/**
 * The collection of forward arrow keys.
 *
 * @private
 * @since 0.1.0
 */
export declare const ARROW_FORWARD: string[];
/**
 * The collection of backward arrow keys.
 *
 * @private
 * @since 0.1.0
 */
export declare const ARROW_BACKWARD: string[];
/**
 * The collection of all arrow keys.
 *
 * @private
 * @since 0.1.0
 */
export declare const ARROW_KEYS: string[];
/**
 * The map for normalizing differences of keys in browsers.
 *
 * @link https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key/Key_Values
 *
 * @private
 * @since 0.1.0
 */
export declare const NORMALIZATION_MAP: {
    Up: string;
    Down: string;
    Right: string;
    Left: string;
    Del: string;
    Esc: string;
    Spacebar: string;
};
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