import type { NetworkPlan } from '../core/models/network-plan.js';
export interface SavedPlanFile {
    filename: string;
    path: string;
    modifiedAt: Date;
}
export declare class FileService {
    private readonly baseDirectory;
    private planListCache;
    private cacheTimestamp;
    private readonly CACHE_TTL_MS;
    constructor(baseDirectory: string);
    private invalidateCache;
    private isCacheValid;
    savePlan(plan: NetworkPlan, filename: string): Promise<string>;
    loadPlan(filename: string): Promise<NetworkPlan>;
    listPlans(): Promise<SavedPlanFile[]>;
    deletePlan(filename: string): Promise<void>;
}