@babel/plugin-transform-runtime is a Babel plugin that enables the re-use of Babel's injected helper code to save on code size. It achieves this by referencing the babel-runtime package. This prevents Babel from injecting the same helper functions into every module, reducing duplication and improving overall bundle size. Especially helpful for large projects, it improves performance through code reuse. When using this plugin, ensure @babel/runtime is installed as a project dependency.