Function signInWithRedirect

signInWithRedirect(input?): Promise<void>
Signs in a user with OAuth. Redirects the application to an Identity Provider.
Parameters
- Optional input: AuthSignInWithRedirectInput
  The SignInWithRedirectInput object, if empty it will redirect to Cognito HostedUI
Returns Promise<void>
Throws
AuthTokenConfigException - Thrown when the user pool config is invalid.

Throws
OAuthNotConfigureException - Thrown when the oauth config is invalid.