export interface UseInvalidStateArgs {
    /** Invalid flag from `useDateFieldForm` (consumer error prop OR validator
     *  result). */
    formInvalid: boolean;
    /** Invalid flag from `useDateFieldValidity` (cross-segment Feb 30,
     *  partial-on-blur). */
    valueInvalid: boolean;
}
/**
 * Aggregates every error-state source into the single flag that drives the
 * `--error` modifier, so a new source becomes another argument here rather than
 * another condition in the orchestrator's JSX.
 */
export declare const useInvalidState: ({ formInvalid, valueInvalid, }: UseInvalidStateArgs) => boolean;