Parse error when use stylus as css preprocessor

[gaconkzk]

Setting up a riot project using rollup and stylus css preprocessor, seem the compiler put wrong css code into registerPreprocessor function.

Repository for error reproduce: https://github.com/gaconkzk/fliesml
(gaconkzk/fliesml@4e904c7)

Error:

Expect behavior: The parameter code in registerPreprocessor should have \n in them
Actual: All \n characters was remove so the stylus parser can't parse.

[GianlucaGuarini]

@gaconkzk you are absolutely right, that's a bug. The css output shouldn't be compressed before going through the compilers. I will need to patch these lines and it should be a trivial fix https://github.com/riot/compiler/blob/master/src/generators/css/index.js#L102-L103

[gaconkzk]

It worked. Thanks.