persistent mapbox markers MCVE

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';
import { tracked } from '@glimmer/tracking';
import 'mapbox-gl';

const center = {lng: 79.3832, lat: 43.6532};

function generateModel() {
  return Array(3).map(pt => ({
    lng: center.lng + Math.random() / 10,
    lat: center.lat + Math.random() / 10
  }));
}

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
  center = center;
  @tracked model = generateModel();
  @action
	replaceModel() {
    this.model = generateModel();
  }
}

routes.application\.js

import Route from '@ember/routing/route';

export default Route.extend({
  beforeModel() {
    window.define('mapbox-gl', function() {
      return window.mapboxgl;
    });
  }
});

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
{{#mapbox-gl
	initOptions=(hash center=this.center)
  as |map|
}}
	{{#each this.model as |m i|}}
		<map.marker @lngLat={{m}} @initOptions={{hash anchor="bottom"}} as |marker|>
            {{i}}
            </map.marker>
            {{/each}}
{{/mapbox-gl}}

<button {{on 'click' this.replaceModel}}>Replace model</button>
{{outlet}}
<br>
<br>

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "ENV": {
    "mapbox-gl": {
      "accessToken": "pk.eyJ1IjoiZ2FicmllbGdyYW50IiwiYSI6ImNrYmF6ZmhocjB0MzAydG52NGpyNnBtaGQifQ.SuNqxcOJ31V77p6NrZaAaQ"
    }
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1",
    "mapbox-gl": "https://cdnjs.cloudflare.com/ajax/libs/mapbox-gl/1.11.0-beta.1/mapbox-gl-dev.js"
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "ember-mapbox-gl": "1.0.1"
  }
}