Add ConfigInternal to auth-compat.

Author: yuchenshi

packages-exp/auth-compat-exp/src/auth.test.ts

@@ -38,7 +38,7 @@ describe('auth compat', () => {
       app = { options: { apiKey: 'api-key' } } as FirebaseApp;
       underlyingAuth = new exp.AuthImpl(app, {
         apiKey: 'api-key'
-      } as exp.Config);
+      } as exp.ConfigInternal);
       sinon.stub(underlyingAuth, '_initializeWithPersistence');
 
       providerStub = sinon.createStubInstance(Provider);

packages-exp/auth-exp/internal/index.ts

@@ -32,7 +32,7 @@ export {
   AuthEventType
 } from '../src/model/popup_redirect';
 export { UserCredentialInternal, UserParameters } from '../src/model/user';
-export { AuthInternal } from '../src/model/auth';
+export { AuthInternal, ConfigInternal } from '../src/model/auth';
 export { DefaultConfig, AuthImpl, _castAuth } from '../src/core/auth/auth_impl';
 
 export { ClientPlatform, _getClientVersion } from '../src/core/util/version';