[wp-trac] [WordPress Trac] #63253: Theme REST API: expose "has_theme_json" field

[WordPress Trac]

#63253: Theme REST API: expose "has_theme_json" field
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 Reporter:  wildworks     |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  REST API      |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Currently, there is no official way to detect whether the active theme has
 `theme.json` or not via REST API.

 We needed to check for the existence of theme.json to conditionally expose
 Stylebook for the classic theme. As a temporary approach, we used the
 `supportsLayout` setting, which is the equivalent of the
 `wp_theme_has_theme_json()` function:

 https://github.com/WordPress/gutenberg/blob/a4a5b07b4432d28ad4eb3646435bbaf9a8f9796e/packages
 /edit-site/src/components/site-editor-routes/utils.js#L11-L12

 However, there is no guarantee that this setting will remain equivalent to
 `wp_theme_has_theme_json()` in the future.

 We should expose the new "has_theme_json" field via the theme REST API.

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Ticket URL: <https://core.trac.wordpress.org/ticket/63253>
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