Examine full patch of build changes.

.github/workflows/reusable-phpunit-tests-v3.yml

@@ -165,6 +165,9 @@ jobs:
       - name: Install npm dependencies
         run: npm ci
 
+      - name: Build WordPress
+        run: npm run build:dev
+
       - name: General debug information
         run: |
           npm --version

.github/workflows/reusable-test-core-build-process.yml

@@ -39,6 +39,7 @@ on:
 
 env:
   PUPPETEER_SKIP_DOWNLOAD: ${{ true }}
+  NODE_OPTIONS: --max-old-space-size=4096
 
 # Disable permissions for all available scopes by default.
 # Any needed permissions should be configured at the job level.

.github/workflows/reusable-test-local-docker-environment-v1.yml

@@ -120,6 +120,9 @@ jobs:
       - name: Install npm dependencies
         run: npm ci
 
+      - name: Build WordPress
+        run: npm run build:dev
+
       - name: General debug information
         run: |
           npm --version

.github/workflows/test-build-processes.yml

@@ -32,7 +32,6 @@ on:
       # Confirm any changes to relevant workflow files.
       - '.github/workflows/test-build-processes.yml'
       - '.github/workflows/reusable-test-core-build-process.yml'
-      - '.github/workflows/reusable-test-gutenberg-build-process.yml'
   workflow_dispatch:
 
 # Cancels all previous workflow runs for pull requests that have not completed.
@@ -98,54 +97,13 @@ jobs:
       os: ${{ matrix.os }}
       directory: ${{ matrix.directory }}
 
-  # Tests the Gutenberg plugin build process within a wordpress-develop checkout.
-  test-gutenberg-build-process:
-    name: Gutenberg running from ${{ matrix.directory }}
-    uses: ./.github/workflows/reusable-test-gutenberg-build-process.yml
-    permissions:
-      contents: read
-    if: ${{ github.repository == 'WordPress/wordpress-develop' }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [ 'ubuntu-24.04' ]
-        directory: [ 'src', 'build' ]
-    with:
-      os: ${{ matrix.os }}
-      directory: ${{ matrix.directory }}
-
-  # Tests the Gutenberg plugin build process on additional operating systems.
-  #
-  # This is separate from the job above in order to use stricter conditions when determining when to test additional
-  # operating systems. This avoids unintentionally consuming excessive minutes. Windows-based jobs consume minutes at a
-  # 2x rate, and MacOS-based jobs at a 10x rate.
-  # See https://docs.github.com/en/billing/concepts/product-billing/github-actions#per-minute-rates.
-  #
-  # The `matrix` and `runner` contexts are not available for use within `if` expressions. So there is
-  # currently no way to determine the OS being used on a given job.
-  # See https://docs.github.com/en/actions/learn-github-actions/contexts#context-availability.
-  test-gutenberg-build-process-additional-os:
-    name: Gutenberg running from ${{ matrix.directory }}
-    uses: ./.github/workflows/reusable-test-gutenberg-build-process.yml
-    permissions:
-      contents: read
-    if: ${{ github.repository == 'WordPress/wordpress-develop' }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [ 'macos-15', 'windows-2025' ]
-        directory: [ 'src', 'build' ]
-    with:
-      os: ${{ matrix.os }}
-      directory: ${{ matrix.directory }}
-
   slack-notifications:
     name: Slack Notifications
     uses: ./.github/workflows/slack-notifications.yml
     permissions:
       actions: read
       contents: read
-    needs: [ test-core-build-process, test-core-build-process-additional-os, test-gutenberg-build-process, test-gutenberg-build-process-additional-os ]
+    needs: [ test-core-build-process, test-core-build-process-additional-os ]
     if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event_name != 'pull_request' && always() }}
     with:
       calling_status: ${{ contains( needs.*.result, 'cancelled' ) && 'cancelled' || contains( needs.*.result, 'failure' ) && 'failure' || 'success' }}

.gitignore

@@ -20,6 +20,7 @@ wp-tests-config.php
 /node_modules
 /npm-debug.log
 /build
+/gutenberg
 /tests/phpunit/build
 /wp-cli.local.yml
 /jsdoc
@@ -30,16 +31,16 @@ wp-tests-config.php
 /src/wp-admin/css/colors/*/*.css
 /src/wp-admin/js
 /src/wp-includes/assets/*
-!/src/wp-includes/assets/script-loader-packages.min.php
-!/src/wp-includes/assets/script-modules-packages.min.php
 /src/wp-includes/js
 /src/wp-includes/css/dist
 /src/wp-includes/css/*.min.css
 /src/wp-includes/css/*-rtl.css
-/src/wp-includes/blocks/**/*.css
-/src/wp-includes/blocks/**/*.js
-/src/wp-includes/blocks/**/*.js.map
+/src/wp-includes/blocks/*
+!/src/wp-includes/blocks/index.php
+/src/wp-includes/build
+/src/wp-includes/theme.json
 /packagehash.txt
+/.gutenberg-hash
 /artifacts
 /setup.log
 /coverage

