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 optional ES6 syntax, and optional FlowType or TypeScript typings.
Some features are missing, but we are already using it daily at https://www.fluo.com
Don't hesitate to give any feedback and to open a GitHub issue https://github.com/jsGiven/jsGiven/issues
You can start using JsGiven with the user guide https://jsgiven.org/user-guide.html