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> What about Svelte?

Svelte apps aren't written in JS but in Svelte's own component syntax files. It's "HTML" but all the parts are extended (JS -> reactive, HTML -> directives, CSS -> scoping) and it needs its own compiler to transform the source to something everything else understands.

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That's also true of JSX. The default output of both compilers is just a javascript module.

Yes, but JSX is much more conservative in what it introduces to the language. Other than the XML syntax rest of js is mostly left untouched.

In a svelte file, a lot of usual js constructs like labels, additions, assignments etc. have different semantics making it more work for another language to support it.

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