I'm trying to write a plugin that lets modpack authors (me) define custom markdown manuals with KubeJS. I'm looking to be able to do something like this:

events.listen("manual.registry", (event: ManualRegistryEvent) => {
    event.create("test")
        .tab("grass", Item.of("minecraft:grass"))
        .documentProvider((path: string, lang: string) => { /* ... */ });
});

Tragically, it seems like firing my registry event from init() is too early, and afterInit() is too late since registries are already frozen. It would be nice if KubeJSPlugin offered a method that gets called during the init phase but after the scripts have been loaded.

If you're doing this on Forge, you should just be able to use the @SubscribeEvent annotation inside the plugin class and register the plugin to the mod bus during init(), since startup scripts should have definitely already been loaded by that point. We might introduce another way down the line, but right now it doesn't seem like it's needed ^^

This is now a thing on 1.18! See RegistryObjectBuilderTypes for more information (keep in mind that this only works for things using Minecraft(-like) registries, since we're using Architectury DeferredRegisters under the hood ^^