When running vite build with tree-shaking, it's not apparent whether it's working or not.

When setting rollupOptions.treeshake to "smallest", the build results in all program code being removed.

• Check vite.config.js to see whether rollupOptions.treeshake is set to "smallest" or not.
• Run vite build with the above configuration.
• Observe the size of the generated index file.
• Open the generated index file and observe the code.

The build should remove all unused code and the generated index file should be smaller, but not all program code should be removed.

All program code is removed from the generated index file.