Add stylesheet minification for bundled themes (Block themes) #10081

b1ink0 · 2025-09-29T18:31:07Z

TODO:

Stylesheet minification for Twenty Twenty-Two and Twenty Twenty-Five (Block themes).
~~Stylesheet minification for Twenty Nineteen, Twenty Twenty, and Twenty Twenty-One themes (Classic themes with existing build setup).~~
~~Stylesheet minification for classic themes without existing build setup.~~
~~Use Webpack instead of Gruntfile for a more streamlined workflow.~~
Update related GitHub workflow for handling stylesheet minification.
~~Add server-side or client-side minification of stylesheets.~~

Trac ticket: https://core.trac.wordpress.org/ticket/63012

This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

Co-authored-by: Shyamsundar Gadde <[email protected]>

…wenty-One themes Co-authored-by: Shyamsundar Gadde <[email protected]>

…y Twenty, and Twenty Twenty-One theme stylesheet header comment Co-authored-by: Shyamsundar Gadde <[email protected]>

github-actions · 2025-09-29T18:59:13Z

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b1ink0 · 2025-09-29T20:03:59Z

cc: @westonruter

westonruter · 2025-09-30T01:15:29Z

@b1ink0 To make this easier to review and initially land, how about this initial PR be limited to just the block themes. To that end, could you revert the changes to all themes other than Twenty Twenty-Two and Twenty Twenty-Five? Once this is merged, we can then follow up with restoring the changes you currently have. Once we establish the pattern with the block themes, then it will be easier to then follow up with classic themes.

The highest priority is for the block themes well, since these are the ones which will be eligible to have their theme styles inlined, since they are very small. The classic themes will likely not be eligible for inlining, so the impact of minification will be less.

westonruter · 2025-09-30T01:19:52Z

src/wp-content/themes/twentytwentyfive/functions.php

+		$src = 'style.min.css';
+		if ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG || strpos( wp_get_wp_version(), '-src' ) || ! file_exists( get_parent_theme_file_path( 'style.min.css' ) ) ) {


In default-constants.php, the SCRIPT_DEBUG constant is always defined. So we don't need to check for it. This can also use str_contains() instead, since the polyfill was introduced in WP 5.9.

Suggested change

$src = 'style.min.css';

if ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG || strpos( wp_get_wp_version(), '-src' ) || ! file_exists( get_parent_theme_file_path( 'style.min.css' ) ) ) {

if ( SCRIPT_DEBUG || str_contains( wp_get_wp_version(), '-src' ) || ! file_exists( get_parent_theme_file_path( 'style.min.css' ) ) ) {

Note that when SCRIPT_DEBUG is defined, it will check the version to see if it contains -src as well.

When considering what core is doing for the emoji loader:

file_get_contents( ABSPATH . WPINC . '/js/wp-emoji-loader' . wp_scripts_get_suffix() . '.js' )

I think we can skip the file_exists() check as well.

If this were using get_stylesheet_uri() then we'd need the file_exists() check since it could be that the child theme has a style.css but not a style.min.css. But since we're only looking at the parent theme, then that isn't needed.

See #10081 (comment) for a suggestion to tie this together.

Note that when SCRIPT_DEBUG is defined, it will check the version to see if it contains -src as well.

Okay, default-constants.php is handling this, so the check can be removed without an issue.

If this were using get_stylesheet_uri() then we'd need the file_exists() check since it could be that the child theme has a style.css but not a style.min.css. But since we're only looking at the parent theme, then that isn't needed.

I have a doubt about this case. Currently, since we are not shipping minified files in the repo, the contributor needs to navigate to the theme and run npm run build to generate the minified files.

Let's say a core contributor is using the TT5 or TT2 theme and sets SCRIPT_DEBUG to false while debugging some other core scripts TT5 will then try to load the minified file, which doesn’t exist.

There are two solutions I can think of:

Keep the file existence check.

Create a new Webpack config that generates the minified files when npm run dev is run at the root level. (This is required because the Gruntfile only generates the minified files in the build folder.)

I believe this is to be expected. For example, if you force SCRIPT_DEBUG to be false in core without having done a build, you get all kinds of errors related to missing scripts and styles.

