export interface RateLimitDecision {
    allowed: boolean;
    /** Seconds until the window resets (for Retry-After). */
    retryAfter: number;
}
export interface RateLimiterOptions {
    redisUrl?: string;
    /** Requests per minute per token. */
    tokenLimit: number;
    /** Requests per minute per IP. */
    ipLimit: number;
    keyPrefix?: string;
}
export declare class RateLimiter {
    private redis;
    private redisFailed;
    private readonly memory;
    private readonly opts;
    constructor(opts: RateLimiterOptions);
    /** Connect to Redis if configured. Safe to call once at boot. */
    init(): Promise<void>;
    /** Check both the per-token and per-IP windows. Fail-open on Redis errors. */
    check(token: string | undefined, ip: string): Promise<RateLimitDecision>;
    private checkOne;
    private checkMemory;
    private pruneMemory;
}
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