here’s an example snippet from brunch config for two files which use different dependencies:

joinTo: {
        "js/app.js": /(^src\/|^node_modules\/(?!(bootstrap|trumbowyg)))/,
        "js/admin.js": /(^admin\/|^node_modules\/process\/|^node_modules\/trumbowyg\/|^node_modules\/bootstrap\/|^node_modules\/phoenix_html\/)/,
      }
...
modules: {
    autoRequire: {
      "js/app.js": ["src/index"],
      "js/admin.js": ["admin/index"],
    }
  },

edit: the src/index and admin/index map to source files assets/src/index.js and assets/admin/index.js which import needed modules

It turns out that there is an alternative to joinTo which is called entryPoints, which will follow all requires (and imports and other ways of including files), which is exactly what I was looking for.

Thank you very much!

These dependencies are needed as far as I remember for the separation between the compiled files. Try it without them and see if you have a need for more separation.

It’s been some time since I set these things up so I can’t give you exact explanation of what’s what and for what purpose