Original post on babylonjs forum: https://forum.babylonjs.com/t/using-recastjs-on-nodejs-or-browser-in-esm-or-cjs/58709

To work in any context (ESM or CJS) we have to replace

this["Recast"] = Module;

with

globalThis["Recast"]

In recast.js and recast.es6.js

I think this is a breaking change but only for very old browsers.