add babel runtime check

babel.config.js

@@ -89,8 +89,8 @@ module.exports = function getBabelConfig(api) {
       '@babel/plugin-transform-runtime',
       {
         useESModules,
-        // any package needs to declare 7.4.4 as a runtime dependency. default is ^7.0.0
-        version: '^7.4.4',
+        // any package needs to declare 7.25.0 as a runtime dependency. default is ^7.0.0
+        version: process.env.MUI_BABEL_RUNTIME_VERSION || '^7.25.0',
       },
     ],
     [

scripts/build.mjs

@@ -5,6 +5,7 @@ import path from 'path';
 import { promisify } from 'util';
 import yargs from 'yargs';
 import { hideBin } from 'yargs/helpers';
+import * as fs from 'fs/promises';
 import { getWorkspaceRoot } from './utils.mjs';
 
 const exec = promisify(childProcess.exec);
@@ -27,10 +28,21 @@ async function run(argv) {
     );
   }
 
+  const packageJsonPath = path.resolve('./package.json');
+  const packageJson = JSON.parse(await fs.readFile(packageJsonPath, { encoding: 'utf8' }));
+
+  const babelRuntimeVersion = packageJson.dependencies['@babel/runtime'];
+  if (!babelRuntimeVersion) {
+    throw new Error(
+      'package.json needs to have a dependency on `@babel/runtime` when building with `@babel/plugin-transform-runtime`.',
+    );
+  }
+
   const env = {
     NODE_ENV: 'production',
     BABEL_ENV: bundle,
     MUI_BUILD_VERBOSE: verbose,
+    MUI_BABEL_RUNTIME_VERSION: babelRuntimeVersion,
   };
   const babelConfigPath = path.resolve(getWorkspaceRoot(), 'babel.config.js');
   const srcDir = path.resolve('./src');