var AccessibilityManager = NativeModules.AccessibilityManager;

var VOICE_OVER_EVENT = 'voiceOverDidChange';

var ANNOUNCEMENT_DID_FINISH_EVENT = 'announcementDidFinish';

type ChangeEventName = $Enum<{

change: string,

announcementFinished: string

}>;

var _subscriptions = new Map();

* - `change`: Fires when the state of the screen reader changes. The argument

* to the event handler is a boolean. The boolean is `true` when a screen

* reader is enabled and `false` otherwise.

* - `announcementFinished`: iOS-only event. Fires when the screen reader has

* finished making an announcement. The argument to the event handler is a dictionary

* with these keys:

* - `announcement`: The string announced by the screen reader.

* - `success`: A boolean indicating whether the announcement was successfully made.

*/

addEventListener: function (

eventName: ChangeEventName,

handler: Function

): Object {

var listener = RCTDeviceEventEmitter.addListener(

VOICE_OVER_EVENT,

handler

);

var listener;

if (eventName === 'change') {

listener = RCTDeviceEventEmitter.addListener(

VOICE_OVER_EVENT,

handler

);

} else if (eventName === 'announcementFinished') {

listener = RCTDeviceEventEmitter.addListener(

ANNOUNCEMENT_DID_FINISH_EVENT,

handler

);

}

_subscriptions.set(handler, listener);

return {

remove: AccessibilityInfo.removeEventListener.bind(null, eventName, handler),

AccessibilityManager.setAccessibilityFocus(reactTag);

},

/**

* iOS-Only. Post a string to be announced by the screen reader.

*/

announceForAccessibility: function(

announcement: string

): void {

AccessibilityManager.announceForAccessibility(announcement);

},

/**

* Remove an event handler.

*/