rxjs (see M. Kerjean's sibling comment for an example) or mobx/mobx-state-tree can be used to implement something like that, and I've quite enjoyed both react+m

rxjs (see M. Kerjean's sibling comment for an example) or mobx/mobx-state-tree can be used to implement something like that, and I've quite enjoyed both react+mobx and lit+mobx as a result. (googling 'thing mobx' where 'thing' is your preferred rendering system has results in quite a lot of cases)