Add `Non_Blocking_Scripts_Check` #519

swissspidy · 2024-07-11T14:59:12Z

This runtime check is pretty basic right now but does the following:

Test various URLs, similar to our other styles/scripts checks
Enqueues all scripts
Checks whether each enqueued script match the plugin (based on URL)
For matching scripts, checks whether they're enqueued in the footer or the header and if they have a loading strategy

Warnings are reported if either is the case:

a) The script is enqueued in the header, without async/defer -> suggest adding async/defer
b) The script is enqueued in the footer -> suggest adding async/defer

Fixes #467

github-actions · 2024-07-11T15:01:28Z

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Co-authored-by: swissspidy <[email protected]>
Co-authored-by: adamsilverstein <[email protected]>
Co-authored-by: ernilambar <[email protected]>
Co-authored-by: westonruter <[email protected]>
Co-authored-by: mukeshpanchal27 <[email protected]>

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includes/Checker/Checks/Non_Blocking_Scripts_Check.php

adamsilverstein

Looks good! only some small feedback and a question.

includes/Checker/Checks/Non_Blocking_Scripts_Check.php

westonruter · 2024-07-11T16:27:13Z

includes/Checker/Checks/Non_Blocking_Scripts_Check.php

+				array(
+					'posts_per_page' => 1,
+					'post_type'      => $post_type,
+					'post_status'    => array( 'publish', 'inherit' ),


Why inherit?

Not sure, to be honest, I copied this from the other checks.

In PR #76, we added a first run time check. The b6e5e56 added the "inherit" post status. I don't think this check is necessary, and there has been no feedback or discussion on the PR regarding it. It appears to have been added by mistake, so we should remove it in a follow-up PR.

includes/Checker/Checks/Non_Blocking_Scripts_Check.php

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

swissspidy · 2024-07-12T09:28:01Z

Worth noting that this has some overlap with the WordPress.WP.EnqueuedResourceParameters.NotInFooter PHPCS sniff which we also run. But as per WordPress/WordPress-Coding-Standards#2420 it is limited and might even get removed.

includes/Checker/Checks/Performance/Non_Blocking_Scripts_Check.php

mukeshpanchal27 · 2024-07-15T05:01:15Z

includes/Checker/Checks/Non_Blocking_Scripts_Check.php

+				array(
+					'posts_per_page' => 1,
+					'post_type'      => $post_type,
+					'post_status'    => array( 'publish', 'inherit' ),


In PR #76, we added a first run time check. The b6e5e56 added the "inherit" post status. I don't think this check is necessary, and there has been no feedback or discussion on the PR regarding it. It appears to have been added by mistake, so we should remove it in a follow-up PR.

includes/Checker/Checks/Performance/Non_Blocking_Scripts_Check.php

mukeshpanchal27

Thanks for the PR! Overall looks good to me. Left some feedbacks.

Co-authored-by: Mukesh Panchal <[email protected]>

mukeshpanchal27

Approved. Left one non-blocking feedback.

tests/phpunit/tests/Checker/Checks/Non_Blocking_Scripts_Check_Tests.php

…Tests.php Co-authored-by: Mukesh Panchal <[email protected]>

westonruter · 2024-07-16T23:18:15Z

includes/Checker/Checks/Performance/Non_Blocking_Scripts_Check.php

+		foreach ( wp_scripts()->done as $handle ) {
+			$script = wp_scripts()->registered[ $handle ];
+
+			// TODO: Somehow detect inline scripts added by the plugin that don't have a `src`.


Is this referring to before/after inline scripts? Or to scripts that are manually printed with wp_print_inline_script_tag() or otherwise?

Both I suppose :-)

Right now the detection whether a script is coming from a plugin is very basic. Something like Origination + loopback requests would be more robust.

adamsilverstein · 2024-07-22T17:06:07Z

includes/Checker/Checks/Performance/Non_Blocking_Scripts_Check.php

+			);
+
+			if ( ! isset( $posts[0] ) ) {
+				throw new Exception(


maybe just skip silently here, sicne a post type could have no posts?

