[infra] Migrate build to tsdown

Author: brijeshb42

package.json

@@ -30,7 +30,7 @@
     "prettier": "pretty-quick --ignore-path .lintignore --branch master",
     "prettier:all": "prettier --write . --ignore-path .lintignore",
     "size:snapshot": "pnpm -F ./test/bundle-size check",
-    "size:why": "pnpm size:snapshot --analyze --accurateBundles",
+    "size:why": "pnpm size:snapshot --analyze",
     "start": "pnpm install && pnpm docs:dev",
     "test": "pnpm test:chromium",
     "test:e2e": "cross-env NODE_ENV=production pnpm test:e2e:build && concurrently --success first --kill-others \"pnpm test:e2e:run\" \"pnpm test:e2e:server\"",
@@ -66,7 +66,7 @@
     "@babel/plugin-transform-react-constant-elements": "^7.27.1",
     "@base-ui-components/monorepo-tests": "workspace:*",
     "@mui/internal-bundle-size-checker": "^1.0.9-canary.34",
-    "@mui/internal-code-infra": "^0.0.2-canary.59",
+    "@mui/internal-code-infra": "https://pkg.pr.new/mui/mui-public/@mui/internal-code-infra@ddb7a74",
     "@mui/internal-docs-utils": "^2.0.1",
     "@mui/internal-markdown": "^2.0.7",
     "@mui/internal-scripts": "^2.0.10",
@@ -129,6 +129,7 @@
     "terser": "^5.43.1",
     "terser-webpack-plugin": "^5.3.14",
     "tsx": "^4.20.4",
+    "tsdown": "^0.14.1",
     "typescript": "^5.9.2",
     "unist-util-visit": "^5.0.0",
     "vite": "^7.1.3",

packages/react/package.json

@@ -72,10 +72,8 @@
   "type": "commonjs",
   "scripts": {
     "prebuild": "rimraf --glob build build-tests \"*.tsbuildinfo\"",
-    "build": "code-infra build --ignore \"**/*.template.js\" && pnpm build:copy-files",
-    "build:stable": "code-infra build --bundle esm --ignore \"**/*.template.js\" --buildTypes false",
-    "build:copy-files": "code-infra copy-files .npmignore",
-    "test:package": "publint --pack pnpm && attw --pack ./build --exclude-entrypoints package.json --exclude-entrypoints esm --exclude-entrypoints cjs",
+    "build": "tsdown && code-infra copy-files",
+    "test:package": "publint --pack pnpm run . && attw --pack ./build --exclude-entrypoints package.json",
     "release": "pnpm build && pnpm publish",
     "test": "cross-env NODE_ENV=test VITEST_ENV=jsdom vitest",
     "typescript": "tsc -b tsconfig.json"

packages/react/src/accordion/header/AccordionHeader.tsx

@@ -1,6 +1,6 @@
 'use client';
 import * as React from 'react';
-import { BaseUIComponentProps } from '../../utils/types';
+import type { BaseUIComponentProps } from '../../utils/types';
 import { useRenderElement } from '../../utils/useRenderElement';
 import type { AccordionItem } from '../item/AccordionItem';
 import { useAccordionItemContext } from '../item/AccordionItemContext';

packages/react/src/use-render/useRender.ts

@@ -1,6 +1,5 @@
 import * as React from 'react';
-import type { ComponentRenderFn } from '../utils/types';
-import { HTMLProps } from '../utils/types';
+import type { ComponentRenderFn, HTMLProps } from '../utils/types';
 import { useRenderElement } from '../utils/useRenderElement';
 
 /**

packages/react/src/utils/useRenderElement.tsx

@@ -3,7 +3,7 @@ import { useMergedRefs, useMergedRefsN } from '@base-ui-components/utils/useMerg
 import { isReactVersionAtLeast } from '@base-ui-components/utils/reactVersion';
 import { mergeObjects } from '@base-ui-components/utils/mergeObjects';
 import type { BaseUIComponentProps, ComponentRenderFn, HTMLProps } from './types';
-import { CustomStyleHookMapping, getStyleHookProps } from './getStyleHookProps';
+import { type CustomStyleHookMapping, getStyleHookProps } from './getStyleHookProps';
 import { resolveClassName } from './resolveClassName';
 import { mergeProps, mergePropsN, mergeClassNames } from '../merge-props';
 import { EMPTY_OBJECT } from './constants';

packages/react/tsconfig.build.json

@@ -10,7 +10,8 @@
     "moduleResolution": "bundler",
     "noEmit": false,
     "rootDir": "./src",
-    "outDir": "build/esm"
+    "jsx": "react-jsx",
+    "outDir": "build"
   },
   "include": ["src/**/*.ts*"],
   "exclude": ["src/**/*.spec.ts*", "src/**/*.test.ts*"],

packages/utils/package.json

@@ -15,10 +15,9 @@
   "type": "commonjs",
   "scripts": {
     "prebuild": "rimraf --glob build build-tests \"*.tsbuildinfo\"",
-    "build": "code-infra build && pnpm build:copy-files",
-    "build:stable": "code-infra build --bundle esm --buildTypes false",
+    "build": "tsdown && code-infra copy-files",
     "build:copy-files": "code-infra copy-files .npmignore",
-    "test:package": "publint --pack pnpm run ./build && attw --pack ./build --exclude-entrypoints package.json --exclude-entrypoints esm --exclude-entrypoints cjs",
+    "test:package": "publint --pack pnpm run build && attw --pack ./build --exclude-entrypoints package.json",
     "release": "pnpm build && pnpm publish",
     "test": "cross-env NODE_ENV=test VITEST_ENV=jsdom vitest",
     "typescript": "tsc -b tsconfig.json"

packages/utils/tsconfig.build.json

@@ -10,7 +10,8 @@
     "moduleResolution": "bundler",
     "noEmit": false,
     "rootDir": "./src",
-    "outDir": "build/esm"
+    "jsx": "react-jsx",
+    "outDir": "build"
   },
   "include": ["src/**/*.ts*", "src/**/*.tsx"],
   "exclude": ["src/**/*.spec.ts*", "src/**/*.test.ts*"]