Setting auth.languageCode is impossible due to PromiseProxy.

This issue comes from the PromiseProxy and the fact that languageCode is both a getter and setter.

Version info

Angular: “@angular/core”: “~10.1.4”, Firebase: “firebase”: “^7.19.1”, AngularFire: “@angular/fire”: “^6.0.2”,

How to reproduce these conditions

// Try to change AngularFIreAuth languageCode
this.fireAuth.languageCode = 'fr';
// This fails because "Type 'string' is not assignable to type 'Promise<string>'."
// This comes from the PromiseProxy and the fact that languageCode is both a getter and setter.

// Setting to a Promise doesn't have any effect.
this.fireAuth.languageCode = new Promise(() => 'fr');

Expected behavior

I should be able to change the languageCode of the auth Object, to send email action templates in the user’s language.

Actual behavior

The languageCode property doesn’t work with the PromiseProxy. All email action templates are sent with the default Firebase Console language setting.

[jamesdaniels]

6.1.0-rc.2 now has USE_DEVICE_LANGUAGE and LANGUAGE_CODE DI tokens which allow configuration of the auth language.

[kertof]

Fantastic!

As a current workaround, I use firebase directly, with a delay, to make sure the app is initialized by AngularFire first.

import * as firebase from 'firebase/app';
import 'firebase/auth';

firebase.auth().languageCode = langCode;