Adding a package as nil will actually remove the package

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    rack-pack (0.1.0)
+    rack-pack (0.2.1)
       rack (~> 1.2.1)
 
 GEM

lib/rack/pack.rb

@@ -23,9 +23,13 @@ def production?
       end
 
       def add_package(output_file, source_files)
-        public_output_file    = ::File.join(self.options[:public_dir], output_file.to_s)
-        package_class         = Package[output_file]
-        packages[output_file] = package_class.new(public_output_file, source_files)
+        if source_files.nil?
+          packages.delete(output_file)
+        else
+          public_output_file    = ::File.join(self.options[:public_dir], output_file.to_s)
+          package_class         = Package[output_file]
+          packages[output_file] = package_class.new(public_output_file, source_files)
+        end
       end
     end
 

lib/rack/pack/version.rb

@@ -1,5 +1,5 @@
 module Rack
   class Pack
-    VERSION = '0.2.0'
+    VERSION = '0.2.1'
   end
 end

spec/rack/pack_spec.rb

@@ -117,6 +117,18 @@ def request_for(url = '/')
     end
   end
 
+  context 'with a default package set to nil' do
+    it 'should not pack the files' do
+      within_construct do |c|
+        c.file 'vendor/javascripts/file-1.js', '1'
+
+        @app = build_app 'javascripts/application.js' => nil
+        @app.call(request)
+        File.exist?('public/javascripts/application.js').should_not be_true
+      end
+    end
+  end
+
   context 'in a production environment' do
     before do
       Rails = double('rails', :env => double('env', :to_s => 'production'))