​​Hegel: advanced type-checker for #js

Features:
- No Runtime TypeErrors: Hegel targets to prevent runtime TypeErrors by strong type system, great type inference and notify you about corner cases
- Easily Integrated: Hegel is only JavaScript with types, so you don't need to use specific file extensions or comments to start working with it
- Community-friendly
Hegel is developing by community for community. So, your PRs and issues will not be ignored or skipped.

There's also an online playground. Check it out!

https://jsmonk.github.io/hegel/