Alert service using inside https://github.com/jirikavi/AngularJS-Toaster and angular translation package

alert-service.js

(function () {
  'use strict';

  angular
    .module('app')
    .service('alertService', alertService);

  alertService.$inject = ['toaster', '$filter'];

  /* @ngInject */
  function alertService(toaster, $filter) {
    /* jshint validthis: true */
    let vm = this;

    vm.pop = pop;
    vm.success = success;
    vm.error = error;
    vm.info = info;
    vm.showResponseError = showResponseError;

    function pop(data, needTranslate = true) {
      data = prepareData(data, undefined, needTranslate);
      toaster.pop(data);
    }

    function success(data, needTranslate = true) {
      data = prepareData(data, 'ALERT_TITLE_DEFAULT_SUCCESS', needTranslate);
      toaster.success(data);
    }

    function info(data, needTranslate = true) {
      data = prepareData(data, 'ALERT_TITLE_DEFAULT_INFO', needTranslate);
      toaster.info(data);
    }

    function error(data, needTranslate = true) {
      data = prepareData(data, 'ALERT_TITLE_DEFAULT_ERROR', needTranslate);
      toaster.error(data);
    }

    function showResponseError(response, title) {
      for (let key in response) {
        if (response.hasOwnProperty(key) && (response[key] instanceof Array)) {
          for (let i in response[key]) {
            if (response[key].hasOwnProperty(i)) {
              error({
                title: title ? title : 'ALERT_TITLE_DEFAULT_ERROR',
                body: response[key][i]
              });
            }
          }
        } else {
          error({
            title: title,
            body: response[key]
          });
        }
      }
    }

    function prepareData(data, title, needTranslate) {
      if (!(data instanceof Object)) {
        data = {
          body: needTranslate ? $filter('translate')(data) : data,
        }
      }

      data.title = data.title ? data.title : title;
      if (needTranslate) {
        data.title = $filter('translate')(data.title);
        data.body = $filter('translate')(data.body);
      }

      data.bodyOutputType = 'trustedHtml';

      return data;
    }
  }


})();