import { QuestionnaireState } from '../types/QuestionnaireState';
import { DescriptorState } from './types';
/**
 * Submit-time safety net: drop values for fields whose descriptors say they
 * should be hidden in the current state. A field that disappears from the UI
 * (because the user changed a prior answer) can still hold a stale value in
 * state; this filter prevents that value from leaving in the wire payload.
 *
 * A stateKey is kept when *any* descriptor sharing that slot is both supported
 * and visible — variants targeting the same slot (e.g. `accountHolderNameDps`
 * vs `accountHolderNameWForm`) share storage, so the slot survives if any
 * variant claims it. Keys with no descriptor pass through unchanged.
 *
 * Runs a bounded stabilizing loop: when a non-self-sufficient predicate reads
 * a value that this pass just cleared, the next pass sees the cleared state
 * and can drop the dependent. Bounded by field count because clearing is
 * monotonic — a cleared field stays cleared, and clearing only reduces what
 * can be visible.
 */
export declare const filterHiddenFields: (state: DescriptorState) => QuestionnaireState;