Rake Pipeline OrderingConcatFilter by folder

[newtonianb]

How can I specify an entire folder when specifying OrderingConcatFilter?

      match "coffee/**/*.js" do
        filter(
          Rake::Pipeline::OrderingConcatFilter,
          [
            "my/essentials/**/*",
            "my/core/**/*",
          ],
          "libs.js"
        )
      end

I wrote my app in a javascript MVC and the way it works is all the files in that directory need to be loaded before the rest, how can I specify wild characters?