drupal/core/vendor/kriswallsmith/assetic/package.json

{
  "devDependencies": {
    "uglifycss": "*",
    "coffee-script": "*",
    "stylus": "*",
    "ember-precompile": "*",
    "typescript": "*",
    "less": "*",
    "handlebars": "*",
    "uglify-js": "*"
  }
}