Example of an uglifyJS filter for rake-pipeline

gistfile1.rb

require "uglifier"
require "rake-pipeline-web-filters"

class UglifyFilter < Rake::Pipeline::Filter
  def initialize()
    super()
  end

  def generate_output(inputs, output)
    inputs.each do |input|
      output.write Uglifier.compile(input)
    end
  end
end

#file shortened

match "**/*.js" do
  filter UglifyFilter
end

Eventually the uglify filter will probably be added with lots of options to the rake-pipeline-web-filters, but for now this works for the basic call.