You can have a look at JSGiven's own report
It can be used with your favorite assertion library (like ChaiJS, Jasmine), or your framework's assertion library.
It aims to provide the most comfortable developer experience with ES6 class syntax, and optional FlowType or TypeScript typings.
Some features are missing, but the folks at https://www.fluo.com are already using it daily.
Don't hesitate to give any feedback and to open a GitHub issue https://github.com/jsGiven/jsGiven/issues