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TodoMVC is the de-facto cross-framework benchmark: every framework — React, Vue, Svelte, Solid, Angular, Elm, even Imba — has an implementation, and the spec is identical. It is small enough to fit in your head and big enough to exercise add / toggle / remove / filter / clear-completed — every primitive most apps actually need.

In this capstone you implement the state machine behind a TodoMVC, without any DOM. Inputs are command lines, outputs are deterministic state dumps. This is exactly the layer you would later wire to a renderer (your own VDOM, React, Solid — pick one).

If your state machine is correct here, you can drop it into any framework's view layer and ship.