Initial dead code elimination

[rtsao]

Implemented dead code elimination and updated tests. Fixes #13

I could be missing something in terms of the greater context including css-modulesify/css-modules-require-hook but for the sake of this repo, dead code elimination now works. It is also possible I'm doing something naive, but as far as I can tell everything works.

I basically removed the caching that was previously happening, I probably can trivially put back in some caching in the case of composing the same classes from the same file (but not in the case of different classes from the same file). We probably could also make dead code elimination a configuration option and thus optional if you're worried about compile performance (for example during hot loading).

I intend to clean up the tests a little bit and add some more tests (including comprehensive unit tests for the containsClass function).

This PR contains lint/formatting problems which I intend to fix after #19 is addressed.

[rtsao]

@geelen @joshwnj

[joshwnj]

cool stuff @rtsao ! Will take a closer look and try with css-modulesify, but so far sounds great.

[geelen]

My apologies, I hadn't had a proper chance to look at this yet. Am doing so now.

[joshwnj]

Hey @rtsao sorry for the delay, it's been a busy couple of weeks :) So far from what I can see this is looking good. The only issue I've spotted so far is that animation keyframes aren't being included as expected. I'm seeing this in http://css-modules.github.io/browserify-demo/ if you want to try to repro.

[BinahLinden]

Is this a dead issue? I am also looking for a solution to this

[geelen]

@BinahLinden I'm afraid so. We're hoping to support this again at some point but it's a bigger job than this PR indicates.