export declare const KEY_CODES: {
    ALT: number;
    ARROW_DOWN: number;
    ARROW_LEFT: number;
    ARROW_RIGHT: number;
    ARROW_UP: number;
    AUDIO_DOWN: number;
    AUDIO_MUTE: number;
    AUDIO_UP: number;
    BACKSPACE: number;
    CAPS_LOCK: number;
    COMMA: number;
    COMMAND_LEFT: number;
    COMMAND_RIGHT: number;
    COMMAND_FIREFOX: number;
    CONTROL: number;
    DELETE: number;
    END: number;
    ENTER: number;
    ESCAPE: number;
    F1: number;
    F2: number;
    F3: number;
    F4: number;
    F5: number;
    F6: number;
    F7: number;
    F8: number;
    F9: number;
    F10: number;
    F11: number;
    F12: number;
    F13: number;
    F14: number;
    F15: number;
    F16: number;
    F17: number;
    F18: number;
    F19: number;
    HOME: number;
    INSERT: number;
    MEDIA_NEXT: number;
    MEDIA_PLAY_PAUSE: number;
    MEDIA_PREV: number;
    MEDIA_STOP: number;
    NULL: number;
    NUM_LOCK: number;
    PAGE_DOWN: number;
    PAGE_UP: number;
    PAUSE: number;
    PERIOD: number;
    SCROLL_LOCK: number;
    SHIFT: number;
    SPACE: number;
    TAB: number;
    A: number;
    C: number;
    D: number;
    F: number;
    L: number;
    O: number;
    P: number;
    S: number;
    V: number;
    X: number;
    Y: number;
    Z: number;
};
/**
 * Returns true if keyCode represents a printable character.
 *
 * @param {number} keyCode The keyboard key code.
 * @returns {boolean}
 */
export declare function isPrintableChar(keyCode: number): boolean;
/**
 * @param {number} keyCode The keyboard key code.
 * @returns {boolean}
 */
export declare function isFunctionKey(keyCode: number): boolean;
/**
 * Checks if passed key code is ctrl or cmd key. Depends on what OS the code runs it check key code based on
 * different meta key codes.
 *
 * @param {number} keyCode The keyboard key code.
 * @returns {boolean}
 */
export declare function isCtrlKey(keyCode: number): boolean;
/**
 * Checks if passed key code is ctrl or cmd key. This helper checks if the key code matches to meta keys
 * regardless of the OS on which it is running.
 *
 * @param {number} keyCode The keyboard key code.
 * @returns {boolean}
 */
export declare function isCtrlMetaKey(keyCode: number): boolean;
/**
 * @param {number} keyCode The keyboard key code.
 * @param {string} baseCode The list of the key codes to compare with.
 * @returns {boolean}
 */
export declare function isKey(keyCode: number, baseCode: string): boolean;