[wp-trac] [WordPress Trac] #63898: Add support for lazy-loaded derived state props

[WordPress Trac]

#63898: Add support for lazy-loaded derived state props
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 Reporter:  darerodz           |      Owner:  (none)
     Type:  defect (bug)       |     Status:  new
 Priority:  normal             |  Milestone:  Awaiting Review
Component:  Interactivity API  |    Version:  trunk
 Severity:  normal             |   Keywords:
  Focuses:                     |
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 There is a problem with [https://developer.wordpress.org/block-editor
 /reference-guides/interactivity-api/api-reference/#derived-state derived
 state props] when the store containing them is not loaded before
 hydration, which can happen with stores loaded asynchronously, e.g.,
 {{{@wordpress/interactivity-router}}}, and also they have a PHP equivalent
 used for server-side rendering.

 In that case, when those missing derived state props are evaluated, they
 will return {{{undefined}}}, and the directives subscribed to that value
 will replace the value generated on the server with the PHP function with
 {{{undefined}}}, effectively removing the HTML generated on the server.

 The Interactivity API should be aware of which values were generated on
 the server via a PHP Closure (derived state props) and avoid replacing the
 directive's value on the client until a getter is available that can
 correctly recalculate it.

 This requires serializing which state props are closures that were used
 during directive processing to generate the HTML markup.

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Ticket URL: <https://core.trac.wordpress.org/ticket/63898>
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