module Sprockets::Server

def javascript_exception_response(exception)
  err  = "#{exception.class.name}: #{exception.message}\n  (in #{exception.backtrace[0]})"
  body = "throw Error(#{err.inspect})"
  [ 200, { "Content-Type" => "application/javascript", "Content-Length" => body.bytesize.to_s }, [ body ] ]
end