/**
 * A callback to be executed on key events.
 */
export declare type KeyCallback = (pressed: boolean) => void;
/**
 * Handles keyboard events for an {@link HTMLElement}.
 */
export default class KeyboardHandler {
    readonly element: HTMLElement;
    keys: {
        [index: string]: boolean;
    };
    listeners: {
        [index: string]: KeyCallback[];
    };
    constructor(element: HTMLElement);
    private addListeners;
    /**
     * Determines wether or not a key is currently pressed.
     *
     * @see [Key Codes](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/code)
     *
     * @param code The key code to check
     * @returns Wether or not the key corresponding to the given code is pressed.
     */
    isPressed(code: string): boolean;
    /**
     * Emulates a keydown/keyup event on the pages body for a given key code.
     *
     * @see [Key Codes](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/code)
     *
     * @param code The key code to emulate
     * @param pressed When true a `keydown` event is emulated otherwise `keyup` is emulated
     */
    setKey(code: string, pressed: boolean): void;
    /**
     * Attaches a listener to a given key code that is called whenever the state of the key changes.
     *
     * @param code The key code to attach the listener to
     * @param cb The callback to execute on a keydown/keyup event
     */
    addListener(code: string, cb: KeyCallback): void;
    /**
     * Removes a listener from a given key code.
     *
     * @param code The key code the listener is attached to
     * @param cb The attached listener
     */
    removeListener(code: string, cb: KeyCallback): void;
}