export type L1Stats = {
    enabled: true;
    hits: number;
    misses: number;
    sets: number;
    invalidations: number;
    evictions: number;
    staleHits: number;
    size: number;
    ipcAvoided: number;
};
type L1EmitEvent = 'hit' | 'miss' | 'set' | 'invalidate' | 'evict' | 'stale-hit';
type L1EmitPayload = {
    key?: unknown;
    version?: number;
    reason?: string;
};
type L1EmitFn = (event: L1EmitEvent, payload: L1EmitPayload) => void;
type L1ConstructorOptions = {
    max?: number;
    maxSize?: number;
    ttl?: number;
    updateAgeOnGet?: boolean;
    allowStale?: boolean;
    emit?: L1EmitFn;
};
export declare function encodeL1Key(key: {}): string;
export declare class LocalL1Cache<V extends {} = {}> {
    #private;
    constructor(opts: L1ConstructorOptions);
    get(encodedKey: string, eventKey?: unknown): V | undefined;
    set(encodedKey: string, value: V, version: number, ttl?: number, eventKey?: unknown): void;
    delete(encodedKey: string, eventKey?: unknown, emit?: boolean): void;
    clear(emit?: boolean): void;
    advanceLatestSeen(version: number): void;
    latestSeen(): number;
    stats(): L1Stats;
    destroy(): void;
}
export {};
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