Merge pull request #26898 from Tobbe/tobbe-react-19

React: Support v19 in `react-dom-shim`
(cherry picked from commit 34f0c20)

code/lib/react-dom-shim/src/preset.ts

@@ -6,7 +6,7 @@ import { readFile } from 'fs/promises';
  * Get react-dom version from the resolvedReact preset, which points to either
  * a root react-dom dependency or the react-dom dependency shipped with addon-docs
  */
-const getIsReactVersion18 = async (options: Options) => {
+const getIsReactVersion18or19 = async (options: Options) => {
   const { legacyRootApi } =
     (await options.presets.apply<{ legacyRootApi?: boolean } | null>('frameworkOptions')) || {};
 
@@ -24,11 +24,11 @@ const getIsReactVersion18 = async (options: Options) => {
   }
 
   const { version } = JSON.parse(await readFile(join(reactDom, 'package.json'), 'utf-8'));
-  return version.startsWith('18') || version.startsWith('0.0.0');
+  return version.startsWith('18') || version.startsWith('19') || version.startsWith('0.0.0');
 };
 
 export const webpackFinal = async (config: any, options: Options) => {
-  const isReactVersion18 = await getIsReactVersion18(options);
+  const isReactVersion18 = await getIsReactVersion18or19(options);
   if (isReactVersion18) {
     return config;
   }
@@ -46,7 +46,7 @@ export const webpackFinal = async (config: any, options: Options) => {
 };
 
 export const viteFinal = async (config: any, options: Options) => {
-  const isReactVersion18 = await getIsReactVersion18(options);
+  const isReactVersion18 = await getIsReactVersion18or19(options);
   if (isReactVersion18) {
     return config;
   }