[code-infra] Fix type resolution for @mui/types

packages/mui-types/package.json

@@ -5,10 +5,6 @@
   "author": "MUI Team",
   "description": "Utility types for MUI.",
   "types": "./index.d.ts",
-  "files": [
-    "index.d.ts",
-    "OverridableComponentAugmentation.ts"
-  ],
   "keywords": [
     "react",
     "react-component",
@@ -26,18 +22,26 @@
   },
   "homepage": "https://github.com/mui/material-ui/tree/master/packages/mui-types",
   "scripts": {
-    "build": "mkdir build && cpy index.d.ts build/ && cpy OverridableComponentAugmentation.ts build/ && pnpm build:copy-files",
+    "build": "pnpm build:modern && pnpm build:node && pnpm build:stable && pnpm build:types && pnpm build:copy-files",
+    "build:modern": "node ../../scripts/build.mjs modern",
+    "build:node": "node ../../scripts/build.mjs node",
+    "build:stable": "node ../../scripts/build.mjs stable",
+    "build:types": "tsx ../../scripts/buildTypes.mts",
     "build:copy-files": "node ../../scripts/copyFiles.mjs",
     "prebuild": "rimraf build",
     "release": "pnpm build && pnpm publish",
     "test": "echo 'No runtime test. Type tests are run with the `typescript` script.'",
-    "typescript": "tsc -p tsconfig.json"
+    "typescript": "tsc -p tsconfig.json",
+    "attw": "attw --pack ./build --exclude-entrypoints esm modern"
   },
   "sideEffects": false,
   "publishConfig": {
     "access": "public",
     "directory": "build"
   },
+  "dependencies": {
+    "@babel/runtime": "^7.26.9"
+  },
   "devDependencies": {
     "@mui/types": "workspace:*",
     "@types/react": "^19.0.10"

packages/mui-types/index.spec.ts → packages/mui-types/src/index.spec.ts

@@ -1,4 +1,4 @@
-import { expectType } from '@mui/types';
+import { expectType } from 'packages/mui-types/src';
 
 function expectTypeTypes() {
   // it rejects assignability to `any`

packages/mui-types/index.d.ts → packages/mui-types/src/index.ts

@@ -84,7 +84,9 @@ export type IfEquals<T, U, Y = unknown, N = never> =
  * This means `typeof value` is not identical to `number | string`
  * @param actual
  */
-export function expectType<Expected, Actual>(actual: IfEquals<Actual, Expected, Actual>): void;
+export declare function expectType<Expected, Actual>(
+  actual: IfEquals<Actual, Expected, Actual>,
+): void;
 
 /**
  * A component whose root component can be controlled via a `component` prop.

packages/mui-types/tsconfig.build.json

@@ -0,0 +1,15 @@
+{
+  // This config is for emitting declarations (.d.ts) only
+  // Actual .ts source files are transpiled via babel
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "composite": true,
+    "declaration": true,
+    "noEmit": false,
+    "emitDeclarationOnly": true,
+    "outDir": "build/esm",
+    "rootDir": "./src"
+  },
+  "include": ["./src/**/*.ts*"],
+  "exclude": ["src/**/*.spec.ts*", "src/**/*.test.ts*"]
+}

packages/mui-types/tsconfig.json

@@ -1,4 +1,5 @@
 {
   "extends": "../../tsconfig.json",
-  "exclude": ["OverridableComponentAugmentation.ts"]
+  "include": ["src/**/*", "test/**/*"],
+  "exclude": ["src/OverridableComponentAugmentation.ts"]
 }

packages/mui-utils/tsconfig.build.json

@@ -12,5 +12,6 @@
     "types": ["react", "node"]
   },
   "include": ["src/**/*.ts"],
-  "exclude": ["src/**/*.test.ts*", "src/**/*.spec.ts*"]
+  "exclude": ["src/**/*.test.ts*", "src/**/*.spec.ts*"],
+  "references": [{ "path": "../mui-types/tsconfig.build.json" }]
 }

scripts/build.mjs

@@ -30,7 +30,7 @@ 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'];
+  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`.',

tsconfig.json

@@ -29,7 +29,7 @@
       "@mui/styles/*": ["./packages/mui-styles/src/*"],
       "@mui/system": ["./packages/mui-system/src"],
       "@mui/system/*": ["./packages/mui-system/src/*"],
-      "@mui/types": ["./packages/mui-types"],
+      "@mui/types": ["./packages/mui-types/src"],
       "@mui/private-theming": ["./packages/mui-private-theming/src"],
       "@mui/private-theming/*": ["./packages/mui-private-theming/src/*"],
       "@mui/base": ["./packages/mui-base/src"],