import { Request } from "express";
import { ShieldRule, CookieOptions } from "./types/ShieldTypes";
export declare class RuleEngine {
    private rules;
    constructor(rules?: ShieldRule[]);
    private sortRulesByPriority;
    loadRules(rules: ShieldRule[]): void;
    getCSPDirectives(nonce: string): string;
    shouldSkipCSRF(req: Request): boolean;
    validateCSRFToken(token: string | undefined, storedToken: string | undefined): boolean;
    getSecureCookieOptions(options: CookieOptions): CookieOptions;
    validateRequest(req: Request): Promise<boolean>;
    validateIP(ip: string): boolean;
    private matchIP;
    private isIPInRange;
    getSecurityHeaders(req: Request): Record<string, string>;
    private evaluateCondition;
}
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