The **rollup-plugin-polyfill-node** package provides modern, community‑maintained polyfills for Node.js built‑in modules (e.g., `process`, `stream`, `path`, `buffer`, etc.) so they can be used in Rollup bundles targeting browsers or other non‑Node environments. It’s aimed at front‑end developers and library authors who need to import Node core APIs in projects built with Rollup (including Snowpack and similar toolchains).