Basic setup of running Babylon.js NullEngine with server side (node.js) using TypeScript

Questions
6

As explained earlier node-js expects common.js import style until version 14 so no import / export keywords could work before.

In order to convert our import statements, either you could rely on a bundler like webpack/parcel/rollup or you could transpile your files using babel.

Here using babel and babel-node for instance, you can add the following dependencies:

"devDependencies": {
    "@babel/cli": "^7.12.1",
    "@babel/core": "^7.12.3",
    "@babel/node": "^7.12.6",
    "@babel/plugin-transform-modules-commonjs": "^7.12.1",
    "@babel/preset-env": "^7.12.1"
  }

then add a babel.config.js at the root containing:

module.exports = function (api) {
  api.cache(false);

  return {
    presets: [ "@babel/preset-env" ],
    plugins: [ "@babel/plugin-transform-modules-commonjs" ],
  };
}

Now in your start command replace node by babel-node:

"start": "babel-node -i [] dist/index.js",

-i [ ] will help transpiling file from the node_modules folder as well.

But as a general way here using a bundler like you would do for the web might make things easier