this output...
   It'll throw because global.Promise is undefined.

Live Reproduction Link

N/A

Expected Results

global.Promise should be the native Node Promise API

Actual Results

No error should be thrown.

Browsers Affected

N/A