export declare const ALGORITHM = "AWS4-HMAC-SHA256";
export declare const UNSIGNABLE_HEADERS: string[];
export declare const AMAZON_HEADERS: {
    date: string;
    expires: string;
    algo: string;
    credential: string;
    signed: string;
    signature: string;
    contentSha256: string;
};
export declare const REQUIRED_OPTIONS_KEYS: string[];
export declare const REQUIRED_HEADERS: string[];