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const express = require('express');
const { html, Component } = require('htm/preact');
const renderToString = require('preact-render-to-string');

class App extends Component {
  render(props) {
    return html`
      <div class="app">
        <h1>This is an app</h1>
        <p>Current server time: ${new Date + ''}</p>
      </div>
    `;
  }
}

const app = express();
app.get('/', (request, response) => {
  // render your app to an HTML string
  const body = renderToString(html`<${App} url=${request.url} />`);

  // wrap it in an HTML document and send it back
  response.send(`<!DOCTYPE html><html><body>${body}</body></html>`);
});