Suggestion: Add pre-processors for <style>

[sxzz]

I made a very initial version to support Less.
I think repl can add an option about custom file extension transformer.
Or we can just support less transform in repl.

I can create an PR for it if you agree with the suggestion.

/cc @yyx990803

[yyx990803]

A store option for additional transforms per file type sounds fine with me.

[hunter2009pf]

I made a very initial version to support Less. I think repl can add an option about custom file extension transformer. Or we can just support less transform in repl.

I can create an PR for it if you agree with the suggestion.

/cc @yyx990803

so how to support LESS, SASS and SCSS in repl? is there any good solution?