Vite's main focus is on a fast dev server and provide ultra fast hmr. However, it needs source (user code and npm packages) to be in ESM modules, so it uses es

Vite's main focus is on a fast dev server and provide ultra fast hmr. However, it needs source (user code and npm packages) to be in ESM modules, so it uses esbuild for pre bundling npm packages. And vite uses roll-up to create a production build with some parts done by esbuild