babel-plugin-polyfill-corejs3 selectively includes only the necessary core-js polyfills based on target environments defined in your Babel configuration. This minimizes bundle size by avoiding unnecessary code. It leverages core-js version 3 and Babel's built-in support for targeting specific browsers or Node.js versions. Ideal for projects aiming for leaner builds and optimal compatibility, ensuring only the required polyfills are included for the intended runtime environments.