text: import { app, html } from 'https://unpkg.com/apprun/dist/apprun-html.esm.js';
  const add = (state, delta) => state + delta;
  const view = state => {
    return html`<div>
      <h1>${state}</h1>
        <button @click=${run(add, -1)}>-1</button>
        <button @click=${run(add, +1)}>+1</button>
      </div>`;
  };
  app.start(document.body, 0, view);