Embroider compatibility issue (filter)

[22a]

I'm running into an issue where ember-cli-postcss filters aren't being run during app/addon builds.

From playing around with repo config and ember-cli-postcss internals locally I've managed to get pipelines working as expected using a very specific compile setup (instead of the filter we'd like to have the plugins run in) so I suspect the issue could be related to embroider's hook compatibility (discord discussion), namely postprocessTree used here: https://github.com/jeffjewiss/ember-cli-postcss/blob/30c324db5a1686e1657465e98be7783e1f93eb50/index.js#L100-L108

Reproduction: https://github.com/22a/embroider-postcss-addon

The above repo is a freshly bootstrapped addon that just tries to bundle in TailwindCSS using their postcss "at-rule". To reproduce this filter issue locally, see the difference in output between yarn startvs.yarn start:embroider, yarn buildvs.yarn build:embroider, etc.

[jeffjewiss]

Thanks for reporting this.

After reading through some of the docs and spec on embroider it looks like it doesn't currently implement any postprocessTree hooks. The spec has this listed as TBD and other addons seem to require patches to avoid relying on these hooks.

Is there another hook ember-cli-postcss can use when being built with embroider?

I'm not sure if this is a bug with this add-on since it seems like it may be due to embroider not implementing this hook. I'm open to adding support, but it's not clear to me what the path to doing so is.

Cheers

[GCheung55]

How about cross-posting to http://www.github.com/embroider-build/embroider?