export declare type BottomBarOptions = {
    brandingElement: HTMLElement;
    onSlowDown: () => number;
    onSpeedUp: () => number;
    onRestart: () => void;
};
export declare type BottomBar = {
    element: HTMLElement;
    switchToRestart: () => void;
    switchToSpeedControl: () => void;
};
export declare function createBottomBar({ brandingElement, onSlowDown, onSpeedUp, onRestart, }: BottomBarOptions): BottomBar;