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Maybe adapting the existing js_of_ocaml project is comparatively easier so they might as well try it.

There is a pretty complete wasm_of_ocaml port to the Eliom web framework here https://github.com/ocsigen/eliom/pull/767

It seems like it’s a relatively easy swap from js_of_ocaml to WASM. That’s the option I’ve chosen for my experiments.

It's the ocaml way.

They are targeting two different intermediate representations in the compiler. wasm_of_ocaml is a fork of js_of_ocaml that consumes OCaml bytecode and emits Wasm instead of JavaScript. Compared to wasocaml that uses the FLambda-based backend for OCaml’s native code compiler.

Time will tell if both survive, they are both under active development. IMHO target different use cases.