package.json types per TypeScript version are not supported

[agross]

Describe the bug

I just learned that TypeScript's package.json "extensions" support not only the types element, but also types depending on the TypeScript version.

https://www.typescriptlang.org/docs/handbook/declaration-files/publishing.html#version-selection-with-typesversions

rxjs@7 is a package that I want to use. It has this kind of types declaration. ioBroker.javascript is unfortunately totally unaware of this, which causes a lot of red squiggles in the editor and perhaps also most of the compiler errors I currently see with the perfectly fine script.

To Reproduce
Steps to reproduce the behavior:

1. Install rxjs@7 and add syntax help for rxjs
2. Create a new TypeScript script with:

   import { Observable } from 'rxjs';
   
   const x = new Observable<number>();

3. Start script
4. See error:

   const x = new Observable<number>();
             ^
   ERROR: Untyped function calls may not accept type arguments.
   

Expected behavior

Code compiles.

Versions:

• Adapter version: 5.2.18
• JS-Controller version: 3.3.22
• Node version: 12.22
• Operating system: docker