I am using a Github Actions build where in parallel I build JavaScript assets and test them, and also Elixir assets.

For that reason, the project is using the packages published to npmjs.org and not the packages loaded from “deps”. My apps/ui/assets/package.json relevant entries look like this:

  "dependencies": {
    "phoenix": "^1.6.0",
    ...
   "jest": "^27.0.0"
   ...
  }

While the project builds with webpack properly, I have a problem running tests with Jest. it cannot import things from “phoenix” package and crashes like this:

  ● Test suite failed to run

    Cannot find module 'phoenix' from 'js/app/client.js'

    Require stack:
      js/app/client.js
      js/app/notes.js
      js/app/notes.test.js

      1 | import "unfetch/polyfill";
      2 |
    > 3 | import { Socket as PhoenixSocket } from "phoenix";

Version 1.5.9 worked fine in both Jest and with Webpack.

I have tried Node versions 12-16, no change, I think Jest for some reason cannot load “phoenix” package but I don’t understand how to fix this.

Ideas?