When jsonLibrary=gson is set, the type declarations for a Java interface includes its static members.

public class Demo {
  public static String THIS_FIELD_SHOULD_NOT_BE_INCLUDED;
  public String thisShouldBeIncluded;
}

results in something like (when generating classes as interfaces)

export interface Demo {
  THIS_FIELD_SHOULD_NOT_BE_INCLUDED: string ;
  thisShouldBeIncluded: string;
}

Unless I'm missing something and this is by design (?), they should not be included, at least not when generating typescript interfaces:

• The default new Gson().toJson(someObjectImplementingTheInterfaceWithStaticField) does not seem to includde static fields
• TypeScript does not support static fields in interfaces
• jsonLibrary=jackson2 for static fields also does not seem to include static fields on interfaces

A quick look at the code in the debugger seems like a Modifier.isStatic check in the GsonParser should be enough to solve this: