const [count, setCount] = createStore({primary: 1})
const memo = createMemo(() => count.primary + 3);
setCount('derived', {
  memoDerived: {
    get get() {
      return memo();
    }
  }
});
count.derived.memoDerived.get

const [count, setCount] = createStore({primary: 1})
const memo = createMemo(() => count.primary + 3);
setCount('derived', {
  memoDerived: {
    get get() {
      return memo();
    }
  }
});
count.derived.memoDerived.get