Proposal: Implement autocompletion for OverrideProperties

[henriqueinonhe]

Currently, while OverrideProperties restricts the keys you can override to the keys that are present in the type you pass (TOriginal), it doesn't offer autocomplete:

But with a simple tweak we can enable autocompletion:

Here's a demo showcasing the implementation:

https://stackblitz.com/edit/typescript-zyn86c?file=index.ts

This implementation keeps keys "strict", in the sense that you cannot override/add keys that are not present in the original type.

If maintainers agree that this is a good improvement, I can create a PR.

[sindresorhus]

PR welcome