/**
 * Create a key observer.
 *
 * @returns {object}
 */
export declare function createKeysObserver(): {
    /**
     * Press a key.
     *
     * @param {string} key Names of the shortcut's keys,
     * (coming from [`KeyboardEvent.key`](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key/Key_Values)),
     * in lowercase or uppercase, unified across browsers
     */
    press(key: string): void;
    /**
     * Release a pressed key.
     *
     * @param {string} key Names of the shortcut's keys,
     * (coming from [`KeyboardEvent.key`](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key/Key_Values)),
     * in lowercase or uppercase, unified across browsers
     */
    release(key: string): void;
    /**
     * Release all pressed keys.
     */
    releaseAll(): void;
    /**
     * Check if a key is pressed.
     *
     * @param {string} key Names of the shortcut's keys,
     * (coming from [`KeyboardEvent.key`](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key/Key_Values)),
     * in lowercase or uppercase, unified across browsers
     * @returns {boolean}
     */
    isPressed(key: string): boolean;
};