import { Result } from "neverthrow";
import { Parameters } from "structured-headers";
import { VerifyDataEntry } from "./types";
export declare const reduceKeysToLowerCase: <T extends Record<string, unknown>>(obj: T) => Record<string, T[keyof T]>;
declare type GenerateVerifyDataEntriesOptions = {
    readonly coveredFields: [string, Parameters][];
    readonly method: string;
    readonly url: string;
    readonly httpHeaders: {
        readonly [key: string]: string | string[] | undefined;
    };
    readonly existingSignatureKey?: string;
};
/**
 * Create an array of entries consisting of http headers and derived components
 * (as per https://www.ietf.org/archive/id/draft-ietf-httpbis-message-signatures-12.html#name-derived-components)
 * note we return it as entries to guarantee order consistency
 */
export declare const generateVerifyData: (options: GenerateVerifyDataEntriesOptions) => Result<VerifyDataEntry[], string>;
export {};