import type { ModalMode } from "./useModal";
/**
 * Tracks formfactor transitions (card ↔ sheet) while the modal is already
 * open. `isModeSwitching` is true for the committed render after a mode
 * change and resets when the modal closes.
 */
export type ModalModeSwitchState = {
    readonly prevMode: ModalMode;
    readonly prevIsOpen: boolean;
    readonly isModeSwitching: boolean;
};
export type ModalModeSwitchAction = {
    readonly type: "SYNC";
    readonly mode: ModalMode;
    readonly isOpen: boolean;
};
/** Reducer tracking formfactor transitions (card/sheet) while the modal is open. */
export declare const modalModeSwitchReducer: (state: ModalModeSwitchState, action: ModalModeSwitchAction) => ModalModeSwitchState;