CSS content generated by less/stylus preprocessor will serve content-type: application/javascript

the css content was process with preprocessor, such as karma-less-preprocessor
karma/lib/preprocessor takes '.js' as suffix of file.contentPath in line 63.
karma/lib/middleware/common line 39, mime.lookup with file.contentPath
as the result of above, a requestUrl like /base/css/a.css, the content-type will response as 'application/javascript'

i'll send a pull request to fix it.

Yep, we should use file.path (which is the path that the file is being served under).

I actually already changed that in my local branch (while working on caching of the preprocessed files to save FS access).

ok, i'm waiting for ur latest release on npm.

fix(preprocess): set correct extension for the preprocessed path

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