Plain JavaScript is the ideal language for AI coding. It's very good with complex architectures.

I think partly it's because the training set contains a lot of JS, but also because complex software written in JavaScript must have impeccable architecture in order to exist at all.

It's rare to encounter a complex, functioning JavaScript application with bad architecture. I've never met any engineer smart enough to maintain a large spaghetti-code JavaScript project.

On the other hand, I've seen horrible TypeScript projects. If it wasn't for the helpful type annotations, no human being would have been able to maintain it.