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Rich and I chatted a bit about TS vs JSDoc for library authors today on the monthly dev vlog: https://www.youtube.com/live/MJHO6FSioPI?feature=share&t=95

TL;DR - Svelte's codebase will move to JSDoc types but still use TS.

To be clear - Svelte will still have full support for TS, nothing is changing for users of Svelte.

Why adopt the inferior way of declaring types?

I just don’t get the issues. TS is great, and generating good types directly from TS is easy with API extractor[0]. It makes it so easy.

The resistance to me from the community boggles me and I’m sad Rich feels this way

It's not about generating types though. The reasons are laid out in the video.