Accept generics for defineProperty

[sirlancelot]

Both Object.defineProperty() and Object.defineProperties() return their
first argument. Use a generic so that typings can be passed through.

[typescript-bot]

This PR doesn't have any linked issues. Please open an issue that references this PR. From there we can discuss and prioritise.

[ghost]

All CLA requirements met.

[sirlancelot]

Updated baselines.

[sandersn]

I'm cautiously optimistic that this won't break anything, since there wasn't much churn in the test baselines. However, I'd like a second opinion. @orta do you think this is a good idea?

[ExE-Boss]

Arguably, for maximum correctness, it should be what I posted in #41424 (comment), but that might have compatibility issues and be overkill.

See also:

• Add typed overloads to Object.create #39882
• Add typed return for Object.defineProperties #41424
• Allow Object.defineProperty() to definitely assign properties #42919

[sirlancelot]

Arguably, for maximum correctness, it should be what I posted in #41424 (comment), but that might have compatibility issues and be overkill.

Wow, that's really cool! Regrettably, I'm not as well-versed in TypeScript annotations but I know just enough to be able to appreciate that one. 👍

[orta]

Yeah, this generally seems reasonable to me ( hah, Exe-boss that version is wild)

I feel like it's a little strange because the object you pass it would always be modified by going through the function so in theory the T wouldn't necessarily match in the return position. But I think this is what you'd pragmatically expect from the function that the shape of the thing going in is the shape of the thing going out.