[wp-trac] [WordPress Trac] #53175: Block Editor: Include the theme.json infrastructure code and support

[WordPress Trac]

#53175: Block Editor: Include the theme.json infrastructure code and support
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 Reporter:  youknowriad               |       Owner:  (none)
     Type:  task (blessed)            |      Status:  closed
 Priority:  normal                    |   Milestone:  5.8
Component:  Editor                    |     Version:
 Severity:  normal                    |  Resolution:  fixed
 Keywords:  has-patch has-unit-tests  |     Focuses:
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Comment (by noisysocks):

 Hey @youknowriad, [50992] breaks style concatenation. You can see this by
 navigating to `/wp-admin/load-styles.php?load=wp-components`. This should
 show the CSS for `@wordpress/components` but instead results in an empty
 page with status 500.

 The reason is because the file which defines `WP_Theme_JSON_Resolver`
 won't be imported by `load-styles.php` (and `load-scripts.php`) which
 bypasses the usual WordPress initialisation steps (`wp-settings.php`).

 You'll need to wrap the call to `WP_Theme_JSON_Resolver` with a
 `class_exists` or import `class-wp-theme-json-resolver.php` in `load-
 styles.php` and `load-scripts.php`.

 This is what is causing the failures in
 https://github.com/WordPress/gutenberg/pull/32176/checks?check_run_id=2663937068.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53175#comment:27>
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