// 소스코드 입니다.
        const store = new Store();
        function App() {
            const root = document.createElement('main');
            root.appendChild(Index());
            root.appendChild(Sub());
    
            return root;
        }
        function Index() {
            const root = document.createElement('div');
            root.style.background = 'cyan';
            const renderIndex = () => {
                const [Test, setTest] = store.useState({ test: 'a' });
                const [Test2, setTest2] = store.useState({ test2: 'b' });
                root.innerText = `${Test} : ${Test2}`;
                console.log('인덱스가 렌더링 되었다.');
                root.onclick = () => {
                    setTest('sss');
                    setTest2(Math.random());
                };
            };
            store.watch(renderIndex);
    
            return root;
        }
        function Sub() {
            const root = document.createElement('div');
            store.watch(() => {
                const [Test2, setTest2] = store.useState('test2');
                const [Test3, setTest3] = store.useState({ test3: 'c' });
                root.innerText = `${Test3} : ${Test2}`;
                console.log('서브가 렌더링 되었다.');
                root.onclick = () => {
                    setTest3('공유 되지 않는 상태 변화');
                };
            });
    
            return root;
        }
    
        render(document.querySelector('#app'), App());
    
        function render(root, components) {
            root.appendChild(components);
        }