Dependency extraction webpack plugin: use package.json wpScript value to determine bundling

.github/workflows/check-package-changelogs.yml

@@ -49,14 +49,13 @@ jobs:
                     - interface
                     - style-runtime
                     - ui
-                    - undo-manager
                     - views
+                    - widget-dashboard
+                    - widget-primitives
                     # Other packages
                     - theme
                     - components
                     - private-apis
-                    - widget-dashboard
-                    - widget-primitives
                     - wp-build
         steps:
             - name: 'Get PR commit count'

packages/admin-ui/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Internal
+
+-   Declare `wpScript: false` to mark the package as bundled rather than externalized. ([#79945](https://github.com/WordPress/gutenberg/pull/79945))
+
 ## 2.5.0 (2026-07-01)
 
 ## 2.4.0 (2026-06-24)

packages/admin-ui/package.json

@@ -39,6 +39,7 @@
 		},
 		"./package.json": "./package.json"
 	},
+	"wpScript": false,
 	"types": "build-types",
 	"sideEffects": [
 		"src/**/*.module.css"

packages/dataviews/CHANGELOG.md

@@ -8,6 +8,7 @@
 
 ### Internal
 
+-   Declare `wpScript: false` to mark the package as bundled rather than externalized. ([#79945](https://github.com/WordPress/gutenberg/pull/79945))
 -   Update `@ariakit/react` to `0.4.32` ([#79860](https://github.com/WordPress/gutenberg/pull/79860)).
 
 ## 17.1.0 (2026-07-01)

packages/dataviews/package.json

@@ -48,6 +48,7 @@
 		},
 		"./build-style/": "./build-style/"
 	},
+	"wpScript": false,
 	"types": "build-types",
 	"sideEffects": false,
 	"dependencies": {

packages/dependency-extraction-webpack-plugin/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Enhancements
+
+-   Determine bundled packages from `wpScript: false` in `package.json` instead of a hardcoded list. ([#79945](https://github.com/WordPress/gutenberg/pull/79945))
+
 ### Bug Fixes
 
 -   Extract dynamically imported external modules that webpack code-splits into their own async chunk in the module build ([#79633](https://github.com/WordPress/gutenberg/pull/79633)).

packages/dependency-extraction-webpack-plugin/lib/util.js

@@ -1,17 +1,137 @@
 const WORDPRESS_NAMESPACE = '@wordpress/';
-const BUNDLED_PACKAGES = [
-	'@wordpress/admin-ui',
-	'@wordpress/dataviews',
-	'@wordpress/dataviews/wp',
-	'@wordpress/fields',
-	'@wordpress/grid',
-	'@wordpress/icons',
-	'@wordpress/interface',
-	'@wordpress/style-runtime',
-	'@wordpress/ui',
-	'@wordpress/undo-manager',
-	'@wordpress/views',
-];
+const { readFileSync, existsSync } = require( 'fs' );
+const path = require( 'path' );
+const { createRequire } = require( 'module' );
+
+const packageJsonCache = new Map();
+const packagePathCache = new Map();
+
+/**
+ * Find the nearest package root directory by walking up from the given directory.
+ * Looks for a directory containing package.json.
+ *
+ * @param {string} startDir The directory to start searching from.
+ * @return {string} The package root directory, or the start directory if no package.json found.
+ */
+function findPackageRoot( startDir ) {
+	let current = startDir;
+	const root = path.parse( current ).root;
+
+	while ( current !== root ) {
+		const packageJsonPath = path.join( current, 'package.json' );
+		if ( existsSync( packageJsonPath ) ) {
+			return current;
+		}
+		current = path.dirname( current );
+	}
+
+	// Fallback to the start directory if no package.json found.
+	return startDir;
+}
+
+/**
+ * Reads package.json info using Node's module resolution.
+ *
+ * @param {string}      fullPackageName The full package name (e.g. '@wordpress/blocks').
+ * @param {string|null} resolveDir      Optional directory context for resolution.
+ * @return {{wpScript?: boolean, wpScriptModuleExports?: string|Object}|null} Package metadata when resolvable.
+ */
+function getPackageInfo( fullPackageName, resolveDir = null ) {
+	const packageRoot = resolveDir
+		? findPackageRoot( resolveDir )
+		: process.cwd();
+	const cacheKey = `${ fullPackageName }@${ packageRoot }`;
+
+	if ( packageJsonCache.has( cacheKey ) ) {
+		return packageJsonCache.get( cacheKey );
+	}
+
+	const contextPath = path.join( packageRoot, 'package.json' );
+	const contextRequire = createRequire( contextPath );
+
+	let resolved;
+	try {
+		resolved = contextRequire.resolve(
+			`${ fullPackageName }/package.json`
+		);
+	} catch ( error ) {
+		const code = error.code;
+		if (
+			code === 'MODULE_NOT_FOUND' ||
+			code === 'ERR_PACKAGE_PATH_NOT_EXPORTED'
+		) {
+			packageJsonCache.set( cacheKey, null );
+			return null;
+		}
+		throw error;
+	}
+
+	const result = getPackageInfoFromFile( resolved );
+	packageJsonCache.set( cacheKey, result );
+
+	return result;
+}
+
+/**
+ * Reads package.json info from an explicit file path.
+ *
+ * @param {string} packageJsonPath Absolute path to package.json file.
+ * @return {{wpScript?: boolean, wpScriptModuleExports?: string|Object}|null} Package metadata when resolvable.
+ */
+function getPackageInfoFromFile( packageJsonPath ) {
+	if ( packagePathCache.has( packageJsonPath ) ) {
+		return packagePathCache.get( packageJsonPath );
+	}
+	const packageJson = JSON.parse( readFileSync( packageJsonPath, 'utf8' ) );
+	packagePathCache.set( packageJsonPath, packageJson );
+	return packageJson;
+}
+
+/**
+ * Read package metadata for an import request.
+ *
+ * @param {string} request Module request (the module name in `import from`).
+ * @return {{wpScript?: boolean, wpScriptModuleExports?: string|Object}|undefined} Package metadata when resolvable.
+ */
+function getPackageMetadata( request ) {
+	const packageName = getPackageNameFromRequest( request );
+
+	if ( ! packageName ) {
+		return;
+	}
+
+	return getPackageInfo( packageName );
+}
+
+/**
+ * Determine whether a package should stay bundled in script builds.
+ * Packages are bundled only when they explicitly opt out of script registration
+ * via `wpScript: false`.
+ *
+ * @param {string} request Module request (the module name in `import from`).
+ * @return {boolean} True when package should remain bundled in scripts.
+ */
+function isBundledPackageForScripts( request ) {
+	const packageMetadata = getPackageMetadata( request );
+	if ( ! packageMetadata ) {
+		return false;
+	}
+
+	return packageMetadata.wpScript !== true;
+}
+
+/**
+ * Extract package name (`@scope/name`) from an import request.
+ *
+ * @param {string} request Module request (the module name in `import from`).
+ * @return {string|undefined} Package name when request is namespaced.
+ */
+function getPackageNameFromRequest( request ) {
+	const parts = request.split( '/' );
+	if ( parts[ 0 ]?.startsWith( '@' ) && parts.length >= 2 ) {
+		return `${ parts[ 0 ] }/${ parts[ 1 ] }`;
+	}
+}
 
