Eh. I agree with the principle. I’ve written personal projects with JSDoc because I truly love the idea of finally being done with build systems and just serving the files I write without a step in between.

But it’s more annoying than just writing TypeScript. There are ways to express just about everything TypeScript can but they’re all more difficult and convoluted (generics are a great example). For a project of any reasonable size I’m still going to advocate to use TypeScript.