This Babel plugin extracts repetitive Babel's helper functions into a single, reusable module. Instead of injecting the same helper code into every file where it's needed, this plugin references them from @babel/runtime. This reduces code duplication and overall bundle size, especially in larger projects. Using @babel/plugin-external-helpers requires @babel/runtime as a dependency. It improves performance and maintainability by centralizing Babel's internal utility functions.