Your first component

A component is a spec object. create() tags it; render() mounts it.

import { create, render } from "svenjs";

const App = create({
  initialState: { clicks: 0 },
  render() {
    return (
      <button onClick={() => this.setState({ clicks: this.state.clicks + 1 })}>
        {this.state.clicks}
      </button>
    );
  },
});

render(App, document.getElementById("app"));

render must be a method (not an arrow) so this is the instance. this.props and this.state are available while it runs.

The same spec can be used as a child: <App /> creates a new instance each time it is mounted.