Package:              com.codex.composer.api.v1.event
Canonical Name: com.codex.composer.api.v1.event.ServerRecipeManagerEvents

These events are used by the DeferredRecipeRegistry to register recipe property sets post 1.21.3. These property sets are used by, among many other things probably, handled screens when shift-clicking items into input slots, and if there isn't one registered for the proper recipe type, then you will not be able to quick-move the items. This event exists, because recipe property sets are not actually registered anywhere, and are rather just stored in a constant static field in ServerRecipeManager, thus this event to modify it.

I don't recommend using this event by itself as using a DeferredRecipeRegistry to create and register the property set is much easier, but if you really want to, here is documentation:

/* Method called on the creation of the static map. Modify the values map in place.
   All other callbacks use the same Map instance, so try not to clear it please :) */
void append(Map<RegistryKey<RecipePropertySet>, ServerRecipeManager.SoleIngredientGetter> values);

As used in DeferredRecipeRegistry:

public RegistryKey<RecipePropertySet> registerPropertySet(String name, ServerRecipeManager.SoleIngredientGetter ingredientGetter) {
    RegistryKey<RecipePropertySet> key = RegistryKey.of(...);
    ServerRecipeManagerEvents.PROPERTY_SET_REGISTRATION.register(map -> map.put(key, ingredientGetter));
    return key;
}