[wp-trac] [WordPress Trac] #63676: Blocks without rendered content (including blocks via block visibility) still enqueue scripts and styles

[WordPress Trac]

#63676: Blocks without rendered content (including blocks via block visibility)
still enqueue scripts and styles
-------------------------------------+-------------------------------------
 Reporter:  westonruter              |       Owner:  westonruter
     Type:  defect (bug)             |      Status:  closed
 Priority:  normal                   |   Milestone:  6.9
Component:  Editor                   |     Version:  5.9
 Severity:  normal                   |  Resolution:  fixed
 Keywords:  has-patch needs-testing  |     Focuses:  javascript, css,
  dev-feedback has-unit-tests        |  performance
-------------------------------------+-------------------------------------
Changes (by westonruter):

 * status:  accepted => closed
 * resolution:   => fixed


Comment:

 In [changeset:"60930" 60930]:
 {{{
 #!CommitTicketReference repository="" revision="60930"
 Editor: Avoid enqueueing assets for blocks which do not render content.

 This change prevents scripts, styles, and script modules from being
 enqueued for blocks that do not render any HTML content. This is common
 for hidden blocks or blocks like the Featured Image block when no image is
 present. This change reduces the amount of unused CSS and JavaScript on a
 page, improving performance.

 A new filter, `enqueue_empty_block_content_assets`, is introduced to allow
 developers to override this behavior and enqueue assets for empty blocks
 if needed.

 The implementation involves capturing the asset queues before and after a
 block is rendered. The newly enqueued assets are only merged if the
 block's rendered content is not empty. This is done recursively for nested
 blocks to ensure that assets for inner blocks are also not enqueued if a
 parent block is hidden.

 Developed in https://github.com/WordPress/wordpress-develop/pull/9213.

 Props westonruter, aristath, peterwilsoncc, gziolo, krupajnanda, dd32,
 jorbin.
 See #50328.
 Fixes #63676.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/63676#comment:26>
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