export declare class Cache {
    visited: Record<string, boolean>;
    persisted: Record<string, unknown>;
    pathToFile: string;
    constructor(docId: string, cacheDir?: any);
    save(noPrune?: boolean): void;
    getKey(key: string): any;
    setKey(key: string, value: any): void;
    private prune;
}
export declare function readJSON(filePath: string): JSON;