How to use the ts-mockito.instance function in ts-mockito

function getMockUser(auth: StitchAuthImpl) {
    return new StitchUserImpl(
        "test_id", 
        "test_provider", 
        "test_provider",
        true,
        new Date(),
        instance(mock(StitchUserProfileImpl)),
        auth
    )
}

function testClientCall(
  fun: (CoreUserApiKeyAuthProviderClient) => Promise,
  expectedRequest: StitchAuthRequest,
  keyToFetch?: string
): Promise {
  const clientAppId = "my_app-12345";

  const requestClientMock = mock(CoreStitchAuth);
  const requestClient = instance(requestClientMock);

  const routes = new StitchAppRoutes(clientAppId).authRoutes;

  const client = new CoreUserApiKeyAuthProviderClient(requestClient, routes);

  when(
    requestClientMock.doAuthenticatedRequest(new RequestClassMatcher(
      undefined,
      Method.POST
    ) as any)
  ).thenResolve({
    body: JSON.stringify(
      new UserApiKey(new BSON.ObjectID().toHexString(), "2", "3", false)
    ),
    headers: {},
    statusCode: 200

function testClientCall(
  fun: (CoreUserApiKeyAuthProviderClient) => Promise,
  expectedRequest: StitchAuthRequest,
  keyToFetch?: string
): Promise {
  const clientAppId = "my_app-12345";

  const requestClientMock = mock(CoreStitchAuth);
  const requestClient = instance(requestClientMock);

  const routes = new StitchAppRoutes(clientAppId).authRoutes;

  const client = new CoreUserApiKeyAuthProviderClient(requestClient, routes);

  when(
    requestClientMock.doAuthenticatedRequest(new RequestClassMatcher(
      undefined,
      Method.POST
    ) as any)
  ).thenResolve({
    body: JSON.stringify(
      new UserApiKey(new BSON.ObjectID().toHexString(), "2", "3", false)
    ),
    headers: {},
    statusCode: 200

        { provide: PersonalizationService, useFactory: () => instance(mock(PersonalizationService)) },
      ],

      providers: [{ provide: Store, useFactory: () => instance(mock(Store)) }],
    }).compileComponents();

        { provide: Store, useFactory: () => instance(store$) },
      ],

        { provide: ActivatedRoute, useFactory: () => instance(this.mockedActivatedRoute) },
        { provide: IdentityService, useFactory: () => instance(this.mockedIdentityService) },

      { provide: ProductCompareService, useFactory: () => instance(productCompareServiceMock) }
      ]

beforeEach(() => {
    apiService = mock(ApiService);
    when(apiService.icmServerURL).thenReturn('http://server');
    addressService = new AddressService(instance(apiService));
  });

        { provide: IdentityService, useFactory: () => instance(this.mockedIdentityService) },
        { provide: ActivatedRoute, useFactory: () => instance(this.mockedActivatedRoute) },