/**
 * Rate Limit Utilities
 *
 * Maps subscription plans to API rate limits
 */
export interface RateLimitConfig {
    rps: number;
    rpm: number;
    burst?: number;
}
/**
 * Default rate limits by plan tier
 *
 * These limits apply to API key authentication
 * Based on subscription tier or plan key
 */
export declare const RATE_LIMITS_BY_PLAN: Record<string, RateLimitConfig>;
/**
 * Get rate limits for a given plan key
 *
 * @param planKey - The plan key (e.g., "starter", "professional", "enterprise")
 * @returns Rate limit configuration
 */
export declare function getRateLimitsForPlan(planKey: string | null | undefined): RateLimitConfig;
/**
 * Check if a plan has enterprise-level access
 *
 * @param planKey - The plan key
 * @returns True if enterprise plan
 */
export declare function isEnterprisePlan(planKey: string | null | undefined): boolean;
/**
 * Get human-readable rate limit description
 *
 * @param limits - Rate limit configuration
 * @returns Formatted string
 */
export declare function describeRateLimits(limits: RateLimitConfig): string;
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