Plan to allow editing props and slots for exposed code components

wim leers → credited tedbow → .

Crediting @tedbow for #3500043-3: Publishing code components → .

Related: ✨ Usage info for code components with unpublished changes Postponed . Because … it'd be 100% safe to change props and slots whenever as long as there are no instances yet. And thanks to 📌 Calculate field and component dependencies on save and store them in an easy to retrieve format Active , that's now actually possible.

IOW: the conversation here needs to be forked along two paths:

1. 0 instances exist: anything is allowed
2. >=1 instances exist: care is needed

Note: a new required prop would actually be trivial to support. Because XB requires required props to have an example value!

Especially since 🐛 Component trees with dynamic prop sources that introspect field values don't add the relevant fields to their dependencies Active just added ::getDefaultExplicitInput(), this would be easy to support.

Conceptually speaking, the needed changes would be:

1. ComponentTreeHydrated would have to change from
   

   $source->renderComponent($stored_explicit_input)
   

   to

   $source->renderComponent($stored_explicit_input + $source->getDefaultExplicitInput())
   </li>
   <li>EITHER <code>ValidComponentTreeConstraintValidator

   would need to be updated to relax from

   $component_source->validateComponentInput(
             inputValues: $stored_explicit_input,
             component_instance_uuid: $component_instance_uuid,
             entity: $host_entity,
           ),
   

   to also do + $source->getDefaultExplicitInput()

   OR

   \Drupal\experience_builder\Controller\ClientServerConversionTrait::convertClientToServer() should do + $source->getDefaultExplicitInput(), which would ensure that any edit to any component tree would automatically add new required props' default values.

Important for usability of Code Component creators.

Critical for XB's data integrity when we add support for changing props/slots.

Initial plan posted! 🏓