import type { ResponseContext } from './interceptors.js';
import type { CacheEvictionReason, CacheStore } from './cache-store.js';
export interface InMemoryCacheStoreConfig {
    maxEntries: number;
    maxMemoryBytes: number;
    onEvict?: (reason: CacheEvictionReason) => void;
}
export interface InMemoryCacheStoreStats {
    entries: number;
    maxEntries: number;
    memoryBytes: number;
    maxMemoryBytes: number;
}
/**
 * In-memory LRU cache with TTL and memory budget guardrails.
 *
 * Why this exists: plain Map-based caches can grow without bound and exhaust memory.
 */
export declare class InMemoryCacheStore implements CacheStore {
    private readonly config;
    private entries;
    private memoryBytes;
    constructor(config: InMemoryCacheStoreConfig);
    get(key: string, nowMs?: number): ResponseContext | undefined;
    set(key: string, response: ResponseContext, ttlSeconds: number, nowMs?: number): void;
    delete(key: string): boolean;
    clear(): void;
    getStats(): InMemoryCacheStoreStats;
    private touch;
    private removeExpired;
    private evictUntilWithinBudget;
    private removeEntry;
    private estimateEntrySize;
}
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