My bad, after setting SCRIPT_DEBUG to false and running npm run dev, it does generate the minified files for the theme in the src directory 😅.

src/wp-content/themes/twentytwentyfive/functions.php

src/wp-content/themes/twentytwentytwo/functions.php

westonruter · 2025-09-30T02:21:32Z

Results are looking good so far!

Twenty Twenty-Five

The stylesheet's size is reduced from 3.1 kB down to 0.8 kB, or ~75% smaller.

Before:

After:

Twenty Twenty-Two

The stylesheet's size is reduced from 6.6 kB down to 2.7 kB, or ~60% smaller.

…n, Twenty Twenty, and Twenty Twenty-One theme stylesheet header comment" This reverts commit 96cc018.

…Twenty Twenty-One themes" This reverts commit d3beb63.

Co-authored-by: Weston Ruter <[email protected]>

westonruter · 2025-10-03T04:38:23Z

Can this be marked as ready for review as opposed to being a draft? It would be good to get more contributors who work on bundled themes to also look. It's looking good to me!

Update related GitHub workflow for handling stylesheet minification.

What is this about?

b1ink0 · 2025-10-03T04:48:23Z

Update related GitHub workflow for handling stylesheet minification.

What is this about?

Need to work on the deployment workflow of themes with a build step. There is already logic for handling T19, T20, and TT1, but need to add support for TT2 and TT5. ~~Will do it today~~.

github-actions · 2025-10-03T17:26:25Z

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…into feature/add-stylesheet-minification-for-bundled-themes

…es.yml workflow

westonruter · 2025-10-06T21:31:47Z

Need to work on the deployment workflow of themes with a build step. There is already logic for handling T19, T20, and TT1, but need to add support for TT2 and TT5.

@b1ink0 I've added these in f908cca and b83b6d0

westonruter

When I turn off SCRIPT_DEBUG with Twenty Twenty-Five:

-<link rel='stylesheet' id='twentytwentyfive-style-css' href='http://localhost:8000/wp-content/themes/twentytwentyfive/style.css?ver=1.3' media='all' />
+<link rel='stylesheet' id='twentytwentyfive-style-css' href='http://localhost:8000/wp-content/themes/twentytwentyfive/style.min.css?ver=1.3' media='all' />

And in Twenty Twenty-Two:

-<link rel='stylesheet' id='twentytwentytwo-style-css' href='http://localhost:8000/wp-content/themes/twentytwentytwo/style.css?ver=2.0' media='all' />
+<link rel='stylesheet' id='twentytwentytwo-style-css' href='http://localhost:8000/wp-content/themes/twentytwentytwo/style.min.css?ver=2.0' media='all' />

Gruntfile.js

aaronjorbin · 2025-10-07T10:43:03Z

.gitignore

+/src/wp-content/themes/twentytwentytwo/node_modules
+/src/wp-content/themes/twentytwentyfive/node_modules
+
+# Minified files in bundled themes


I think this will have the effect of never shipping the minified files since the files won't be in the checked out code.

Yes, since the minified files are ignored, the ZIP files are being prepared from the repository without the minified files. See below:

wordpress-develop/.github/workflows/test-and-zip-default-themes.yml

Lines 216 to 230 in 73e822f

steps:

- name: Checkout repository

uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0

with:

ref: ${{ github.event_name == 'workflow_dispatch' && inputs.branch || github.ref }}

show-progress: ${{ runner.debug == '1' && 'true' || 'false' }}

persist-credentials: false

- name: Upload theme ZIP as an artifact

uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2

with:

name: ${{ matrix.theme }}

path: src/wp-content/themes/${{ matrix.theme }}

if-no-files-found: error

include-hidden-files: true

There are two options I can think of to resolve this:

We can include the minified files in the repo, similar to how classic themes require contributors to include the built CSS and CSS map files generated from SCSS files.

We could add a build step for TT2 and TT5 in the workflow for the bundle-theme job before the Upload theme ZIP as an artifact step is run.
This would work if the release of the bundled theme is handled through a GitHub workflow.
ref: https://make.wordpress.org/core/handbook/about/release-cycle/update-bundled-themes-2/#creating-theme-zip-files

cc: @westonruter

It sounds like the second option would be preferred, as I really don't like minified files being committed to the repo. For the classic themes using SASS it's a bit different because the changes to the .scss files at least result in changes to .css files which can get a clean diff. But for minified files, and changes just results in a lot of noise.

