babel-plugin-transform-inline-environment-variables is a Babel plugin that replaces references to process.env variables with their actual values at compile time. This allows for leaner and potentially faster code by eliminating environment variable lookups at runtime. By inlining these values, you can achieve smaller bundle sizes, especially when used with tools like Webpack that leverage dead code elimination to remove unused branches conditional on environment variables. This plugin is beneficial for optimizing front-end applications and streamlining deployment processes.