If you want something that is similar but looks better and more mature, check out Mint (mint-lang.com - I'm the author)
I'm giving it a look but I can't really figure out much about the type system and how does it compare to TypeScript.
- TypeScript syntax comparison is here: https://mint-lang.com/from/typescript
- The feature matrix which compares languages features is here: https://mint-lang.com/feature-matrix
I hope you find those helpful :)