class Sprockets::Utils::Gzip

def compress(target)

Returns nothing.

Does not modify the target asset.
the same name plus a `.gz` extension in the same folder as the original.
Compresses the target asset's contents and puts it into a file with

Private: Generates a gzipped file based off of reference asset. 
def compress(target)
  mtime = PathUtils.stat(target).mtime
  PathUtils.atomic_write("#{target}.gz") do |f|
    gz = Zlib::GzipWriter.new(f, Zlib::BEST_COMPRESSION)
    gz.mtime = mtime
    gz.write(@source)
    gz.close
    File.utime(mtime, mtime, f.path)
  end
  nil
end