import { type ServerResponse } from "node:http";
import type { SecurityHeaderName, SecurityHeadersOptions } from "./types.mts";
export type ResolvedSecurityHeaders = Readonly<Partial<Record<SecurityHeaderName, string>>>;
export declare const SECURITY_HEADERS: ResolvedSecurityHeaders;
export declare function resolveSecurityHeaders(options?: SecurityHeadersOptions): ResolvedSecurityHeaders;
export declare function applySecurityHeaders(res: ServerResponse, securityHeaders: ResolvedSecurityHeaders): void;
export declare function ensureFallbackHeaders(res: ServerResponse, securityHeaders?: ResolvedSecurityHeaders, contentSecurityPolicy?: string | false): void;
export declare function sendFallback(res: ServerResponse, securityHeaders?: ResolvedSecurityHeaders, contentSecurityPolicy?: string | false): void;
export declare function getFallbackStatus(error: unknown): number;
export declare function safeString(err: unknown): string;
export declare function getFallbackBody(error: unknown, status: number): string;