import { QueryResultCache } from 'typeorm/cache/QueryResultCache';
import { QueryResultCacheOptions } from 'typeorm/cache/QueryResultCacheOptions';
export interface LruQueryResultCacheConfig {
    max?: number;
    maxTtlMs?: number;
}
export declare class LruQueryResultCache implements QueryResultCache {
    private readonly cache;
    private readonly maxSize;
    constructor(config?: LruQueryResultCacheConfig);
    /**
     * Emit `nova.cache.lru.size` and `nova.cache.lru.max` as observable gauges so
     * dashboards can tell "is the LRU full?" directly instead of inferring from
     * hit-rate decay. Filter by `ServiceName` to disambiguate when multiple
     * DataSources share a process.
     */
    private registerSizeGauges;
    connect(): Promise<void>;
    disconnect(): Promise<void>;
    synchronize(): Promise<void>;
    getFromCache(options: QueryResultCacheOptions): Promise<QueryResultCacheOptions | undefined>;
    storeInCache(options: QueryResultCacheOptions): Promise<void>;
    isExpired(saved: QueryResultCacheOptions): boolean;
    remove(identifiers: string[]): Promise<void>;
    clear(): Promise<void>;
    private keyFor;
}