feat: support new React Compiler target option (#374)

Co-authored-by: Arnaud Barré <[email protected]>

packages/plugin-react/CHANGELOG.md

@@ -2,6 +2,33 @@
 
 ## Unreleased
 
+### React Compiler runtimeModule option removed
+
+React Compiler was updated to accept a `target` option and `runtimeModule` was removed. vite-plugin-react will still detect `runtimeModule` for backwards compatibility.
+
+When using a custom `runtimeModule` or `target !== '19'`, the plugin will not try to pre-optimize `react/compiler-runtime` dependency.
+
+The [react-compiler-runtime](https://www.npmjs.com/package/react-compiler-runtime) is now available on npm can be used instead of the local shim for people using the compiler with React < 19.
+
+Here is the configuration to use the compiler with React 18 and correct source maps in development:
+
+```bash
+npm install react-compiler-runtime
+```
+
+```ts
+export default defineConfig(({ command }) => {
+  const babelPlugins = [['babel-plugin-react-compiler', { target: '18' }]]
+  if (command === 'serve') {
+    babelPlugins.push(['@babel/plugin-transform-react-jsx-development', {}])
+  }
+
+  return {
+    plugins: [react({ babel: { plugins: babelPlugins } })],
+  }
+})
+````
+
 ## 4.3.2 (2024-09-29)
 
 Ignore directive sourcemap error [#369](https://github.com/vitejs/vite-plugin-react/issues/369)

packages/plugin-react/src/index.ts

@@ -237,9 +237,10 @@ export default function viteReact(opts: Options = {}): PluginOption[] {
         // Required for esbuild.jsxDev to provide correct line numbers
         // This crates issues the react compiler because the re-order is too important
         // People should use @babel/plugin-transform-react-jsx-development to get back good line numbers
-        retainLines: hasCompiler(plugins)
-          ? false
-          : !isProduction && isJSX && opts.jsxRuntime !== 'classic',
+        retainLines:
+          getReactCompilerPlugin(plugins) != null
+            ? false
+            : !isProduction && isJSX && opts.jsxRuntime !== 'classic',
         parserOpts: {
           ...babelOptions.parserOpts,
           sourceType: 'module',
@@ -274,8 +275,11 @@ export default function viteReact(opts: Options = {}): PluginOption[] {
   const dependencies = ['react', jsxImportDevRuntime, jsxImportRuntime]
   const staticBabelPlugins =
     typeof opts.babel === 'object' ? opts.babel?.plugins ?? [] : []
-  if (hasCompilerWithDefaultRuntime(staticBabelPlugins)) {
-    dependencies.push('react/compiler-runtime')
+  const reactCompilerPlugin = getReactCompilerPlugin(staticBabelPlugins)
+  if (reactCompilerPlugin != null) {
+    const reactCompilerRuntimeModule =
+      getReactCompilerRuntimeModule(reactCompilerPlugin)
+    dependencies.push(reactCompilerRuntimeModule)
   }
 
   const viteReactRefresh: Plugin = {
@@ -377,21 +381,28 @@ function defined<T>(value: T | undefined): value is T {
   return value !== undefined
 }
 
-function hasCompiler(plugins: ReactBabelOptions['plugins']) {
-  return plugins.some(
+function getReactCompilerPlugin(plugins: ReactBabelOptions['plugins']) {
+  return plugins.find(
     (p) =>
       p === 'babel-plugin-react-compiler' ||
       (Array.isArray(p) && p[0] === 'babel-plugin-react-compiler'),
   )
 }
 
-// https://gist.github.com/poteto/37c076bf112a07ba39d0e5f0645fec43
-function hasCompilerWithDefaultRuntime(plugins: ReactBabelOptions['plugins']) {
-  return plugins.some(
-    (p) =>
-      p === 'babel-plugin-react-compiler' ||
-      (Array.isArray(p) &&
-        p[0] === 'babel-plugin-react-compiler' &&
-        p[1]?.runtimeModule === undefined),
-  )
+type ReactCompilerRuntimeModule =
+  | 'react/compiler-runtime' // from react namespace
+  | 'react-compiler-runtime' // npm package
+function getReactCompilerRuntimeModule(
+  plugin: babelCore.PluginItem,
+): ReactCompilerRuntimeModule {
+  let moduleName: ReactCompilerRuntimeModule = 'react/compiler-runtime'
+  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
 }

playground/compiler-react-18/package.json

@@ -9,15 +9,15 @@
   },
   "dependencies": {
     "react": "^18.3.1",
-    "react-compiler-runtime": "file:./lib/react-compiler-runtime",
+    "react-compiler-runtime": "0.0.0-experimental-8d8e73f-20241009",
     "react-dom": "^18.3.1"
   },
   "devDependencies": {
     "@babel/plugin-transform-react-jsx-development": "^7.24.7",
     "@types/react": "^18.3.10",
     "@types/react-dom": "^18.3.0",
     "@vitejs/plugin-react": "workspace:*",
-    "babel-plugin-react-compiler": "^0.0.0-experimental-b12479e-20240926",
+    "babel-plugin-react-compiler": "0.0.0-experimental-58c2b1c-20241009",
     "typescript": "^5.6.2",
     "vite": "^5.4.8"
   }

playground/compiler-react-18/vite.config.ts

@@ -1,21 +1,14 @@
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
 
-// https://gist.github.com/poteto/37c076bf112a07ba39d0e5f0645fec43
-
 // https://vitejs.dev/config/
 export default defineConfig(({ command }) => {
   return {
     server: { port: 8901 /* Should be unique */ },
     plugins: [
       react({
         babel: {
-          plugins: [
-            [
-              'babel-plugin-react-compiler',
-              { runtimeModule: 'react-compiler-runtime' },
-            ],
-          ],
+          plugins: [['babel-plugin-react-compiler', { target: '18' }]],
         },
       }),
     ],

playground/compiler/package.json

@@ -16,7 +16,7 @@
     "@types/react": "^18.3.10",
     "@types/react-dom": "^18.3.0",
     "@vitejs/plugin-react": "workspace:*",
-    "babel-plugin-react-compiler": "^0.0.0-experimental-b12479e-20240926",
+    "babel-plugin-react-compiler": "0.0.0-experimental-58c2b1c-20241009",
     "typescript": "^5.6.2",
     "vite": "^5.4.8"
   }