[jfjfhvhfhfhfhfh]

$ emrun --port 8000 . # Handles WASM; most others don't.[1]

[1] Emscripten's emsdk includes emrun, which actually serves WASM files with the correct MIME type out-of-the-box, unlike the python2 and python3 servers and most others.

[henearkr]

Does emrun allow CORS, required for SharedArrayBuffers?

[capableweb]

CORS is up to the server you're calling, not up to the server hosting the JS code. Any server that supports custom HTTP headers, support CORS. No, SharedArrayBuffers don't require "CORS" (which you probably mean if they work in CORS context rather than "require"). What they do require is a Secure Context (https, localhost or similar) https://developer.mozilla.org/en-US/docs/Web/Security/Secure...

I wonder how come CORS is such a misunderstood concept globally. It's a really simple concept in general, and understanding it will make a lot of your work as a frontend/full stack developer easier. Take a day and fully understand it, it'll pay off.