App freezes but notifications work

I tried the demo in typescript which ran perfectly. then I tried to run the plugin in javascript. But the page I put the code freezes every time. Everyting else runs smooth. I scheduled recursive notification. I get the permission alert in IOS and also get the recursive notification every moment.

What I have done? tns plugin add nativescript-local-notifications

then on my start-page.js

  var LocalNotifications=require ("nativescript-local-notifications");
  LocalNotifications.schedule([{
    id: 1, // generated id if not set
    title: 'The title',
    body: 'Recurs every minute until cancelled',
    ticker: 'The ticker',
    //color: new Color("red"),
    badge: 1,
    groupedMessages:["The first", "Second", "Keep going", "one more..", "OK Stop"], //android only
    groupSummary:"Summary of the grouped messages above", //android only
    ongoing: true, // makes the notification ongoing (Android only)
    icon: 'res://heart',
    image: "https://cdn-images-1.medium.com/max/1200/1*c3cQvYJrVezv_Az0CoDcbA.jpeg",
    thumbnail: true,
    interval: 'minute',
    channel: 'My Channel', // default: 'Channel'
    sound: "customsound-ios.wav", // falls back to the default sound on Android
    at: new Date(new Date().getTime() + (10 * 1000)) // 10 seconds from now
  }]).then(
      function(scheduledIds) {
        console.log("Notification id(s) scheduled: " + JSON.stringify(scheduledIds));
      },
      function(error) {
        console.log("scheduling error: " + error);
      }
  )

function onLoaded () {
LocalNotifications.schedule ();
}

So when start-page loads I want to schedule the notification. But when I use

var LocalNotifications=require ("nativescript-local-notifications");

app crashes and on console I receive that error

   JavaScript error:
    file:///node_modules/tns-core-modules/ui/builder/builder.js:179:0: JS ERROR Error: Building    UI from XML. @app-root.xml:1:1
   >undefined is not a function (near '...LocalNotifications.schedule...')

when I use

 import { LocalNotifications } from "nativescript-local-notifications";

app run and starts to receive notification as scheduled but my start page freezes. It scrolls up and down but none the tap functions operates. I put the code in different pages to confirm that only the page with the code freezes.

Actually I don't know what happens. Something about typescript-javascript issue? No idea? As new in coding. I must be something simple that I miss.

thx in advance

EddyVerbruggen / nativescript-local-notifications

App freezes but notifications work #168