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To get started with this, create a class that extends FabricAdvancementProvider and register it in your datagen entrypoint like so:

private static class MyAdvancementGenerators extends FabricAdvancementProvider {
 
     protected MyAdvancementGenerators(FabricDataGenerator dataGenerator) {
         super(dataGenerator);
     }
 
     @Override
     public void generateAdvancement(Consumer<Advancement> consumer) {
         // ...
     }
}
 
// ...
 
@Override
public void onInitializeDataGenerator(FabricDataGenerator fabricDataGenerator) {
    // ...
    fabricDataGenerator.addProvider(MyAdvancementGenerators::new);
    // ...
}

Advancements