gale/app.js

const {DOM} = Gale({
    Button: {
        padding: "20px",
        background: "orange",
        ".Inner": {
            fontSize: "10rem"
        }
    },
    Outline: {
        border: "2px solid orange"
    }
});


/** @typedef {{done:boolean, text:string}} Todo */

/** @type {<T extends object>(obj:T, key:string)=>T} */
const Store =(obj, key)=> {
    const recall = localStorage.getItem(key);
    const store = vanX.reactive(recall ? JSON.parse(recall) : obj);
    van.derive(() => localStorage.setItem(key, JSON.stringify(vanX.compact(store))));
    return store;
}

const items = Store({
  pending:"",
  todos:/** @type {Todo[]}*/([])
}, "Todos?");

const {div, input, button, del, span, a} = van.tags;

const TodoList = () => {
  const inputDom = input({type: "text", value:()=>items.pending, oninput(){items.pending = this.value}});
  return div(
    ()=>div(items.pending),
    inputDom, DOM.button.Outline.Button({onclick: () => items.todos.push({text: inputDom.value, done: false})}, "Add"),
    vanX.list(div, items.todos, ({val: v}, deleter) => div(
      input({type: "checkbox", checked: () => v.done, onclick: e => v.done = e.target.checked}),
      () => (v.done ? del : span)(v.text),
      a({onclick: deleter}, "❌"),
    )),
  )
}

van.add(document.body, TodoList());