gistfile1.js

function handleClick(element, event) {
  if (event.button === 1) {
    return { count: 0 };
  }
  if (element.props.onClick) {
    element.onClick();
  }
  element.updateState(s => {...s, count: s.count + 1 });
}

export function render(element) {
  return (
    <div>
      Clicked {element.state.count} times
      <button onClick={handleClick} style={{ width: element.props.width }} />
    </div>
  );
}