/**
 * ANTRI Security & Rate Limiting Engine
 * Protects against API exhaustion, denial of service, and automated abuse.
 */
export interface RateLimitBucket {
    tokens: number;
    lastRefill: number;
}
export interface RateLimitConfig {
    maxTokens: number;
    refillRatePerMinute: number;
}
export declare class RateLimiter {
    private static buckets;
    private static readonly RULES;
    /**
     * Checks whether a request should be allowed or throttled
     * @param identifier User ID, IP, or session token
     * @param actionType 'chat' | 'tools' | 'sandbox' | 'sync' | 'auth'
     */
    static checkLimit(identifier: string, actionType?: 'chat' | 'tools' | 'sandbox' | 'sync' | 'auth'): {
        allowed: boolean;
        remaining: number;
        retryAfterSeconds?: number;
    };
    /**
     * Resets rate limits for a user (used for testing or admin override)
     */
    static reset(identifier: string): void;
}
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