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Maël Nison
@mael.dev

For context, I wanted a way to "fork" generators so new iterators could be created at any yield point. Those new iterators had their own stack and could progress without impacting the original iterator (assuming they only had access to immutable data structures).

Maël Nison
@mael.dev

The Next.js workflow stuff is very similar; the difference is that instead of creating the new iterator right away they serialize it. Future forks only need to be restored from that snapshot.

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Maël Nison
@mael.dev

One of the tricky part I faced was that to make this work, you need to turn the function into a state machine. With loops, initializers, etc it's not exactly trivial.