import { SignInInput, SignInOutput } from '../types';
/**
 * Signs a user in
 *
 * @param input -  The SignInInput object
 * @returns SignInOutput
 * @throws service: {@link InitiateAuthException }, {@link RespondToAuthChallengeException }
 *  - Cognito service errors thrown during the sign-in process.
 * @throws validation: {@link AuthValidationErrorCode  } - Validation errors thrown when either username or password
 *  are not defined.
 * @throws AuthTokenConfigException - Thrown when the token provider config is invalid.
 */
export declare function signIn(input: SignInInput): Promise<SignInOutput>;