This example renders the text “hello world” as a simple React component. The `Text` component returns an HTML heading element displaying the provided prop, and the `App` component passes the string `"hello world"` to it. The visualization uses React 16.9 and ReactDOM to mount the component into the DOM, with D3 v5 loaded but not actively employed in the visible code. No data transformations, scales, or D3-specific APIs appear in the source files.