Function signIn

signIn(ctx: AmplifyContext, input: SignInInput): Promise<SignInOutput>
Parameters
- ctx: AmplifyContext
- input: SignInInput
Returns Promise<SignInOutput>
signIn(input: SignInInput): Promise<SignInOutput>
Signs a user in
Parameters
- input: SignInInput
  The SignInInput object
Returns Promise<SignInOutput>
SignInOutput
Throws
service: InitiateAuthException, RespondToAuthChallengeException
- Cognito service errors thrown during the sign-in process.
Throws
validation: AuthValidationErrorCode - Validation errors thrown when either username or password are not defined.

Throws
AuthTokenConfigException - Thrown when the token provider config is invalid.