fix!: remove resolve.dedupe

Author: sapphi-red

packages/plugin-react/CHANGELOG.md

@@ -2,6 +2,12 @@
 
 ## Unreleased
 
+### `react` and `react-dom` is no longer added to [`resolve.dedupe`](https://vite.dev/config/#resolve-dedupe) automatically
+
+Adding values to `resolve.dedupe` will force Vite to resolve them in a different way than Node.js does, which is confusing and may not be expected. This plugin no longer adds `react` and `react-dom` to `resolve.dedupe` automatically.
+
+If you encounter an error after upgrading, check the `dependencies` / `devDependencies` in `package.json` and the package manager's configuration. If you want the previous behavior, you can add `react` and `react-dom` to `resolve.dedupe` manually.
+
 ## 4.7.0 (2025-07-18)
 
 ### Add HMR support for compound components ([#518](https://github.com/vitejs/vite-plugin-react/pull/518))

packages/plugin-react/src/index.ts

@@ -364,9 +364,6 @@ export default function viteReact(opts: Options = {}): Plugin[] {
       optimizeDeps: {
         include: dependencies,
       },
-      resolve: {
-        dedupe: ['react', 'react-dom'],
-      },
     }),
     resolveId: {
       filter: { id: exactRegex(runtimePublicPath) },