# File lib/sprockets/environment.rb, line 17
    def initialize(root = ".")
      @trail = Hike::Trail.new(root)

      self.logger = Logger.new($stderr)
      self.logger.level = Logger::FATAL

      if respond_to?(:default_external_encoding)
        self.default_external_encoding = Encoding::UTF_8
      end

      # Create a safe `Context` subclass to mutate
      @context_class = Class.new(Context)

      # Set MD5 as the default digest
      require 'digest/md5'
      @digest_class = ::Digest::MD5
      @version = ''

      @mime_types        = Sprockets.registered_mime_types
      @engines           = Sprockets.engines
      @preprocessors     = Sprockets.preprocessors
      @postprocessors    = Sprockets.postprocessors
      @bundle_processors = Sprockets.bundle_processors
      @compressors       = Sprockets.compressors

      Sprockets.paths.each do |path|
        append_path(path)
      end

      @engines.each do |ext, klass|
        add_engine_to_trail(ext, klass)
      end

      @mime_types.each do |ext, type|
        @trail.append_extension(ext)
      end

      expire_index!

      yield self if block_given?
    end