module Sprockets::CoffeeScriptProcessor

def self.cache_key
  @cache_key ||= "#{name}:#{Autoload::CoffeeScript::Source.version}:#{VERSION}".freeze
end

def self.call(input)
  data = input[:data]
  js, map = input[:cache].fetch([self.cache_key, data]) do
    result = Autoload::CoffeeScript.compile(data, sourceMap: true, sourceFiles: [input[:source_path]])
    [result['js'], SourceMapUtils.decode_json_source_map(result['v3SourceMap'])['mappings']]
  end
  map = SourceMapUtils.combine_source_maps(input[:metadata][:map], map)
  { data: js, map: map }
end