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Great to see work like this being done. Javascript is often a "good enough" language, but an efficient Smalltalk (or Self) language with support for things like system images, become:, coroutines, and other advanced features would open up a lot of advanced programming techniques like fast portable images, transparent futures, cooperative concurrency without async/await on every call, etc.

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On a similar note, you can now run Scheme in the browser via wasm: https://spritely.institute/hoot/

The current release can do coroutines via the delimited continuation support, but the next release will have ready-to-use lightweight threads (aka "fibers") that integrate with JS promises. No async/await marked functions/calls.

As an Obj-C guy, if I declare a method as input only and no return, it can run async in the run loop.

I assume Smalltalk can do the same?

Effect-ts is also built on the same principles (fibers) if one wants to stay in TS land.

https://effect.website/docs/guides/runtime

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