import { AwsCredentialIdentityProvider } from "@aws-sdk/types";
import { MapAuthHelper, SDKAuthHelper } from "../common/types";
/**
 * Creates an auth helper instance using an arbitrary AWS credentials provider function. This is useful when credentials
 * are obtained through a custom mechanism, such as a Cognito Identity Pool that requires authentication first, or a
 * dedicated back-end service.
 *
 * @param credentialProvider A function that returns AWS credentials (or a promise of them).
 * @param region The AWS region for signing requests.
 */
export declare function withCredentialProvider(credentialProvider: AwsCredentialIdentityProvider, region: string): Promise<MapAuthHelper & SDKAuthHelper>;