PluginService.ts

/**
 * Provides the ability to fetch global plugin objects.
 */
class PluginService {
   static $inject = ['$ionicPlatform', '$window', '$q', '$log'];

   constructor(private $ionicPlatform: ionic.platform.IonicPlatformService,
               private $window: ng.IWindowService,
               private $q: ng.IQService,
               private $log: ng.ILogService) {

   }

   /**
    * Returns a promise that is resolved with the plugin with the given name.
    * @param plugin {string} - The name or path to the plugin.
    * @returns {IPromise<any>} - A promise that is resolved with the plugin.
    */
   public getPlugin(plugin: string): ng.IPromise<any> {
      return this.$ionicPlatform.ready()
         .then(() => {
            var pluginInstance = this.get(this.$window, plugin);
            if(!pluginInstance) {
               this.$log.error('Plugin [' + plugin + '] not found.');
               return this.$q.reject('Plugin [' + plugin + '] not found.');
            }

            return this.$q.resolve(pluginInstance);
         });
   }

   /**
    * Returns the ionic keyboard plugin.
    * @returns {ng.IPromise<any>} - A promise that is resolved with the ionic keyboard plugin.
    */
   public keyboard(): ng.IPromise<any> {
      return this.getPlugin('cordova.plugins.Keyboard');
   }

   private get(window: ng.IWindowService, plugin: string): any {
      var objectPath = plugin.split('.');
      var object = window;
      var pathItem = objectPath.shift();

      while(!!object && !!pathItem) {
         object = object[pathItem];
         pathItem = objectPath.shift();
      }

      return object;
   }
}

angular.module('...')
   .service('$pluginService', PluginService);