Check:
https://github.com/elbywan/hyperactiv https://github.com/luavixen/Patella
https://github.com/vuejs/core/tree/main/packages/reactivity https://github.com/nx-js/observer-util https://github.com/salesforce/observable-membrane https://github.com/sindresorhus/on-change/tree/main
https://github.com/RisingStack/react-easy-state https://github.com/mseddon/preact-nx-observer
https://github.com/vuejs/core/tree/main/packages/reactivity https://github.com/udamir/mosx