/**
 * Read-side queries over a workflow's durable checkpoint, event log, and
 * timeline. These are inspection/visibility surfaces (no mutation); the write
 * path lives in `checkpoint-io.ts`.
 *
 * @module core/engine/checkpoint-reads
 */
import type { CheckpointState, CheckpointSummary, WorkflowEvent, WorkflowReplay, WorkflowTimelineEntry } from '../types.ts';
import type { EngineInternals } from './internals.ts';
/** Retrieve the event history for a workflow. */
export declare function getEvents(internals: EngineInternals, workflowId: string): Promise<WorkflowEvent[]>;
/**
 * List checkpoint history entries for a workflow, newest first.
 * Returns summary metadata only — use getCheckpointAt for full state.
 */
export declare function listCheckpoints(internals: EngineInternals, workflowId: string): Promise<CheckpointSummary[]>;
/** Retrieve the full deserialized checkpoint state at a specific step. */
export declare function getCheckpointAt(internals: EngineInternals, workflowId: string, step: number): Promise<CheckpointState | null>;
/** Return the durable per-step execution timeline for a workflow. */
export declare function getTimeline(internals: EngineInternals, workflowId: string): Promise<WorkflowTimelineEntry[]>;
/** Reconstruct workflow state at a historical checkpoint step. */
export declare function replayTo(internals: EngineInternals, workflowId: string, step: number): Promise<WorkflowReplay | null>;