Upgrade to Yarn Berry

bin/shakapacker-dev-server

@@ -2,6 +2,9 @@
 
 ENV["RAILS_ENV"] ||= "development"
 ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile", __FILE__)
+# Enable the `package_json` gem to allow the use scripts defined in `package.json`.
+# See https://github.com/shakacode/shakapacker/issues/371
+ENV["SHAKAPACKER_USE_PACKAGE_JSON_GEM"] ||= "true"
 
 require "bundler/setup"
 require "shakapacker"