/**
 * the default target element for keyboard events (usually the window element in which the game is running)
 */
export declare const keyBoardEventTarget: null;
export declare function initKeyboardEvent(): void;
/**
 * return the key press status of the specified action
 * @param action - user defined corresponding action
 * @returns true if pressed
 * @example
 * if (me.input.isKeyPressed('left')) {
 *    //do something
 * }
 * else if (me.input.isKeyPressed('right')) {
 *    //do something else...
 * }
 * @category Input
 */
export declare function isKeyPressed(action: string): boolean;
/**
 * return the key status of the specified action
 * @param action - user defined corresponding action
 * @returns down (true) or up(false)
 * @category Input
 */
export declare function keyStatus(action: string): boolean;
/**
 * trigger the specified key (simulated) event <br>
 * @param keyCode - (See {@link input.KEY})
 * @param [status=false] - true to trigger a key down event, or false for key up event
 * @param [mouseButton] - the mouse button to trigger
 * @example
 * // trigger a key press
 * me.input.triggerKeyEvent(me.input.KEY.LEFT, true);
 * @category Input
 */
export declare function triggerKeyEvent(keyCode: number, status: boolean, mouseButton?: number): void;
/**
 * associate a user defined action to a keycode
 * @param keyCode - (See {@link input.KEY})
 * @param action - user defined corresponding action
 * @param [lock=false] - cancel the keypress event once read
 * @param [preventDefault=input.preventDefault] - prevent default browser action
 * @example
 * // enable the keyboard
 * me.input.bindKey(me.input.KEY.LEFT,  "left");
 * me.input.bindKey(me.input.KEY.RIGHT, "right");
 * me.input.bindKey(me.input.KEY.X,     "jump", true);
 * me.input.bindKey(me.input.KEY.F1,    "options", true, true);
 */
export declare const bindKey: (keyCode: number, action: string, lock?: boolean, preventDefault?: boolean) => void;
/**
 * return the action associated with the given keycode
 * @param keyCode - (See {@link input.KEY})
 * @returns user defined associated action
 * @category Input
 */
export declare function getBindingKey(keyCode: number): string;
/**
 * unlock a key manually
 * @param action - user defined corresponding action
 * @example
 * // Unlock jump when touching the ground
 * if (!this.falling && !this.jumping) {
 *     me.input.unlockKey("jump");
 * }
 * @category Input
 */
export declare function unlockKey(action: string): void;
/**
 * unbind the defined keycode
 * @param keyCode - (See {@link input.KEY})
 * @example
 * me.input.unbindKey(me.input.KEY.LEFT);
 * @category Input
 */
export declare function unbindKey(keyCode: number): void;
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