feat(onesignal): add new methods

closes #1677

src/@ionic-native/plugins/onesignal/index.ts

@@ -466,6 +466,15 @@ export class OneSignal extends IonicNativePlugin {
   @Cordova({ sync: true })
   endInit(): any { return; }
 
+  /**
+   * Prompt the user for notification permissions. Callback fires as soon as the user accepts or declines notifications.
+   * @returns {Promise<boolean>}
+   */
+  @Cordova({
+    platforms: ['iOS']
+  })
+  promptForPushNotificationsWithUserResponse(): Promise<boolean> { return; }
+
   /**
    * Retrieve a list of tags that have been set on the user from the OneSignal server.
    *
@@ -591,6 +600,13 @@ export class OneSignal extends IonicNativePlugin {
   @Cordova()
   postNotification(notificationObj: OSNotification): Promise<any> { return; }
 
+  /**
+   * Cancels a single OneSignal notification based on its Android notification integer id. Use instead of NotificationManager.cancel(id); otherwise the notification will be restored when your app is restarted.
+   * @param notificationId {string}
+   */
+  @Cordova({ sync: true })
+  cancelNotification(notificationId: string): void {}
+
   /**
    * Prompts the user for location permission to allow geotagging based on the "Location radius" filter on the OneSignal dashboard.
    */
@@ -618,4 +634,31 @@ export class OneSignal extends IonicNativePlugin {
     visualLevel: number
   }): void { }
 
+  /**
+   * The passed in function will be fired when a notification permission setting changes.
+   * This includes the following events:
+   * - Notification permission prompt shown
+   * - The user accepting or declining the permission prompt
+   * - Enabling/disabling notifications for your app in the device Settings after returning to your app.
+   * @return {Observable<any>}
+   */
+  @Cordova({
+    observable: true
+  })
+  addPermissionObserver(): Observable<any> { return; }
+
+  /**
+   * The passed in function will be fired when a notification subscription property changes.
+   * This includes the following events:
+   * - Getting a push token from Apple / Google.
+   * - Getting a player / user id from OneSignal
+   * - OneSignal.setSubscription is called
+   * - User disables or enables notifications
+   * @return {Observable<any>}
+   */
+  @Cordova({
+    observable: true
+  })
+  addSubscriptionObserver(): Observable<any> { return; }
+
 }