Using `typeof this.#privateField` in declaration emit

class StringHolder {
    #data = "hello";

    public getData(): typeof this.#data {
        return this.#data;
    }
}

error TS4055: Return type of public method from exported class has or is using private name 'this'.

8     public getData(): typeof this.#data {
                               ~~~~

Seems strange that we even have this feature if we can’t use this in declaration emit.

[fatcerberus]

Why is it complaining about this rather than the actual thing that’s private?

[dvoytenko]

I’m seeing the same error even for simple cases like this:

class X {
  setValue(): typeof this {
    ...
   return this;
  }
}

It’s convenient to return typeof this in this case because it will also have the right type for the subclasses of X.