mr-crocs-adventures/tilorswift/js/module.js

import Terrain from "./Terrain.js";
import FileLoader from "../../js/FileLoader.js";

let image = new Image();
image.src = '../graphics/tileset-landscape01.jpg';
image.onload = function () {
    console.log('Loaded');

    let loader = new FileLoader('../levels/level.json');
    let terrain = Terrain.createFromJson(loader.getContent());

    document.body.appendChild(terrain.getElement());
};