/**
 * Pre-acceptance validation for workflow updates: running a registered
 * `updateValidators` entry and normalizing a Standard Schema v1 failure result
 * into the issue list `UpdateValidationError` carries.
 *
 * Lives apart from `updates.ts` because it is shared — `pending-updates.ts`
 * normalizes validator results through the same helper — and because it is
 * pure payload validation with no coupling to the in-memory waiter maps or the
 * durable coordinated-update protocol that make up the rest of update delivery.
 *
 * @module core/engine/update-validation
 */
import type { EngineInternals } from './internals.ts';
/**
 * Run the pre-acceptance validator for an update, if one is registered.
 * Throws `UpdateValidationError` if the validator rejects (by throwing or by
 * returning a Standard Schema `{ issues: [...] }` failure result).
 */
export declare function runUpdateValidator(internals: EngineInternals, workflowId: string, name: string, payload: unknown): Promise<void>;
/**
 * Extract issues from a Standard Schema v1 failure result, or null if absent.
 * No string-`message` entries yields `[]`; callers reject only on a non-empty
 * array, so `null` and `[]` both mean acceptance. Preserves `path` (RFC 6901).
 */
export declare function extractStandardSchemaIssues(result: unknown): Array<{
    message: string;
    path?: string;
}> | null;