Since the OpenSource era beginning, the modern developing environment is built from small and independent pieces. This is our power and our weaknes...
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(From the future here) I'd say Svelte has done a really GREAT JOB at giving user as much freedom as possible:
IMHO its alright for a JavaScript framework to only be compatible with certain tools.
Remember Svelte is a framework founded by an engineer at The NY Times. Svelte was probably first and foremost created to aid in the majority of use cases found in the static content hosted by The NY Times. To that end, Svelte is brilliant. It keeps the size of the bundle down. If your job is coding charts and graphics that have to be viewable on many devices and be extremely performant, vanilla JS is the way to go IMHO. Svelte brings some sanity to that way of working. Official TypeScript support would be nice, but there are probably ways you can still build with TypeScript in your own project.
Well, now you can use svelte-preprocess to use Svelte with PostCSS, SCSS, Less, Stylus, CoffeeScript, TypeScript, Pug and much more, please give it a check to -> github.com/sveltejs/svelte-preprocess it's really cool !!
Also here a short video about more detail about using TypeScript with Svelte -> dev.to/cvng/enable-typescript-in-s...
So, Svelte is OpenSource and OpenSource is freedom, enjoy !! ;) :)