refactor!: remove old babel-plugin-react-compiler support

Author: sapphi-red

packages/plugin-react/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Remove old `babel-plugin-react-compiler` support that requires `runtimeModule` option
+
+`runtimeModule` option is no longer needed in newer `babel-plugin-react-compiler` versions. Make sure to use a newer version of `babel-plugin-react-compiler` that supports `target` option.
+
 ## 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

@@ -468,9 +468,6 @@ function getReactCompilerRuntimeModule(
   if (Array.isArray(plugin)) {
     if (plugin[1]?.target === '17' || plugin[1]?.target === '18') {
       moduleName = 'react-compiler-runtime'
-    } else if (typeof plugin[1]?.runtimeModule === 'string') {
-      // backward compatibility from (#374), can be removed in next major
-      moduleName = plugin[1]?.runtimeModule
     }
   }
   return moduleName