This example demonstrates asynchronous data loading in a React application using D3. It fetches a CSV file from Google Sheets and displays the file’s size in kilobytes, row count, and column count as text on the screen. The code uses the `useState` and `useEffect` hooks to manage the loading state and calls `d3.csv` to parse the remote data. React renders the resulting summary message via `ReactDOM.render`, with a simple `<pre>` element showing “loading…” until the data arrives.