I will admit I don't have any experience with the theme release workflows, so I don't know specifically what is required to implement that second option.

I drafted the new bundle-theme job steps with assistance from Gemini Code Assist: 39bac29

It looks like the new job step is working correctly!

https://github.com/WordPress/wordpress-develop/actions/runs/18329688092?pr=10081

In the above action run, the generated artifacts now contain the minified files.

TT5: https://github.com/WordPress/wordpress-develop/actions/runs/18329688092/artifacts/4209767198
TT2: https://github.com/WordPress/wordpress-develop/actions/runs/18329688092/artifacts/4209767505

Props to @sabernhardt for pointing out that the node_modules was getting included in the build artifacts! This should now be removed as of 99a0969.

The Core handbook page for updating bundled themes will need an update.

I think the KISS approach would be to document that only zips created via the GitHub workflow should be used when updating the theme directory using a notice block so it's appropriately highlighted.

src/wp-content/themes/twentytwentytwo/style.css

…y-Five themes Co-authored-by: Jon Surrell <[email protected]>

Co-authored-by: Aaron Jorbin <[email protected]>

…ytwentyfive Co-authored-by: Aditya Dhade <[email protected]> Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

src/wp-content/themes/twentytwentyfive/package.json

…dled-themes

Co-authored-by: Stephen A. Bernhardt <[email protected]> Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

peterwilsoncc

I've added a few notes inline.

src/wp-content/themes/twentytwentyfive/package.json

.github/workflows/test-and-zip-default-themes.yml

peterwilsoncc · 2025-10-12T23:44:11Z

.gitignore

+/src/wp-content/themes/twentytwentytwo/node_modules
+/src/wp-content/themes/twentytwentyfive/node_modules
+
+# Minified files in bundled themes


The Core handbook page for updating bundled themes will need an update.

I think the KISS approach would be to document that only zips created via the GitHub workflow should be used when updating the theme directory using a notice block so it's appropriately highlighted.

…and package.json in themes Co-authored-by: Peter Wilson <[email protected]>

…into feature/add-stylesheet-minification-for-bundled-themes

westonruter · 2025-10-13T21:38:56Z

This PR is a blocker for two other other tickets milestoned for 6.9: Core-63007 and Core-63018. So if there aren't any other key concerns, I want to commit this enhancement to get moving on those other tickets. Approvals appreciated.

tests/phpunit/tests/theme.php

Co-authored-by: Peter Wilson <[email protected]>

peterwilsoncc

This looks good for commit.

I've marked a bunch of discussions as resolved, the one that remains open is to document zip generation in the core handbook for updating bundled themes in the theme repo.

This introduces a build process to provide minified stylesheets for the Twenty Twenty-Two and Twenty Twenty-Five themes. The built minified CSS is not committed to version control. When `SCRIPT_DEBUG` is disabled, the minified `style.min.css` file will be enqueued to improve performance, including reducing render-blocking resources as well as facilitating inlining. See #63007. * Stylesheets are minified via the new core `cssmin:themes` Grunt task, which is automatically run as part of `build:css`. * The same build process is added to the themes (via `package.json` and `package-lock.json`) with `build` and `watch` commands; the `postcss` and `cssnano` development dependencies are used to handle CSS minification. * The `functions.php` in each theme is updated to enqueue `style.min.css` unless `SCRIPT_DEBUG` is enabled, in which case `style.css` is enqueued. * A notice comment is added to `style.css` to warn against editing the stylesheet since the minified version will likely be served instead. * A new `contributing.txt` file is added to each theme to document the build process for developers. * The `test-and-zip-default-themes` GitHub workflow is updated to install npm dependencies and build the minified assets before packaging the themes. * New PHPUnit tests are added to verify version number consistency across `style.css`, `readme.txt`, `package.json`, and `package-lock.json` files in default themes. Developed in #10081. Props b1ink0, westonruter, shyamgadde, jonsurrell, sabernhardt, jorbin, peterwilsoncc, poena. Fixes #63012. git-svn-id: https://develop.svn.wordpress.org/trunk@60934 602fd350-edb4-49c9-b593-d223f7449a82

github-actions · 2025-10-15T05:39:16Z

A commit was made that fixes the Trac ticket referenced in the description of this pull request.

