npm install --save-dev three-contrib-loader

⚠️ I don't know if threejs core project will change the release mental to correct this inconvenient issue, so this loader is a hot-fix hack and you should watch the threejs project to follow the future change.

import * as THREE from "three";
import * as OrbitControlsFactory from "three/examples/js/controls/OrbitControls";

OrbitControlsFactory(THREE);

// Now, THREE entity should have OrbitControls appended.
let controls = new THREE.OrbitControls();

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        // The delimiter of path fragment of stupid windows has the format "//"
        test: /three.*examples.*js/,
        use: [
          {
            loader: "three-contrib-loader"
          }
        ]
      }
    ]
  }
};