/**
 * StorageService - Unified persistence layer
 *
 * Manages JSON file storage for all Foundation modules:
 * - Worktrees
 * - Sessions
 * - Context Snapshots
 * - Provider Health
 *
 * Storage locations:
 * - ~/.foundation/state/ (global state)
 * - .foundation/ (project-specific state)
 */
import type { Worktree, Session, ContextSnapshot, ProviderHealth } from '../types/index.js';
export declare class StorageService {
    private static instance;
    private globalStateDir;
    private projectStateDir;
    private state;
    private initialized;
    private constructor();
    static getInstance(): StorageService;
    /**
     * Initialize storage by loading existing state
     */
    init(): Promise<void>;
    getWorktrees(): Worktree[];
    getWorktree(id: string): Worktree | undefined;
    getWorktreeByPath(path: string): Worktree | undefined;
    getWorktreeByAlias(alias: string): Worktree | undefined;
    addWorktree(worktree: Worktree): void;
    updateWorktree(id: string, updates: Partial<Worktree>): void;
    removeWorktree(id: string): void;
    getSessions(): Session[];
    getSession(id: string): Session | undefined;
    getActiveSessions(): Session[];
    addSession(session: Session): void;
    updateSession(id: string, updates: Partial<Session>): void;
    removeSession(id: string): void;
    getSnapshots(): ContextSnapshot[];
    getSnapshot(id: string): ContextSnapshot | undefined;
    getSnapshotByName(name: string): ContextSnapshot | undefined;
    addSnapshot(snapshot: ContextSnapshot): void;
    removeSnapshot(id: string): void;
    getProviderHealth(): ProviderHealth[];
    getProviderHealthByName(provider: string): ProviderHealth | undefined;
    updateProviderHealth(provider: string, updates: Partial<ProviderHealth>): void;
    private ensureDir;
    private getFilePath;
    private loadFile;
    private saveFile;
    /**
     * Get the global state directory path
     */
    getGlobalStateDir(): string;
    /**
     * Get the project state directory path
     */
    getProjectStateDir(): string;
}
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