I too feel like Emscripten is doing way more than it should for the vast majority of actual use-cases for WASM on the web out there. It's too heavy to install, too much of a hassle to get running, produces way bigger output than it should if the main target is a website, and adds needless friction by being largely oblivious to how the web works from the C++ side of things. The shared memory architecture + batched calls also aligns with hunches I had about unlocking fast WASM for web dev. So this sounds extremely interesting!

Coi looks pretty nice! But honestly I think WebCC might actually be the thing I have been waiting for to unlock WASM on the web. Because if I understand correctly, it would let me write C++ code that compiles to tiny WASM modules that actually integrates with generic JS code very efficiently. Which would make it much easier to add to existing projects where there are some big bottlenecks in the JS code.

Looking forward to giving it a spin!