import { Dispatch, SetStateAction } from 'react';
import { QuestionnaireState } from 'types/QuestionnaireState';
import { hydrateStep } from '../hydrateStep';
import { DescriptorState } from '../types';
type BaseStep = ReturnType<typeof hydrateStep>;
/**
 * Sync form state with the hydrated step on every render of a new
 * descriptor state: clear fields that are now hidden, reset stale option
 * values, and seed defaults on fields that just became visible. The
 * summary step is one-shot — its sync runs once on arrival to avoid
 * cascading clears as fields hide each other.
 *
 * Returns the step key whose sync has run, which the caller uses to gate
 * Submit so it can't fire with pre-sync fields (e.g. before summary
 * defaults like signature are seeded).
 */
export declare const useFieldSync: (descriptorState: DescriptorState, baseStep: BaseStep, setFields: Dispatch<SetStateAction<QuestionnaireState>>) => string | null;
export {};