/**
 * Checkpoint stores for workflow resume support
 */
import type { WorkflowCheckpoint, CheckpointStore } from '@cogitator-ai/types';
/**
 * In-memory checkpoint store (for testing and short-lived workflows)
 */
export declare class InMemoryCheckpointStore implements CheckpointStore {
    private checkpoints;
    save(checkpoint: WorkflowCheckpoint): Promise<void>;
    load(id: string): Promise<WorkflowCheckpoint | null>;
    list(workflowName: string): Promise<WorkflowCheckpoint[]>;
    delete(id: string): Promise<void>;
    clear(): void;
}
/**
 * File-based checkpoint store (persists to disk)
 */
export declare class FileCheckpointStore implements CheckpointStore {
    private directory;
    constructor(directory?: string);
    private ensureDirectory;
    private getFilePath;
    save(checkpoint: WorkflowCheckpoint): Promise<void>;
    load(id: string): Promise<WorkflowCheckpoint | null>;
    list(workflowName: string): Promise<WorkflowCheckpoint[]>;
    delete(id: string): Promise<void>;
}
/**
 * Create a new checkpoint ID
 */
export declare function createCheckpointId(): string;
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