import { JsonWebKeySet, JsonWebKey } from '../types';
/**
 * Cache for JSON Web Key Sets with automatic expiry
 */
export declare class JwksCache {
    private readonly cache;
    private readonly defaultTtl;
    constructor(defaultTtl?: number);
    /**
     * Gets a cached JWKS if it exists and hasn't expired
     * @param cacheKey Cache key (typically the JWKS URI)
     * @returns Cached JWKS or null if not found or expired
     */
    get(cacheKey: string): JsonWebKeySet | null;
    /**
     * Stores a JWKS in the cache
     * @param cacheKey Cache key (typically the JWKS URI)
     * @param keySet JWKS to cache
     * @param ttl Optional TTL in milliseconds (defaults to constructor value)
     */
    set(cacheKey: string, keySet: JsonWebKeySet, ttl?: number): void;
    /**
     * Clears all cached JWKS
     */
    clear(): void;
    /**
     * Gets the number of cached JWKS
     */
    get count(): number;
    /**
     * Converts a JWK to PEM format for use with jsonwebtoken
     * @param jwk JSON Web Key
     * @returns PEM-encoded public key
     */
    static jwkToPem(jwk: JsonWebKey): string;
    /**
     * Gets all public keys from a JWKS as a map of kid -> PEM
     * @param keySet JSON Web Key Set
     * @returns Map of key ID to PEM-encoded public key
     */
    static getPublicKeys(keySet: JsonWebKeySet): Map<string, string>;
}
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