How to import Firebase v9 Auth Error object (JS SDK)

Here’s where I need it:

      try {
        await updatePassword(user, password);
      } catch (e) {
        if (e instanceof AuthError) {
          setErrorMessage(e.message);
        }
      }

The reason it’s failing is because AuthError is just an interface exported from the ‘firebase/auth’ module not an actual Error subclass.