Gruntfile.js

@@ -3,7 +3,6 @@
 /* globals Set */
 var webpackConfig = require( './webpack.config' );
 var installChanged = require( 'install-changed' );
-var json2php = require( 'json2php' );
 
 module.exports = function(grunt) {
 	var path = require('path'),
@@ -1279,6 +1278,14 @@ module.exports = function(grunt) {
 							BUILD_DIR + 'wp-includes/js/dist/commands.js',
 						],
 						dest: BUILD_DIR + 'wp-includes/js/dist/'
+					},
+					{
+						expand: true,
+						flatten: true,
+						src: [
+							BUILD_DIR + 'wp-includes/js/dist/vendor/**/*.js'
+						],
+						dest: BUILD_DIR + 'wp-includes/js/dist/vendor/'
 					}
 				]
 			}
@@ -1414,6 +1421,64 @@ module.exports = function(grunt) {
 		grunt.task.run( 'wp-packages:refresh-deps' );
 	} );
 
+	// Gutenberg integration tasks.
+	grunt.registerTask( 'gutenberg-checkout', 'Checks out the Gutenberg repository.', function() {
+		const done = this.async();
+		grunt.util.spawn( {
+			cmd: 'node',
+			args: [ 'tools/gutenberg/checkout-gutenberg.js' ],
+			opts: { stdio: 'inherit' }
+		}, function( error ) {
+			done( ! error );
+		} );
+	} );
+
+	grunt.registerTask( 'gutenberg-build', 'Builds the Gutenberg repository.', function() {
+		const done = this.async();
+		grunt.util.spawn( {
+			cmd: 'node',
+			args: [ 'tools/gutenberg/build-gutenberg.js' ],
+			opts: { stdio: 'inherit' }
+		}, function( error ) {
+			done( ! error );
+		} );
+	} );
+
+	grunt.registerTask( 'gutenberg-copy', 'Copies Gutenberg build output to WordPress Core.', function() {
+		const done = this.async();
+		const buildDir = grunt.option( 'dev' ) ? 'src' : 'build';
+		grunt.util.spawn( {
+			cmd: 'node',
+			args: [ 'tools/gutenberg/copy-gutenberg-build.js', `--build-dir=${ buildDir }` ],
+			opts: { stdio: 'inherit' }
+		}, function( error ) {
+			done( ! error );
+		} );
+	} );
+
+	grunt.registerTask( 'gutenberg-sync', 'Syncs Gutenberg checkout and build if ref has changed.', function() {
+		const done = this.async();
+		grunt.util.spawn( {
+			cmd: 'node',
+			args: [ 'tools/gutenberg/sync-gutenberg.js' ],
+			opts: { stdio: 'inherit' }
+		}, function( error ) {
+			done( ! error );
+		} );
+	} );
+
+	grunt.registerTask( 'copy-vendor-scripts', 'Copies vendor scripts from node_modules to wp-includes/js/dist/vendor/.', function() {
+		const done = this.async();
+		const buildDir = grunt.option( 'dev' ) ? 'src' : 'build';
+		grunt.util.spawn( {
+			cmd: 'node',
+			args: [ 'tools/vendors/copy-vendors.js', `--build-dir=${ buildDir }` ],
+			opts: { stdio: 'inherit' }
+		}, function( error ) {
+			done( ! error );
+		} );
+	} );
+
 	grunt.renameTask( 'watch', '_watch' );
 
 	grunt.registerTask( 'watch', function() {
@@ -1569,23 +1634,6 @@ module.exports = function(grunt) {
 		}
 	} );
 
-	grunt.registerTask( 'copy:block-json', 'Copies block.json file contents to block-json.php.', function() {
-		var blocks = {};
-		grunt.file.recurse( SOURCE_DIR + 'wp-includes/blocks', function( abspath, rootdir, subdir, filename ) {
-			if ( /^block\.json$/.test( filename ) ) {
-				blocks[ subdir ] = grunt.file.readJSON( abspath );
-			}
-		} );
-		grunt.file.write(
-			SOURCE_DIR + 'wp-includes/blocks/blocks-json.php',
-			'<?php return ' + json2php.make( {
-				linebreak: '\n',
-				indent: '  ',
-				shortArraySyntax: false
-			} )( blocks ) + ';'
-		);
-	} );
-
 	grunt.registerTask( 'copy:js', [
 		'copy:npm-packages',
 		'copy:vendor-js',
@@ -1723,7 +1771,6 @@ module.exports = function(grunt) {
 	grunt.registerTask( 'build:files', [
 		'clean:files',
 		'copy:files',
-		'copy:block-json',
 		'copy:version',
 	] );
 
@@ -1853,6 +1900,9 @@ module.exports = function(grunt) {
 			grunt.task.run( [
 				'build:js',
 				'build:css',
+				'gutenberg-sync',
+				'gutenberg-copy',
+				'copy-vendor-scripts',
 				'build:certificates'
 			] );
 		} else {
@@ -1861,6 +1911,9 @@ module.exports = function(grunt) {
 				'build:files',
 				'build:js',
 				'build:css',
+				'gutenberg-sync',
+				'gutenberg-copy',
+				'copy-vendor-scripts',
 				'replace:source-maps',
 				'verify:build'
 			] );