class Sprockets::UnloadedAsset

Returns UnloadedAsset.

overriding methods such as `stat` in the `PathUtils` module.
since, for some strange reason, memoization is provided by
is being invoked). We also need for the `file_digest` method,
We need it so we know where the +root+ (directory where sprockets
env - The current "environment" that assets are being loaded into.
"file:///Path/app/assets/js/app.js?type=application/javascript"
and full path such as
uri - A String containing complete URI to a file including scheme

Internal: Initialize object for generating cache keys

def initialize(uri, env)
  @uri               = uri.to_s
  @env               = env
  @compressed_path   = URITar.new(uri, env).compressed_path
  @params            = nil # lazy loaded
  @filename          = nil # lazy loaded
end