import type { TaskGraph } from '../types/task-graph.js';
import type { TaskStore } from './task-tracker.js';
/**
 * In-memory task-graph store used by Goal and tests.
 *
 * The store clones the graph container on read/write so callers cannot replace
 * its Maps/arrays behind the store's back. Task nodes themselves intentionally
 * remain shared: TaskTracker owns node mutation and persists after each change.
 */
export declare class DefaultTaskStore implements TaskStore {
    private readonly graphs;
    saveGraph(graph: TaskGraph): Promise<void>;
    loadGraph(id: string): Promise<TaskGraph | null>;
    listGraphs(): Promise<Array<{
        id: string;
        title: string;
        updatedAt: number;
    }>>;
    deleteGraph(id: string): Promise<void>;
    private cloneGraph;
}
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