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> compiles to who knows what

You can easily read the compiled Svelte output and see how each piece of template is wired to the state. There is very little cruft in it, and no real runtime library to speak of.

The debugging experience (not that I have needed it much) is light years ahead compared to going through React's internals.

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Yeah, but it's still a DSL and that means that I can't be sure that everything I can normally do in JS is valid there, and external tooling won't be able to make sense of it without additional work.

Those sounds like very abstract concerns - I haven't had any issues on those lines using Svelte for years now. The $: syntax is actually valid JS (labels) so standard JS tooling should always be able to parse it.

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