Return types fail to emit for methods of anonymous plain objects

[Andarist]

Bug Report

🔎 Search Terms

declaration emit this any

🕗 Version & Regression Information

• This is the behavior in every version I tried

⏯ Playground Link

Playground link with relevant code

💻 Code

export function test() {
  return {
    relyingOnThis() {
      return this;
    },
  };
}

// seen and recognized locally in TS files
test().relyingOnThis();

🙁 Actual behavior

// generated .d.ts
export declare function test(): {
    relyingOnThis(): any;
};

🙂 Expected behavior

Make this type to work in such contexts and emit that:

declare function test(): {
    relyingOnThis(): this; // currently reports `A 'this' type is available only in a non-static member of a class or interface.(2526)`
};

Or emit the content of the anonymous type there somehow (when possible, be cautious with circularities, generics etc):

declare const _type: {
    relyingOnThis(): typeof _type;
}

declare function test(): typeof _type

Or just emit a diagnostic that this isn't portable and that an explicit annotation is needed.