export declare enum EventKey {
    ArrowLeft = "ArrowLeft",
    ArrowRight = "ArrowRight",
    ArrowUp = "ArrowUp",
    ArrowDown = "ArrowDown",
    Home = "Home",
    End = "End"
}
export type KeyDirection = 'horizontal' | 'vertical' | 'both';
export declare enum Navigation {
    PREVIOUS = "PREVIOUS",
    NEXT = "NEXT",
    VERY_FIRST = "VERY_FIRST",
    VERY_LAST = "VERY_LAST",
    PREVIOUS_ROW = "PREVIOUS_ROW",
    NEXT_ROW = "NEXT_ROW",
    FIRST_IN_ROW = "FIRST_IN_ROW",
    LAST_IN_ROW = "LAST_IN_ROW"
}
export type TabStop = Readonly<{
    id: string;
    domElementRef: React.RefObject<Element>;
    disabled: boolean;
    rowIndex: number | null;
}>;
export type RowStartMap = Map<Exclude<TabStop['rowIndex'], null>, number>;
export type State = Readonly<{
    selectedId: string | null;
    allowFocusing: boolean;
    tabStops: readonly TabStop[];
    direction: KeyDirection;
    focusOnClick: boolean;
    loopAround: boolean;
    rowStartMap: RowStartMap | null;
}>;
export type Options = Partial<Pick<State, 'direction' | 'focusOnClick' | 'loopAround'>>;
export declare enum ActionType {
    REGISTER_TAB_STOP = "REGISTER_TAB_STOP",
    UNREGISTER_TAB_STOP = "UNREGISTER_TAB_STOP",
    KEY_DOWN = "KEY_DOWN",
    CLICKED = "CLICKED",
    TAB_STOP_UPDATED = "TAB_STOP_UPDATED",
    OPTIONS_UPDATED = "OPTIONS_UPDATED"
}
export type Action = {
    type: ActionType.REGISTER_TAB_STOP;
    payload: TabStop;
} | {
    type: ActionType.UNREGISTER_TAB_STOP;
    payload: {
        id: TabStop['id'];
    };
} | {
    type: ActionType.TAB_STOP_UPDATED;
    payload: {
        id: TabStop['id'];
        rowIndex: TabStop['rowIndex'];
        disabled: TabStop['disabled'];
    };
} | {
    type: ActionType.KEY_DOWN;
    payload: {
        id: TabStop['id'];
        key: EventKey;
        ctrlKey: boolean;
    };
} | {
    type: ActionType.CLICKED;
    payload: {
        id: TabStop['id'];
    };
} | {
    type: ActionType.OPTIONS_UPDATED;
    payload: Options;
};
export type Context = Readonly<{
    state: State;
    dispatch: React.Dispatch<Action>;
}>;
export type HookResponse = [
    number,
    boolean,
    (event: React.KeyboardEvent) => void,
    () => void
];
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