fix(react): compat with newer rolldown

Author: sapphi-red

packages/plugin-react/CHANGELOG.md

@@ -6,6 +6,10 @@
 
 SSR applications can now initialize HMR runtime by importing `@vitejs/plugin-react/preamble` at the top of their client entry instead of manually calling `transformIndexHtml`. This simplifies SSR setup for applications that don't use the `transformIndexHtml` API.
 
+### Fix raw Rolldown support for Rolldown 1.0.0-beta.44+ ([#930](https://github.com/vitejs/vite-plugin-react/pull/930))
+
+Rolldown 1.0.0-beta.44+ removed the top-level `jsx` option in favor of `transform.jsx`. This plugin now uses the `transform.jsx` option to support Rolldown 1.0.0-beta.44+.
+
 ## 5.0.4 (2025-09-27)
 
 ### Perf: use native refresh wrapper plugin in rolldown-vite ([#881](https://github.com/vitejs/vite-plugin-react/pull/881))

packages/plugin-react/package.json

@@ -59,7 +59,7 @@
     "babel-plugin-react-compiler": "19.1.0-rc.3",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
-    "rolldown": "1.0.0-beta.43",
+    "rolldown": "1.0.0-beta.44",
     "tsdown": "^0.15.8"
   }
 }

packages/plugin-react/src/index.ts

@@ -225,8 +225,11 @@ export default function viteReact(opts: Options = {}): Plugin[] {
     },
     options(options) {
       if (!runningInVite) {
-        options.jsx = {
-          mode: opts.jsxRuntime,
+        // @ts-expect-error Rolldown has `transform.jsx`
+        options.transform ??= {}
+        // @ts-expect-error Rolldown has `transform.jsx`
+        options.transform.jsx = {
+          runtime: opts.jsxRuntime,
           importSource: opts.jsxImportSource,
         }
         return options