vite.config.ts

const externals = {
  react: 'React',
  'react-dom': 'ReactDOM',
  axios: 'axios',
};

export default defineConfig({
  ...
  build: {
    rollupOptions: {
      external: Object.keys(externals),
      ...
    },
    commonjsOptions: {
      ignore: Object.keys(externals),
      esmExternals: Object.keys(externals),
    },
    ...
  },
  optimizeDeps: {
    exclude:  Object.keys(externals), // optional, just excludes for pre-bundling
  },
});