Some syntax highlighting does not work in TypeScript when a function has several return types

[itayperry]

• VS Code Version: 1.60.2

If all return types are aligned in one line than the coloring works - but beautifying packages such as prettier will always make it fall down. I don't understand why the highlighting doesn't work.

Steps to Reproduce: just write a function in TypeScript that has many types of return value:

As you can see, the const and the return don't get highlighted :(

Another (silly) example:

[Lemmingh]

Minimum reproducible case:

class c {
    m(): number
        | Promise<boolean> {
        return 5;
    }
}

The meta.method.declaration.ts and meta.return.type.ts scopes are lost after a line ending. Then, the last generic makes it further wrong, causing meta.objectliteral.ts.

[Lemmingh]

This case is so similar to microsoft/TypeScript-TmLanguage#812 (comment) that I guess it might be a good one to push forward #77140

[itayperry]

@Lemmingh thank you for replying and looking into it so quickly :)