/**
 * Token bucket rate limiter for IPNS operations.
 * Caps outbound requests to delegated-ipfs.dev to
 * avoid being rate-limited or banned at scale.
 *
 * GossipSub is the primary notification path; IPNS
 * is best-effort. When the bucket is empty, callers
 * can either wait (acquire) or skip (tryAcquire).
 */
export interface IpnsThrottle {
    /** Non-blocking: returns true if a token was
     * available, false otherwise. */
    tryAcquire(): boolean;
    /** Blocking: waits for a token. Rejects if the
     * signal is aborted before a token is available. */
    acquire(signal?: AbortSignal): Promise<void>;
    /** Current throttle statistics. */
    metrics(): {
        acquired: number;
        rejected: number;
    };
}
export declare function createIpnsThrottle(ratePerSec: number): IpnsThrottle;
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