/**
 * Simple in-memory LRU cache for schema metadata
 * Avoids external dependencies like Redis
 */
export declare class SchemaCache {
    private cache;
    private maxSize;
    private ttlMs;
    /**
     * Create a new schema cache
     * @param maxSize Maximum number of entries (default: 100)
     * @param ttlMs Time to live in milliseconds (default: 5 minutes)
     */
    constructor(maxSize?: number, ttlMs?: number);
    /**
     * Get a value from the cache
     * @param key Cache key
     * @returns Cached value or undefined if not found or expired
     */
    get<T>(key: string): T | undefined;
    /**
     * Set a value in the cache
     * @param key Cache key
     * @param value Value to cache
     */
    set<T>(key: string, value: T): void;
    /**
     * Clear all entries from the cache
     */
    clear(): void;
    /**
     * Get current cache size
     */
    size(): number;
    /**
     * Check if a key exists in the cache (and is not expired)
     */
    has(key: string): boolean;
}
export declare const schemaCache: SchemaCache;
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