I'm just jumping into TypeScript after a decent break from production coding. Prior to this break it was Rails, well before that Java.

In my own Hades moment -- Microsoft know how to build great developer tools. The developer ergonomics of TypeScript and Visual Studio Code are excellent. It's really quite surprising to see how far the JavaScript world has come.

Similarly, the DevOps world is becoming much (much) more JavaScript friendly. Serverless, Netlify, and things like AWS Amplify -- all with their foibles, but pushing JavaScript in meaningful ways. I don't think this is the case for many other languages/ecosystems.