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Relatedly, there is a stage-1 proposal to add first-class signals to Javascript: https://github.com/tc39/proposal-signals

It's a collaboration between multiple library maintainers, attempting to standardize and unify their shared change-tracking approach.

Also some examples in the polyfill README [0]. Certainly looks interesting.

I wonder some years down the future, if there will be no need for JS frameworks since a lot of what they offer will be integrated into JS itself.

Framework authors would love to not do the things they do if the platform provides great APIs and primitives.