export interface RateLimiterOptions {
    readonly requestsPerMinute: number;
    readonly minDelayMs: number;
    /** Max distinct domains tracked. Older entries evicted. Default 10_000. */
    readonly maxDomains?: number;
    /** Domain considered idle and evictable after this many ms. Default 600_000 (10 min). */
    readonly idleMs?: number;
}
export interface RateLimiter {
    readonly acquire: (domain: string) => Promise<void>;
}
export declare function makeRateLimiter(options: RateLimiterOptions): RateLimiter;