import type { IncomingHttpHeaders } from 'node:http';
export declare function getHeaderString(headers: IncomingHttpHeaders, name: string): string | undefined;
export declare function sanitizeHeaderValue(value: string, maxLength?: number): string;
export declare function hasSignatureHeaders(headers: IncomingHttpHeaders): boolean;
export declare function parseCoveredHeaders(signatureInput: string): string[];
export declare function getSensitiveCoveredHeader(coveredHeaders: string[]): string | null;
export declare function extractForwardedHeaders(incomingHeaders: IncomingHttpHeaders, coveredHeaders: string[]): Record<string, string>;
export declare function filterHopByHopHeaders(headers: Record<string, string | string[] | undefined>): Record<string, string>;
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