import { Credentials, HttpRequest, HttpResponse, MiddlewareHandler } from '../../types';
import { MiddlewareContext } from '../../types/core';
/**
 * Options type for the async callback function returning aws credentials. This
 * function is used by SigV4 signer to resolve the aws credentials
 */
export interface CredentialsProviderOptions {
    forceRefresh?: boolean;
}
/**
 * Configuration of the signing middleware
 */
export interface SigningOptions {
    credentials: Credentials | ((options?: CredentialsProviderOptions) => Promise<Credentials>);
    region: string;
    service: string;
    /**
     * Whether to uri encode the path as part of canonical uri. It's used for S3 only where the pathname
     * is already uri encoded, and the signing process is not expected to uri encode it again.
     *
     * @default true
     */
    uriEscapePath?: boolean;
}
/**
 * Middleware that SigV4 signs request with AWS credentials, and correct system clock offset.
 * This middleware is expected to be placed after retry middleware.
 */
export declare const signingMiddlewareFactory: ({ credentials, region, service, uriEscapePath, }: SigningOptions) => (next: MiddlewareHandler<HttpRequest, HttpResponse>, context: MiddlewareContext) => (request: HttpRequest) => Promise<HttpResponse>;