I learned about this project by YDKJS author Kyle Simpson in the latest episode of JavaScript Jabber[1]. A few folks on the episode, Kyle included, seemed to hold a somewhat negative view of TypeScript, since they seem to like JS's dynamic typing (note, I do too), as well as other some other reasons they go into in the episode.

Kyle mentioned this project he's been working on (Github[2]) which aims to add type checking at both compile time and runtime. Curious what you all think about this project, and its merits of downsides over vanilla JS or TypeScript.

[1] https://devchat.tv/js-jabber/jsj-438-you-dont-know-js-yet-wi...

[2] https://github.com/getify/TypL