AMD modules (the name of the types of modules that RequireJS and other loaders, there were multiple competitors) were very much a thing. (Still are in the ArcGI

AMD modules (the name of the types of modules that RequireJS and other loaders, there were multiple competitors) were very much a thing. (Still are in the ArcGIS world that bet heavily on ancient framework Dojo and will take years still to migrate to ESM. Though luckily for them they get to skip CommonJS altogether.) Bundlers made people forget the pains but also the useful lessons of AMD modules.