Use TypeScript, it has come a very long way since it was released. It tracks very closely to JavaScript and it has an active community, shared types for libraries, and great editor support (VSCode and others). Using maximum strictness and tslint you can pretty much vaporize most of the bugs that Crockford warned about without even running your code.

https://basarat.gitbooks.io/typescript/content/docs/getting-... (ssl cert expired today -_-)