import type { WorkflowStatus } from '../types.ts';
import { type UpdateResponse } from '../updates.ts';
import type { EngineInternals } from './internals.ts';
export declare const TERMINAL_STATUSES: ReadonlySet<WorkflowStatus>;
export type GuardCallbacks = {
    deleteRequestIfUnconsumed: (workflowId: string, updateId: string) => Promise<UpdateResponse | null>;
    getUpdateResponse: (updateId: string) => Promise<UpdateResponse | null>;
};
/** Throw {@link WorkflowTerminalError} if the workflow is in a terminal state. */
export declare function guardTerminalWorkflow(internals: EngineInternals, workflowId: string, _callbacks: GuardCallbacks): Promise<void>;
/**
 * Re-check terminal state after persisting a coordinated update request.
 * This closes the race where the workflow completes between the preflight
 * guard and request creation, which would otherwise leave the caller
 * waiting for a response that can never arrive.
 */
export declare function guardTerminalWorkflowAfterCoordinatedRequest(internals: EngineInternals, workflowId: string, updateId: string, callbacks: GuardCallbacks): Promise<void>;