import { EventSpecResponse } from "./AvoEventSpecFetchTypes";
export declare class AvoEventSpecCache {
    private cache;
    private globalEventCount;
    static makeKey(apiKey: string, streamId: string, eventName: string): string;
    /**
     * Returns the cached EventSpecResponse, or undefined on cache miss.
     * A cached response with eventSpec: null means "no spec exists for this event".
     */
    get(key: string): EventSpecResponse | undefined;
    /**
     * Returns true if the key exists in the cache and has not expired.
     */
    contains(key: string): boolean;
    set(key: string, value: EventSpecResponse): void;
    flush(): void;
    private purgeExpired;
    private evictLRU;
}