import type { IncomingMessage, ServerResponse } from "node:http";
import type { TrinacriaSecurityMode } from "./types";
export declare function hasResponseHeader(res: ServerResponse, name: string): boolean;
export declare function resolveMode(mode: TrinacriaSecurityMode | undefined): TrinacriaSecurityMode;
export declare function isHttpsRequest(req: IncomingMessage, trustProxy: boolean): boolean;
export declare function uniq(values: string[]): string[];
export declare function addSourceToken(existing: string[], source: string): string[];
export declare function renderDirective(directive: string, sources: string[]): string;
export declare function renderCsp(entries: Array<[string, string[]]>): string;