nodeTypesRegistry.getSubTypesOf doesnt work for abstract node types

[mhsdesign]

This is not a real issue but rather document the state as is.

With the bugfix neos/neos-development-collection#4561 (in Neos 8.3.7 and later) the node type schema size was reduced and optimized.

This leads to a necessary regression in the experimental plugin api of the neos ui: The javascript nodeTypesRegistry does not know about abstract node types! That means that for example fetching all subtypes of a mixin: getSubTypesOf wont work, as the schema doesnt contain the mixin.

This is generally not recommended to have such heavy logic computed on the frontend, instead the backend and frontendConfiguration should be preferred.

But to quickly fix this, you can use the internal api of the nodeTypeRoles like this:

Neos:
  Neos:
    Ui:
      nodeTypeRoles:
        'Vendor:MyRole': 'Vendor:Mixins.Role'

this leads to the node type still being included in the schema generation and thus makes getSubTypesOf function as previously.