Rake::Pipeline with multiple package inputs for an Ember project

Assetfile

require 'rake-pipeline-web-filters'

# package js
input 'packages/emberjs/dist', 'ember.js'
input 'packages/package_A'
input 'packages/package_B'

# project js
input 'lib'

input 'sass', 'main.scss'

output 'assets'

# Take all JS inputs and wrap each of them in code to
# register them with the Minispade module loader.
match '*.js' do
  filter Rake::Pipeline::Web::Filters::MinispadeFilter
  filter Rake::Pipeline::ConcatFilter, 'app.js'
end

# Take all SCSS inputs and compile them with Sass
match 'main.scss' do
  filter Rake::Pipeline::Web::Filters::SassCompiler
end

main.scss

// package styles
@import '../packages/package_A/sass/layout';
@import '../packages/package_B/sass/typography';

// project styles
@import 'color';
@import 'layout';
@import 'typography';