canUser select does not work with the global styles post type.

[jorgefilipecosta]

Description

When using the canUser selector against global styles the selector always returns false even for admin users with the capability.

Step-by-step reproduction instructions

• Load the site editor with an admin user, and verify you can change global styles.
• Paste the following code in the browser console: await wp.data.resolveSelect('core').canUser('read', {kind: 'postType', name: 'wp_global_styles' });, verify it returns false when it should be true.
• Paste the follow code in browser console: await wp.data.resolveSelect('core').canUser( 'read', 'global_styles' );, verify it returns false when it should be true.

Screenshots, screen recording, code snippet

No response

Environment info

• Gutenberg trunk with the latest WordPress trunk, also in WordPress trunk without the plugin.

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes

[Mamaduka]

@jorgefilipecosta, it turns out we made a couple of wrong assumptions.

• The global styles entity is registered with kind: 'root', name: 'globalStyles', not as a post type.
• It doesn't have a route for list items, with means the following selectors won't work - select( 'core' ).canUser( 'read', { kind: 'root', name: 'globalStyles' } ) and select( 'core' ).getEntityRecords( 'root', 'globalStyles' ).

You can only check capabilities for individual global styles entities - canUser( 'read', { kind: 'root', name: 'globalStyles', id: 41 } );.

The id value can be obtained using select( 'core' ).__experimentalGetCurrentGlobalStylesId(), though I'm unsure if it works for low capability users.

[jorgefilipecosta]

Thank you for researching this @Mamaduka. I think we can close this issue. I used your findings to propose a simplification at https://github.com/WordPress/gutenberg/pull/63812.