/**
 * In-Memory Workflow Storage Implementation
 *
 * Simple in-memory implementation of IWorkflowStorage for testing and development.
 *
 * @module execution/workflow/memory-storage
 */
import type { IWorkflowStorage } from './orchestrator.js';
import type { WorkflowCheckpoint } from './types.js';
/**
 * InMemoryWorkflowStorage - In-memory checkpoint storage
 *
 * Simple implementation that stores checkpoints in a Map.
 * Suitable for testing and single-process workflows.
 * Not suitable for production use with multiple processes.
 */
export declare class InMemoryWorkflowStorage implements IWorkflowStorage {
    _checkpoints: Map<string, WorkflowCheckpoint>;
    /**
     * Save a checkpoint to memory
     *
     * @param checkpoint - Checkpoint to save
     */
    saveCheckpoint(checkpoint: WorkflowCheckpoint): Promise<void>;
    /**
     * Load a checkpoint from memory
     *
     * @param executionId - Execution ID to load
     * @returns Checkpoint or null if not found
     */
    loadCheckpoint(executionId: string): Promise<WorkflowCheckpoint | null>;
    /**
     * List all checkpoints, optionally filtered by workflow ID
     *
     * @param workflowId - Optional workflow ID to filter by
     * @returns Array of checkpoints
     */
    listCheckpoints(workflowId?: string): Promise<WorkflowCheckpoint[]>;
    /**
     * Delete a checkpoint from memory
     *
     * @param executionId - Execution ID to delete
     */
    deleteCheckpoint(executionId: string): Promise<void>;
    /**
     * Clear all checkpoints (useful for testing)
     */
    clear(): void;
    /**
     * Get the number of stored checkpoints (useful for testing)
     */
    size(): number;
}
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