/**
 * @module constants
 */
/**
 * interface of keycode.
 */
export interface Keycode {
    [keyName: string]: number;
}
/**
 * key of object is keyname.
 *
 * value of object is event.keycode.
 *
 * Some keycode different in `firefox`.
 *
 * ```ts
 * if(event.keycode === keycode.ENTER) {
 *   // ...
 * }
 * ```
 */
export declare const keycode: Keycode;