https://medium.com/hackernoon/becoming-fully-reactive-an-in-depth-explanation-of-mobservable-55995262a254 https://dev.to/ryansolid/building-a-reactive-library-from-scratch-1i0p https://github.com/paoloricciuti/sprinkle-js https://www.sprinkle-js.com/ sveltejs/svelte#12287