Support @deprecated in Visual Studio (2019/2022)

[HolgerJeromin]

Suggestion

Visual Studio Code has support for @deprecated since #390

This feature should be available with Visual Studio (Not VS code), too.

VS2019+2022:

vscode:

✅ Viability Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.

[mdevdatta]

(Found this when I was helping a fellow developer who was wondering why Visual Studio doesn't tell them that a function they are calling is @depracated)

We (company of ~2300+ developers) follow internal coding guidelines to include helpful message with @deprecated tag to help the consumer to explain what they should do instead.

Visual Studio doesn't show any of this including that function is @deprecated - that makes us very very sad.

[icepower03]

same need.
very good idea

[HolgerJeromin]

ref #50285 for another feature parity issue.

[HolgerJeromin]

I have no idea when this was fixed, but my current VS 17.5.2 shows something 🎉

Still nothing in VS2019, so I suspect this is a change in VS2022 and not TS.