I would love to see a Svelte-like frontend framework natively designed for Kotlin/Wasm, not necessarily another Kotlin to JavaScript binding that feels like a second class citizen.
This is indeed a very important point, and I care deeply about that.
For Compose for Web, there has been I think a lot of debate to decide if the Web rendering should be Canvas or DOM based. At least for now, it seems the official support is focusing on Canvas rendering for pixel-perfect rendering, and it already works with Koltin/Wasm, see https://twitter.com/bashorov/status/1625437131706363904. This choice is probably driven by Kotlin current mobile app main use case.
Hello world with production artifact and Binaryen optimization produces a 128K Wasm file for now for https://github.com/vmware-labs/wasm-languages/tree/main/kotl..., but the Kotlin/Wasm team has not tracked those data points recently so there are likely footprint regressions to fix. The size should be even smaller. They are going to have a look and also to enable Binaryen by default for production artifacts.
Quite surprised to see no mention of Kotlin here since both languages are very similar, main difference is Swift is LLVM based while Kotlin run on the JVM and has excellent Java interoperability.