Webpack 5 generated pack do not execute code when loaded on HTML page

[mildred]

I have a probably simple question but I cannot figure out the problem. I moved from webpack 4 to webpack 5 in a Rails application, and now, when I load the javascript module from the HTML page, the code is no longer executed.

The webpack configuration contains:

{
  "output": {
    "filename": "js/[name]-[contenthash].js",
    "chunkFilename": "js/[name]-[contenthash].chunk.js",
    "hotUpdateChunkFilename": "js/[id]-[hash].hot-update.js",
    "path": "/absolute/path/to/public/packs",
    "publicPath": "/packs/"
  },
  "entry": {
    "application": [
      "/absolute/path/to/app/webpack/packs/application.js",
      "/absolute/path/to/app/webpack/packs/application.scss"
    ]
  },
  ...
}

When I inspect and debug the generated /packs/js/application-5fb7bb797c21e44c763b.js file, I see that my application code (the main code in app/webpack/packs/application.js) is inside but wrapped as it is waiting to be loaded as a module, and it is never called.

Why is webpack not executing the main module?

I suspect that has to be with chunking the code in multiple files, and the generated files should only declare the modules and not execute them, but here it is my main module and I need to execute it.

Thank you