-One of the main differences between dev and build time is how Vite handles dependencies. During build time, [`@rollupjs/plugin-commonjs`](https://github.com/rollup/plugins/tree/master/packages/commonjs) is used to allow importing CJS only dependencies (like React). When using the dev server, esbuild is used instead to pre-bundle and optimize dependencies, and an inline interop scheme is applied while transforming user code importing CJS deps. During the development of Vite 3, we introduced the changes needed to also allow the use of [esbuild to optimize dependencies during build time](/guide/migration.html#using-esbuild-deps-optimization-at-build-time). [`@rollupjs/plugin-commonjs`](https://github.com/rollup/plugins/tree/master/packages/commonjs) can then be avoided, making dev and build time work in the same way.
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