Serve assets developed for Sprockets with Mincer

Add karma-sprockets-mincer as a devDependency in your package.json.

{
  "devDependencies": {
    "karma": "",
    "karma-sprockets-mincer": ""
  }
}

or

npm install karma-sprockets-mincer --save-dev

Add the plugin to your config file.

  plugins: [
    'karma-phantomjs-launcher'
    [...]
    'karma-sprockets-mincer'
  ]

Then add sprockets-mincer to the top of the frameworks list (order is important).

frameworks: [
  "sprockets-mincer"
  "jasmine"
]

Next, configure the paths that the Sprockets (Mincer) environment should know about.

sprocketsPaths: [
  'app/assets/javascripts'
  'lib/assets/javascripts'
  'vendor/assets/javascripts'
]

Then, configure the js bundle files that Sprockets should generate. These files will be regenerated whenever a sprockets environment file changes.

sprocketsBundles: [
  'application.coffee'
]

Be sure to also add files listed in sprocketsBundles to config.files in the correct place. sprockets-mincer will replace the pattern in config.files with the one that is compiled.

files: [
  ...
  'application.coffee' # this pattern will be replaced automatically
  ...
]

Optionally configure helpers that the assets might be using.

```coffeescript
sprocketsHelpers:
  asset_path: (fileName) -> return "assets/#{fileName}"

You can also add sprockets paths from RubyGems if you are using this in a Ruby/Rails project.

# "gem-name": ["array of", "sprockets paths"]
rubygems: {
  "rails-widget": ["lib/assets/javascripts", "vendor/assets/javascripts"]
  "jquery-rails": ["vendor/assets/javascripts"]
}

This will run grab the path of the bundled gem by running bundle show and add them with the specified paths to Sprockets/Mincer.