[arenaninja]

I disagree with this.

Regarding the "any" type, it's a crutch to migrate existing codebases that started out without Typescript. Every team I've been on I advocate against using it in production code; some teams are better about this than others but it's up to the team how lax or strict their implementation is

As for runtime type checking, Typescript has not set out to replace the JS runtime. JS remains the lingua franca for dynamic content on the web, Typescript can help you write it better and incur virtually no overhead from it by compiling to plain JS. When I worked with financial applications we followed the strictest typing we knew to implement and in my time there (2.5 years) we had zero runtime bugs. It's a great tool and it works