This example shows a minimal React interface with two radio buttons for choosing between “Size” and “Count” factors, though no visible data or chart is rendered. The code imports `React` and `useState`, but the state hook is used outside a component, and a static `App` component returns only the fieldset. It uses React 16.13.1 and ReactDOM to mount the app into the `#root` element, and logs “bacon” to the console.