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This looks interesting.

If you want to do declarative 3D and components without Svelte and React though there's always A-Frame or X3D.

I wonder if anyone really wants declarative 3D though. X3D/VRML has been around for 25+ years, and A-Frame for 8 years, and neither have become very popular (and several other formats came and went). Meanwhile three.js and imperative/procedural 3D generally is doing really well. I'm curious as to why that is.

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Declarative 3D in the form of a framework integration for Three.js is extremely popular and I would argue/assume it's currently the most used professional setup for a Three.js site with the most popular one being react-three-fiber. The declarative nature of these frameworks allows for things to be easily reused which forms the basis of an ecosystem.

Frameworks like react-three-fibre are popular because beginners can assemble existing components without knowing much JavaScript at all. It's common to see influencers in the space say things like "build this configurator with only 6 lines of code!" This speed and purported ease of use is what makes these tools so popular, not the declarative nature of the code.

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