SVN changeset: 60934
GitHub commit: b56b386

This PR will be closed, but please confirm the accuracy of this and reopen if there is more work to be done.

This introduces a build process to provide minified stylesheets for the Twenty Twenty-Two and Twenty Twenty-Five themes. The built minified CSS is not committed to version control. When `SCRIPT_DEBUG` is disabled, the minified `style.min.css` file will be enqueued to improve performance, including reducing render-blocking resources as well as facilitating inlining. See #63007. * Stylesheets are minified via the new core `cssmin:themes` Grunt task, which is automatically run as part of `build:css`. * The same build process is added to the themes (via `package.json` and `package-lock.json`) with `build` and `watch` commands; the `postcss` and `cssnano` development dependencies are used to handle CSS minification. * The `functions.php` in each theme is updated to enqueue `style.min.css` unless `SCRIPT_DEBUG` is enabled, in which case `style.css` is enqueued. * A notice comment is added to `style.css` to warn against editing the stylesheet since the minified version will likely be served instead. * A new `contributing.txt` file is added to each theme to document the build process for developers. * The `test-and-zip-default-themes` GitHub workflow is updated to install npm dependencies and build the minified assets before packaging the themes. * New PHPUnit tests are added to verify version number consistency across `style.css`, `readme.txt`, `package.json`, and `package-lock.json` files in default themes. Developed in WordPress/wordpress-develop#10081. Props b1ink0, westonruter, shyamgadde, jonsurrell, sabernhardt, jorbin, peterwilsoncc, poena. Fixes #63012. Built from https://develop.svn.wordpress.org/trunk@60934 git-svn-id: http://core.svn.wordpress.org/trunk@60270 1a063a9b-81f0-0310-95a4-ce76da25c4cd

This introduces a build process to provide minified stylesheets for the Twenty Twenty-Two and Twenty Twenty-Five themes. The built minified CSS is not committed to version control. When `SCRIPT_DEBUG` is disabled, the minified `style.min.css` file will be enqueued to improve performance, including reducing render-blocking resources as well as facilitating inlining. See #63007. * Stylesheets are minified via the new core `cssmin:themes` Grunt task, which is automatically run as part of `build:css`. * The same build process is added to the themes (via `package.json` and `package-lock.json`) with `build` and `watch` commands; the `postcss` and `cssnano` development dependencies are used to handle CSS minification. * The `functions.php` in each theme is updated to enqueue `style.min.css` unless `SCRIPT_DEBUG` is enabled, in which case `style.css` is enqueued. * A notice comment is added to `style.css` to warn against editing the stylesheet since the minified version will likely be served instead. * A new `contributing.txt` file is added to each theme to document the build process for developers. * The `test-and-zip-default-themes` GitHub workflow is updated to install npm dependencies and build the minified assets before packaging the themes. * New PHPUnit tests are added to verify version number consistency across `style.css`, `readme.txt`, `package.json`, and `package-lock.json` files in default themes. Developed in WordPress/wordpress-develop#10081. Props b1ink0, westonruter, shyamgadde, jonsurrell, sabernhardt, jorbin, peterwilsoncc, poena. Fixes #63012. Built from https://develop.svn.wordpress.org/trunk@60934 git-svn-id: https://core.svn.wordpress.org/trunk@60270 1a063a9b-81f0-0310-95a4-ce76da25c4cd

westonruter · 2025-10-15T06:00:46Z

Follow-up (#10279) which adds these notices to the Theme File Editor:

b1ink0 and others added 3 commits September 29, 2025 17:15

Add CSS minification for Twenty Twenty-Two and Twenty Twenty-Five themes

4d543ef

Co-authored-by: Shyamsundar Gadde <[email protected]>

Add CSS minification for Twenty Nineteen, Twenty Twenty, and Twenty T…

d3beb63

…wenty-One themes Co-authored-by: Shyamsundar Gadde <[email protected]>

Add re-minification instructions notice to the Twenty Nineteen, Twent…

96cc018

…y Twenty, and Twenty Twenty-One theme stylesheet header comment Co-authored-by: Shyamsundar Gadde <[email protected]>

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b1ink0 and others added 3 commits September 30, 2025 17:14

Revert "Add re-minification instructions notice to the Twenty Ninetee…

d2a352b

…n, Twenty Twenty, and Twenty Twenty-One theme stylesheet header comment" This reverts commit 96cc018.

