Upgrade to JQuery 4

[nickchomey]

JQuery just released a beta version of jQuery v4. Is this something that wp core will be looking to implement?

​https://blog.jquery.com/2024/02/06/jquery-4-0-0-beta/

[mgol]

#60511 was marked as a duplicate.

[swissspidy]

@azaozz Maybe something for the ​https://wordpress.org/plugins/wp-jquery-update-test/ plugin?

[azaozz]

Is this something that wp core will be looking to implement?

Of course :)

Replying to swissspidy:

Maybe something for the ​https://wordpress.org/plugins/wp-jquery-update-test/ plugin?

Yep, thinking the test plugin can be updated for WP 6.5 (currently in beta). Then try to time the update to jQuery 4.0 depending on when it is released.

[firoz2456]

The ​https://wordpress.org/plugins/wp-jquery-update-test/ plugin is not compatible with newer versions of WordPress; it is only compatible with WordPress 5.6 and earlier versions.
Does anyone have suggestions on how to test it with jQuery 4.0.0 BETA?

Trac ticket:

All tests pass here despite having removed utf8_encode, which is unexpected. is it possible this encoding is no longer required?

[adamsilverstein]

Adding the performance tag, noting that the new jQuery version touts some performance benefits, including a "slim" version with a smaller size. ​https://blog.jquery.com/2024/02/06/jquery-4-0-0-beta/

[adamsilverstein]

Note the linked PR above is not related to this ticket, I'm not sure how it got linked and can't seem to remove the linkage.

[adamsilverstein]

@azaozz Maybe something for the ​https://wordpress.org/plugins/wp-jquery-update-test/ plugin?

I opened ​this issue to track adding support in the wp-jquery-update-test plugin.

[azaozz]

Replying to adamsilverstein:

Thanks. Yea, lets update the plugin for WP 6.5+. Seems it will only need to replace the bundled version of jQuery.

Somewhat unsure if jQuery 4.0 beta supports Migrate 3.4.1 and UI 1.13.2, or these will have to be updated too (when updates are available). Still good to update the test plugin imho.

[azaozz]

@adamsilverstein Updated the test plugin: ​https://github.com/WordPress/wp-jquery-update-test, could you have a look too if you get a chance :)

Also did some quick testing with jQuery 4.0.0-beta in wp-admin and everything seems to be working well. If all seems okay with the test plugin the next step would be to publish on make/core and invite (a lot) more testing.

[azaozz]

Been seeing this bug in jQuery Migrate ​https://github.com/jquery/jquery-migrate/issues/495 quite a bit recently jQuery.expr.match.bool is undefined. It is patched upstream but there's no new Migrate release yet. As WP depends on running jQuery Migrate, thinking to release the test plugin with a new version of Migrate so the people that will test jQuery 4 in WP don't run into it.

[mgol]

@azaozz thanks for the reminder. I’m on vacation now but I’ll remember to release a new Migrate on early July when I’m back.

[azaozz]

Replying to mgol:

Great, thank you!

[mgol]

@azaozz jQuery Migrate 3.5.0 has been released: ​https://github.com/jquery/jquery-migrate/releases/tag/3.5.0

[azaozz]

Replying to mgol:

Thanks for the ping! Will update the WP test plugin asap.

[azaozz]

Updated the ​test plugin.

@adamsilverstein Could you have a quick look if I haven't missed anything. Thinking to release it as soon as WP 6.6 is out.

[adamsilverstein]

Updated the test plugin.

Excellent, thank you @azaozz! I'll take a look.

[adamsilverstein]

All of the readme and base class updates look good, I'm happy to try some testing, but I think its fine to release and get wider testing at this point so we can see how smooth upgrading goes for people.

[azaozz]

Replying to adamsilverstein:

Great! Thanks for having a look. Will release it in couple of days, as soon as WP 6.6 is out.

[azaozz]

Testing plugin released: ​https://wordpress.org/plugins/wp-jquery-update-test/. Please install it and test!

[swissspidy]

The second beta of jQuery 4.0.0 has been released: ​https://blog.jquery.com/2024/07/17/second-beta-of-jquery-4-0-0/

Note the changed handling of boolean attributes, that’s the most risky change in this release compared to the previous beta.

[azaozz]

The second beta of jQuery 4.0.0 has been released:

Yep, updated the testing plugin to include it and the latest jQuery Migrate. Also posted to make/core: ​https://make.wordpress.org/core/2024/08/23/updating-jquery-shipped-with-wordpress-to-version-4-0/