Datagen

PklDataProvider runs PKL through vanilla datagen for mods that prefer baking resources into the jar at build time. It walks data/**/*.pkl in your input resources, evaluates each file, and writes the JSON to the datagen output mirroring the path (.pkl to .json).

@SubscribeEvent
fun onGatherData(event: GatherDataEvent) {
    event.generator.addProvider(
        event.includeServer(),
        PklDataProvider(event.generator.packOutput, event.inputs)
    )
}

Author src/main/resources/data/mymod/recipes/steel.pkl:

import "pklmc:recipe.pkl" as recipe

local r: recipe.ShapedRecipe = new {
  // ...
}

output { renderer = new JsonRenderer {}; value = r }

Run ./gradlew runData and steel.json lands in generated/ like any other datagen output.

Datagen vs virtual datapack

Failures during datagen are logged per file and don’t abort the run. Check the log for PKL datagen failed.