Webpack: How to load non module scripts into global scope | window

index.js

// Import or require the module to includes global variables from the lib
import "p5.scenemanager"

my-file.js

// Use the lib

function myFunction() {
    var manager = new window.SceneManager(); 
}

package.json

{
  "script-loader": "^0.7.2",
  "webpack": "^4.41.2",
  "webpack-cli": "^3.3.10",
  "webpack-dev-server": "^3.9.0",
  "webpack-merge": "^4.2.2" 
}

webpack.config.js

/* 
* Uses 'script-loader' npm package to add a JS dependency from node_modules to "window"
* 
* Obs: Using webpack >= 4.0
*
* @see https://medium.com/@yushulx/react-load-global-javascript-library-with-webpack-fa3e1a33d8bc
* @see https://webpack.js.org/guides/shimming/
* @see https://stackoverflow.com/questions/48998102/webpack-how-to-load-non-module-scripts-into-global-scope-window
* @see https://webpack.js.org/configuration/externals/
*/
module.exports = {
  entry: path.resolve(__dirname, 'index.js'),
  module: {
    rules: [
      {
        loader: 'babel-loader',
        exclude: /node_modules/,
        test: /\.js$/
      },
      {
        test: /\.js$/,
        include: path.resolve(__dirname, 'node_modules', 'p5.scenemanager'),
        use: [ 'script-loader' ]
      }
    ],
  }
}