Investigate minification of js/css/html during deployment

[jakemac53]

Mangling names would be hard due to the js-interop, but we should be able to save a lot of space by just removing comments and collapsing whitespace. We should do this for html/css/js

[jakemac53]

Whatever solution we use here should also be applied to https://github.com/dart-lang/paper-elements

[Andersmholmgren]

Be nice if there is any way to apply tree shaking to the elements. Remove unused elements etc

[jakemac53]

I agree, but we can't really do that until we have global transformers (see http://dartbug.com/17306). The application is the only thing that knows what it could delete, but it can't delete files in this package.

[zoechi]

Shouldn't it be possible to just run vulcanize or some other JavaScript minification after pub build to achive this?

[jakemac53]

Yes, but it would be nice if we could integrate that into the transformation process, eliminating any extra steps and standardizing how its done.