From b5ac8ea37bc69a25f4c6f8b08fd2c619985b6cbb Mon Sep 17 00:00:00 2001
From: Jonathan Desrosiers <359867+desrosj@users.noreply.github.com>
Date: Thu, 19 Mar 2026 08:40:00 -0400
Subject: [PATCH 1/5] Add `grunt clean` to `postinstall` temporarily.

---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index faf0b41fffee6..b08c3e4b8039f 100644
--- a/package.json
+++ b/package.json
@@ -112,7 +112,7 @@
 		"wicg-inert": "3.1.3"
 	},
 	"scripts": {
-		"postinstall": "npm run gutenberg:verify",
+		"postinstall": "npm run grunt clean -- --dev && npm run gutenberg:verify",
 		"build": "grunt build",
 		"build:dev": "grunt build --dev",
 		"build:gutenberg": "grunt build:gutenberg",

From cf1ac405142619730619e3ce5843af0d7d8c4a70 Mon Sep 17 00:00:00 2001
From: Jonathan Desrosiers <359867+desrosj@users.noreply.github.com>
Date: Thu, 19 Mar 2026 09:15:37 -0400
Subject: [PATCH 2/5] Try `gutenberg:download` instead.

The previous attempt was creating an infinite loop.
---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index b08c3e4b8039f..bc52d838d4176 100644
--- a/package.json
+++ b/package.json
@@ -112,7 +112,7 @@
 		"wicg-inert": "3.1.3"
 	},
 	"scripts": {
-		"postinstall": "npm run grunt clean -- --dev && npm run gutenberg:verify",
+		"postinstall": "npm run gutenberg:download",
 		"build": "grunt build",
 		"build:dev": "grunt build --dev",
 		"build:gutenberg": "grunt build:gutenberg",

From 04c37f21ccf7c971c1a750370df85ebdb38356a4 Mon Sep 17 00:00:00 2001
From: Jonathan Desrosiers <359867+desrosj@users.noreply.github.com>
Date: Thu, 19 Mar 2026 10:42:02 -0400
Subject: [PATCH 3/5] Try moving clean after verify.

---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index bc52d838d4176..a32904d79895d 100644
--- a/package.json
+++ b/package.json
@@ -112,7 +112,7 @@
 		"wicg-inert": "3.1.3"
 	},
 	"scripts": {
-		"postinstall": "npm run gutenberg:download",
+		"postinstall": "npm run gutenberg:verify && npm run grunt clean -- --dev",
 		"build": "grunt build",
 		"build:dev": "grunt build --dev",
 		"build:gutenberg": "grunt build:gutenberg",

From 73e0060922624eb8013f66c2c142b56ce5703981 Mon Sep 17 00:00:00 2001
From: Jonathan Desrosiers <359867+desrosj@users.noreply.github.com>
Date: Thu, 19 Mar 2026 10:51:49 -0400
Subject: [PATCH 4/5] Add code in Grunt itself.

---
 Gruntfile.js | 12 ++++++++++--
 package.json |  2 +-
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/Gruntfile.js b/Gruntfile.js
index dddc595d2e29d..0ebfe5d99dfb7 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -2063,9 +2063,17 @@ module.exports = function(grunt) {
 	] );
 
 	grunt.registerTask( 'build', function() {
+		grunt.util.spawn( {
+			grunt: true,
+			args: [ 'clean', '--dev' ],
+			opts: { stdio: 'inherit' }
+		}, function( buildError ) {
+			done( ! buildError );
+		} );
+
 		if ( grunt.option( 'dev' ) ) {
 			grunt.task.run( [
-				'gutenberg:verify',
+				'gutenberg:download',
 				'build:js',
 				'build:css',
 				'build:codemirror',
@@ -2075,7 +2083,7 @@ module.exports = function(grunt) {
 			] );
 		} else {
 			grunt.task.run( [
-				'gutenberg:verify',
+				'gutenberg:download',
 				'build:certificates',
 				'build:files',
 				'build:js',
diff --git a/package.json b/package.json
index a32904d79895d..faf0b41fffee6 100644
--- a/package.json
+++ b/package.json
@@ -112,7 +112,7 @@
 		"wicg-inert": "3.1.3"
 	},
 	"scripts": {
-		"postinstall": "npm run gutenberg:verify && npm run grunt clean -- --dev",
+		"postinstall": "npm run gutenberg:verify",
 		"build": "grunt build",
 		"build:dev": "grunt build --dev",
 		"build:gutenberg": "grunt build:gutenberg",

From c88e55f3a009a4092033d728ae8e8a9caacda714 Mon Sep 17 00:00:00 2001
From: Jonathan Desrosiers <359867+desrosj@users.noreply.github.com>
Date: Thu, 19 Mar 2026 10:54:45 -0400
Subject: [PATCH 5/5] Add missing `done`.

---
 Gruntfile.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Gruntfile.js b/Gruntfile.js
index 0ebfe5d99dfb7..821046a4c86c6 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -2063,6 +2063,8 @@ module.exports = function(grunt) {
 	] );
 
 	grunt.registerTask( 'build', function() {
+		var done = this.async();
+		
 		grunt.util.spawn( {
 			grunt: true,
 			args: [ 'clean', '--dev' ],