If we mark a package to pre-bundle with optimizeDeps all components from the package must have import React statements even if @vitejs/plugin-react is used.
In this example, @/ui is marked for pre-bundling so that we don't send 4 separate files to the browser. However, when we do this, each component ( Word, Is, Bird ) must have import React statements, otherwise it will throw errors at runtime.
@vitejs/plugin-react should work for packages marked for pre-bundling as well.