import { InputDescriptor, Option, QuestionnaireState, StateDeriver } from 'types';
type DateOfEventFieldsOptions = {
    /**
     * Year options for the year child select. Defaults to past years gated
     * by `config.minimumAge` (the date-of-birth shape). Override for any
     * non-birth date — e.g., the next 5 years for a treaty effective date.
     */
    getYearOptions?: StateDeriver<Option[]>;
};
/**
 * Build the `{ month, day, year }` children for a date-of-event descriptor.
 * Each child is a regular `InputDescriptor` with its own state key; their
 * `getChangedFields` keeps the combined `${parentKey}` value in sync.
 */
export declare const buildDateOfEventFields: (parentKey: string, options?: DateOfEventFieldsOptions) => NonNullable<InputDescriptor["fields"]>;
/**
 * Split an `mm/dd/yyyy` string into the three separate state keys for a
 * given parent key. Used by `transformInbound` to seed all four slots from
 * inbound data, since `getChangedFields` only fires from `setValue`.
 *
 * Month and day are padded to 2 digits, year to 4, to match select option
 * values: `getMonthOptions` returns `'01'`–`'12'` and `dayOptions` are
 * `'01'`–`'31'`. Without padding, an unpadded `'3/15/1990'` would store
 * month=`'3'` while the select option is `'03'`, leaving the dropdown blank
 * for pre-filled data.
 */
export declare const splitDateOfEvent: (parentKey: string, combined: string | undefined) => Partial<QuestionnaireState>;
export {};