This runtime check creates exactly 1 post in every post type, so it is guaranteed to have one.

adamsilverstein · 2024-07-22T17:07:17Z

includes/Checker/Checks/Performance/Non_Blocking_Scripts_Check.php

+	protected function get_urls() {
+		$urls = array( home_url() );
+
+		foreach ( $this->get_viewable_post_types() as $post_type ) {


maybe add a sanity limit here, check at most 5 or 10 post types, I can imagine some site has 10,000 post types and this breaks site health for them

Hmm no other plugins are active during checks and we're checking only a specific plugin here, I doubt that a single plugin adds that many post types.

If we add a limit, then we'd need to add it to all the runtime checks, but I don't see a need for it.

adamsilverstein

overall looks good, left some small feedback

westonruter

A suggestion, but LGTM

westonruter · 2024-07-22T19:51:11Z

includes/Checker/Checks/Performance/Non_Blocking_Scripts_Check.php

+		wp_scripts()->do_footer_items();
+		ob_end_clean();
+
+		foreach ( wp_scripts()->done as $handle ) {


I just realized what may be a more robust way to handle this, which will also include support for inline scripts: use HTML Tag Processor to iterate over generated markup instead of iterating over the done handles. There could be one output buffer for the head and another for the footer. This would then handle cases where a plugin is adding the strategy attribute manually via the script_loader_tag filter. It would also flag cases where a script fails to get a strategy due to a blocking dependent script depending on an async/defer script.

But that can be done in a subsequent PR.

A new issue for this sounds like a good idea 👍

includes/Checker/Checks/Performance/Non_Blocking_Scripts_Check.php

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

Add Non_Blocking_Scripts_Check

4c68736

swissspidy added [Type] Enhancement A suggestion for improvement of an existing feature Checks Audit/test of the particular part of the plugin [Team] Performance Issues owned by Performance Team labels Jul 11, 2024

Lint fix

30cedfe

Remove dead code

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swissspidy requested review from westonruter, joemcgill, ernilambar, adamsilverstein and mukeshpanchal27 July 11, 2024 15:06

adamsilverstein reviewed Jul 11, 2024

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swissspidy and others added 5 commits July 12, 2024 11:09

Add missing entry

c665f51

Fix indentation

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

Use ob_end_clean()

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

Adjust docblock

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Adjust error message

7a74daf

Merge branch 'trunk' into fix/467-strategy

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swissspidy requested a review from felixarntz as a code owner July 13, 2024 12:26

Fix import

31fdb1d

mukeshpanchal27 reviewed Jul 15, 2024

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Apply suggestions from code review

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Co-authored-by: Mukesh Panchal <[email protected]>

mukeshpanchal27 approved these changes Jul 16, 2024

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…Tests.php Co-authored-by: Mukesh Panchal <[email protected]>

swissspidy added this to the 1.1.0 milestone Jul 16, 2024

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Merge branch 'trunk' into fix/467-strategy

cdf5d58

swissspidy requested review from adamsilverstein, ernilambar and westonruter July 19, 2024 08:49

adamsilverstein reviewed Jul 22, 2024

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westonruter approved these changes Jul 22, 2024

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Apply suggestion to add script handle

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

swissspidy merged commit 436bcec into trunk Jul 23, 2024
21 checks passed

swissspidy deleted the fix/467-strategy branch July 23, 2024 16:47

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Add `Non_Blocking_Scripts_Check` #519

Add `Non_Blocking_Scripts_Check` #519

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Add Non_Blocking_Scripts_Check #519

Add Non_Blocking_Scripts_Check #519

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Add `Non_Blocking_Scripts_Check` #519

Add `Non_Blocking_Scripts_Check` #519

swissspidy commented Jul 11, 2024 •

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