import { NonceCache } from "@kya-os/contracts/handshake";
/**
 * Cloudflare KV namespace interface
 */
interface KVNamespace {
    get(key: string, options?: {
        type?: string;
    }): Promise<string | null>;
    getWithMetadata?(key: string): Promise<{
        value: string | null;
        metadata?: unknown;
    }>;
    put(key: string, value: string, options?: {
        expirationTtl?: number;
    }): Promise<void>;
    delete(key: string): Promise<void>;
}
/**
 * Cloudflare KV-based nonce cache implementation
 * Suitable for Cloudflare Workers deployments
 */
export declare class CloudflareKVNonceCache implements NonceCache {
    private kv;
    private keyPrefix;
    constructor(kv: KVNamespace, keyPrefix?: string);
    private getKey;
    has(nonce: string, agentDid?: string): Promise<boolean>;
    add(nonce: string, ttl: number, agentDid?: string): Promise<void>;
    cleanup(): Promise<void>;
}
export {};