TypeScript support can be hit or miss, and there could be more improvements around the stores API
Haven't used Typescript much with it, though.
Beyond that, pretty much every Typescript project I've been introduced to suffers from just as many bugs as codebases that use plain JavaScript. Strict typing at compile time doesn't replace conscientious development practices and rigorous testing.
"view-layer code" is underselling how complex many modern webapps can get. When you've got 10+ engineers across 2+ teams running around in your 30,000+ line codebase, TypeScript offers a lot of benefits and makes overall iteration speed much much faster.
You don't need TypeScript for small/personal projects though. As long as everything fits in your memory, you're fine.
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.
To me JavaScript does a great job (if you know what you are doing) and if you're working on a reasonably small project.
