feat(28491): add QF to declare missing properties

[a-tarasyuk]

Fixes #28491

[typescript-bot]

The TypeScript team hasn't accepted the linked issue #28491. If you can get it accepted, this PR will have a better chance of being reviewed.

[DanielRosenwasser]

Just want a bit more test coverage.

[andrewbranch]

@typescript-bot pack this

[typescript-bot]

Heya @andrewbranch, I've started to run the tarball bundle task on this PR at 5896e3b. You can monitor the build here.

[typescript-bot]

Hey @andrewbranch, I've packed this into an installable tgz. You can install it for testing by referencing it in your package.json like so:

{
    "devDependencies": {
        "typescript": "https://typescript.visualstudio.com/cf7ac146-d525-443c-b23c-0d58337efebc/_apis/build/builds/105173/artifacts?artifactName=tgz&fileId=C607D22BDB832E857D96A8EDE1088CB00C7D84B8C315BAC7837C2B5B7FCDFACA02&fileName=/typescript-4.4.0-insiders.20210617.tgz"
    }
}

and then running npm install.

---

There is also a playground for this build and an npm module you can use via "typescript": "npm:@typescript-deploys/[email protected]".;

[andrewbranch]

No playground link @typescript-bot? ☹️

[andrewbranch]

Thanks!