Revert "Add CSS minification for Twenty Nineteen, Twenty Twenty, and …

0e2085e

…Twenty Twenty-One themes" This reverts commit d3beb63.

Improve documentation

d479361

Co-authored-by: Weston Ruter <[email protected]>

b1ink0 changed the title ~~Add stylesheet minification for bundled themes~~ Add stylesheet minification for bundled themes (Block themes) Sep 30, 2025

Simplify stylesheet filename logic using SCRIPT_DEBUG suffix

0f0df2f

Co-authored-by: Weston Ruter <[email protected]>

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b1ink0 requested a review from westonruter October 1, 2025 16:55

b1ink0 marked this pull request as ready for review October 3, 2025 17:26

westonruter added 4 commits October 6, 2025 14:07

Merge branch 'trunk' of https://github.com/WordPress/wordpress-develop …

2a1d893

…into feature/add-stylesheet-minification-for-bundled-themes

Add twentytwentytwo and twentytwentyfive to test-and-zip-default-them…

f908cca

…es.yml workflow

Add dependabot configs for the themes

b83b6d0

Improve notice in style.css regarding minification process

3a9539d

Fix typo

b43e826

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Add TT2 and TT5 themes to workflow triggers

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Simplify notice in style.css for Twenty Twenty-Two and Twenty Twent…

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…y-Five themes Co-authored-by: Jon Surrell <[email protected]>

Add contributing.txt files for npm usage

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Co-authored-by: Aaron Jorbin <[email protected]>

Add steps to bundle-theme to minify CSS for twentytwentytwo and twent…

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…ytwentyfive Co-authored-by: Aditya Dhade <[email protected]> Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

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Avoid including node_modules in theme release ZIP

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Co-authored-by: Stephen A. Bernhardt <[email protected]> Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

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Add test case for version consistency between style.css, readme.txt, …

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…and package.json in themes Co-authored-by: Peter Wilson <[email protected]>

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Add Theme File Editor notice when editing a stylesheet for a block theme and warn when there is a minified version available #10279

Closed

		$src = 'style.min.css';
		if ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG \|\| strpos( wp_get_wp_version(), '-src' ) \|\| ! file_exists( get_parent_theme_file_path( 'style.min.css' ) ) ) {

	$src = 'style.min.css';
	if ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG \|\| strpos( wp_get_wp_version(), '-src' ) \|\| ! file_exists( get_parent_theme_file_path( 'style.min.css' ) ) ) {
	if ( SCRIPT_DEBUG \|\| str_contains( wp_get_wp_version(), '-src' ) \|\| ! file_exists( get_parent_theme_file_path( 'style.min.css' ) ) ) {

	steps:
	- name: Checkout repository
	uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
	with:
	ref: ${{ github.event_name == 'workflow_dispatch' && inputs.branch \|\| github.ref }}
	show-progress: ${{ runner.debug == '1' && 'true' \|\| 'false' }}
	persist-credentials: false

	- name: Upload theme ZIP as an artifact
	uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
	with:
	name: ${{ matrix.theme }}
	path: src/wp-content/themes/${{ matrix.theme }}
	if-no-files-found: error
	include-hidden-files: true

Add stylesheet minification for bundled themes (Block themes) #10081

Add stylesheet minification for bundled themes (Block themes) #10081

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github-actions bot commented Sep 29, 2025

Test using WordPress Playground

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b1ink0 Sep 30, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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westonruter commented Sep 30, 2025

Twenty Twenty-Five

Twenty Twenty-Two

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b1ink0 Oct 7, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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b1ink0 commented Sep 29, 2025 •

edited by westonruter

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b1ink0 Sep 30, 2025 •

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b1ink0 commented Oct 3, 2025 •

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github-actions bot commented Oct 3, 2025 •

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