Counter 예시

단순 Counter 예제
라이브 에디터
const { registViewModel, useViewModel } = xvm;
type CounterState = {
  count: number;
};

type CounterAction = {
  increase: (amount: number) => void;
  decrease: (amount: number) => void;
};
const vm = registViewModel<CounterState & CounterAction>({
  count: 0,
  increase: function (amount) {
    this.count += amount;
  },
  decrease: function (amount) {
    this.count -= amount;
  },
});

const CountAction = () => {
  const [state, send] = useViewModel(vm, ["count"]);

  return (
    <div style={{ display: "flex", gap: "4px" }}>
      <button onClick={() => send("increase", 1)}>+</button>
      <button onClick={() => send("decrease", 1)}>-</button>
    </div>
  );
};

const CountText = () => {
  const [state, send] = useViewModel(vm, ["count"]);
  return <p>Count {state.count}!</p>;
};
render(
  <>
    <CountText />
    <CountAction />
  </>
);
결과