Conditional uglifier to skip optimization on specific files

conditional_uglifier.rb

# in config/environments/production.rb

require 'ext/conditional_uglifier'

# Compress JavaScripts and CSS.
config.assets.js_compressor = ConditionalUglifier.new



# in lib/ext/conditional_uglifier.rb

class ConditionalUglifier < Uglifier
  def really_compile(source, generate_map)
    # Skip any optimization (e.g. for shims)
    if source =~ /^\/\/= skip/
      source.gsub!(/\/\/= ?skip(\n)*;(\n)*\z/, "")
    else
      super
    end
  end
end


# An example of shims.js
//= skip
//= require shims/classList.min
//= require shims/raf.min
//= require shims/weakmap.min