declare function isEmptyObject(keys: any): boolean;
declare const MAX_DELTA: 0.2;
declare const CLAMP_VELOCITY: 0.00001;
declare const KEYS: string[];
declare const KEYCODE_TO_CODE: {
    '38': string;
    '37': string;
    '40': string;
    '39': string;
    '87': string;
    '65': string;
    '83': string;
    '68': string;
};
declare const bind: any;
declare const shouldCaptureKeyEvent: any;