Replace ember-cli-sass with postcss

[buschtoens]

Would you accept a PR that replaces ember-cli-sass with ember-css-module / postcss? 🙂

The css files would stay almost the same, I'd only have to swap some keywords here and there.

I would like to get rid of the transient binary dependency in our projects.

[kybishop]

@buschtoens are there any differences in final bundle size, or maintenance costs associated with switching over?

[buschtoens]

In theory, both processors should yield pretty much the same output.

Regarding maintenance cost one could argue that you now have to keep track of ember-css-modules and a few postcss plugins as opposed to just ember-cli-sass. In practice this never posed a problem for me though. I'm using quite a bunch of plugins across my projects and can't recall having to modify my css in order to stay compatible with upstream changes.

This "could-be disadvantage" is also one of the big selling points. You're not buying in to a monolithic system controlled by an external power. Instead you include just the parts you really need and could even write your own plugins rather simply—something that's not possible with Sass.

Obviously I'm trying to sway you over here, but in all honesty, I haven't experienced any down sides so far.

[kybishop]

@buschtoens sounds reasonable enough to me. Happy to accept a PR!

[jrjohnson]

FWIW ember-cli-sass v9 now supports Dart which is a JS sass implementation that won't need to be complied so this may not be necessary anymore.