The **rollup-plugin-jsx** package provides a thin Rollup plugin that runs the **jsx‑transform** utility on your source files, letting you compile JSX syntax (e.g., `React.createElement`) during a Rollup build. It was originally created for projects using Buble before Buble added native JSX support, and now mainly serves as a simple example or legacy helper for developers who need custom JSX factory options in their Rollup bundling workflow. Suitable for JavaScript developers building React‑style applications with Rollup who want an easy way to plug in JSX transformation.