Actionable warning for Your build is slower because some babel plugins are non-serializable?

Hi. When building a fresh app with ember-test-selectors installed, I get the following warning:

[ConfigLoader]WARNING: Your build is slower because some babel plugins are non-serializable

I could have created an issue over at ember-test-selectors to see if this is easily fixable from there. However, I am not completely sure how useful this message itself would be for them.

Would it make sense to provide some actionable best-practices we could link to for ember-addons to be non-“non-serializable”?

[ef4]

is there something that addons could be doing to make it so that Embroider does know where the transforms are coming from?

The addons were already doing what ember-cli-htmlbars supports, but embroider didn’t understand that. This should fix it: https://github.com/embroider-build/embroider/pull/754

[ef4]

Specifically for ember-test-selectors, you can manually tell Embroider where to find its plugins like this:

return compatBuild(app, Webpack, {
    pluginHints: [
      {
        resolve: [
          'ember-test-selectors/transform-test-selector-params-to-hash-pairs',
        ],
      },
      {
        resolve: ['ember-test-selectors/strip-test-selectors'],
      },
    ],
  });