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I wouldn't recommend using this library for all the mentioned reasons. But at sub 60 lines of code, you have all makings of a simple reactive library. And when you consider how many behaviors you can model with it, it should make more sense to you why libraries like Svelte and Solid with a compiler can produce such small bundles.
The reactive library we will build won't have all the features of something like MobX, Vue, or Solid but it should serve as a good example to get a feel for how this works.
And that is the basics. Sure, our library doesn't have batching, custom disposal methods, or safeguards against infinite recursion, and is not glitch-free. But it contains all the core pieces. This is how libraries like KnockoutJS from the early 2010s worked.