I've done a project in Dart and another in TypeScript and like them both a lot more than doing straight JavaScript. I appreciate the optional type checking in b

I've done a project in Dart and another in TypeScript and like them both a lot more than doing straight JavaScript. I appreciate the optional type checking in both and the IDE support that each enables. TypeScript is appropriate if your project is more quickly completed with existing libraries like jQuery UI and needs to run on older browsers. Dart is appropriate if you don't need to use older established JS libs and IE9 and above are your target requirements. I like having them both in the toolbox, but I prefer Dart slightly more than TypeScript for various reasons.