 /**
  * Default request to global transformation
@@ -55,7 +175,7 @@ function defaultRequestToExternal( request ) {
 		return 'ReactRefreshRuntime';
 	}
 
-	if ( BUNDLED_PACKAGES.includes( request ) ) {
+	if ( isBundledPackageForScripts( request ) ) {
 		return undefined;
 	}
 

packages/dependency-extraction-webpack-plugin/test/util.js

@@ -48,6 +48,16 @@ describe( 'defaultRequestToExternal', () => {
 		).toEqual( [ 'wp', 'someFuturePackage' ] );
 	} );
 
+	test( 'Keeps bundled @wordpress packages internal', () => {
+		expect( defaultRequestToExternal( '@wordpress/ui' ) ).toBeUndefined();
+	} );
+
+	test( 'Externalizes wpScript packages', () => {
+		expect( defaultRequestToExternal( '@wordpress/undo-manager' ) ).toEqual(
+			[ 'wp', 'undoManager' ]
+		);
+	} );
+
 	test( 'Handles react request', () => {
 		expect( defaultRequestToExternal( 'react' ) ).toBe( 'React' );
 	} );

packages/fields/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Internal
+
+-   Declare `wpScript: false` to mark the package as bundled rather than externalized. ([#79945](https://github.com/WordPress/gutenberg/pull/79945))
+
 ## 0.42.0 (2026-07-01)
 
 ## 0.41.0 (2026-06-24)

packages/fields/package.json

@@ -40,6 +40,7 @@
 		},
 		"./package.json": "./package.json"
 	},
+	"wpScript": false,
 	"types": "build-types",
 	"sideEffects": [
 		"build-style/**",

packages/icons/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Internal
+
+-   Declare `wpScript: false` to mark the package as bundled rather than externalized. ([#79945](https://github.com/WordPress/gutenberg/pull/79945))
+
 ## 15.1.0 (2026-07-01)
 
 ## 15.0.0 (2026-06-24)

packages/icons/package.json

@@ -40,6 +40,7 @@
 		},
 		"./package.json": "./package.json"
 	},
+	"wpScript": false,
 	"types": "build-types",
 	"sideEffects": false,
 	"dependencies": {

packages/interface/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Internal
+
+-   Declare `wpScript: false` to mark the package as bundled rather than externalized. ([#79945](https://github.com/WordPress/gutenberg/pull/79945))
+
 ## 9.35.0 (2026-07-01)
 
 ## 9.34.0 (2026-06-24)

packages/interface/package.json

@@ -41,6 +41,7 @@
 		"./package.json": "./package.json",
 		"./build-style/": "./build-style/"
 	},
+	"wpScript": false,
 	"sideEffects": [
 		"build-style/**",
 		"src/**/*.scss",

packages/style-runtime/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Internal
+
+-   Declare `wpScript: false` to mark the package as bundled rather than externalized. ([#79945](https://github.com/WordPress/gutenberg/pull/79945))
+
 ## 0.6.0 (2026-07-01)
 
 ## 0.5.0 (2026-06-24)

packages/style-runtime/package.json

@@ -39,6 +39,7 @@
 		},
 		"./package.json": "./package.json"
 	},
+	"wpScript": false,
 	"types": "build-types",
 	"sideEffects": false,
 	"publishConfig": {

packages/views/CHANGELOG.md

@@ -2,4 +2,8 @@
 
 ## Unreleased
 
+### Internal
+
+-   Declare `wpScript: false` to mark the package as bundled rather than externalized. ([#79945](https://github.com/WordPress/gutenberg/pull/79945))
+
 ## 1.17.0 (2026-07-01)

packages/views/package.json

@@ -39,6 +39,7 @@
 		},
 		"./package.json": "./package.json"
 	},
+	"wpScript": false,
 	"types": "build-types",
 	"dependencies": {
 		"@wordpress/core-data": "file:../core-data",