I think Rich Harris famously migrated Svelte from TypeScript to JSDoc, while still supporting TypeScript via JSDoc. I don’t use Svelte, so I have no idea how well this works in practice. However, Rick Harris seems smart to me, unlike other overly opinionated devs like DHH. I still wouldn’t use JSDoc over TS, but I guess if it works for your project, who cares. What matters is that we all remember the one true enemy, DHH