Feature Request: Add Syntax Highlighting for Semantic TypeScript Diagnostics

[hediet]

It is very hard to see what is going on given this error message:

If VS Code's markdown support could be used in those semantic diagnostics, types could be put in code blocks. This would increase readability significantly.

I suggest the following rule:
Treat everything in TS error messages enclosed with ' as code (in the following $code). If $code is shorter than 15 characters, emit it as `$code`, otherwise as

```ts
$code
```

Of course this makes the assumption that the formatting of types is consistent and typescript does not nest ' in its error messages. String literal types use ".

If you point me to the central code locations that might need to be touched, I can try to create a PR for this.

[sandy081]

@mjbvz Is this duplicate of #54272 ?

[hediet]

Oh, I assumed displaying markdown in diagnostics was already possible. Additionally to #54272, this would also need concrete changes for the typescript extension to make use of the markdown.

[mjbvz]

Closing as a duplicate of #54272

@hediet Yes, we would only want to enable highlighting if an extension requests it (such as using markdown code blocks)