import type { SecurityHeadersBuilder, SecurityHeadersOptions, SecurityHeadersPreset } from "./types";
/**
 * Returns a reusable preset object for security headers.
 */
export declare function securityHeadersPreset(name: SecurityHeadersPreset): SecurityHeadersOptions;
/**
 * Fluent API for building security headers configuration safely.
 */
export declare function createSecurityHeadersBuilder(initial?: SecurityHeadersOptions): SecurityHeadersBuilder;
/**
 * Helmet-like middleware for Trinacria HTTP.
 */
export declare function securityHeaders(options?: SecurityHeadersOptions): (ctx: {
    req: import("node:http").IncomingMessage;
    res: import("node:http").ServerResponse;
    state: Record<string, unknown>;
}, next: () => Promise<unknown>) => Promise<unknown>;