Signals.jl

[TsurHerman]

Very impressive work!!

Have you looked into Signals.jl for (minimal recalculation) reactivity?

I had something like Pluto.jl in mind when I wrote Signals.jl, envisioning even debugging options
where you can enter a function
and it will be displayed like a sub Pluto notebook, with all its internal calculation laid out and amendable for changes.

And one final thought regarding reactivity:
I think notebooks like Pluto.jl should have a top-level section, for type definition and import/using statements, and a code section for statements functions etc

code section changes are handled through whatever reactivity engine you use, cheap minimal and fast, but top-level changes require a reset (new module maybe ... might leak memory ?)