Ruby Next Core is a zero deps version of Ruby Next meant to be used as as dependency in your gems. It contains all the polyfills and utility files but doesn't require transpiler dependencies to be install.

Ruby Next is a collection of polyfills and a transpiler for supporting latest and upcoming edge CRuby features in older versions and alternative implementations (such as mruby, JRuby, Opal, Artichoke, RubyMotion, etc.).