missing stuff from quickcarpet

src/main/java/carpet/mixins/EndCityFeatureMixin.java

@@ -0,0 +1,34 @@
+package carpet.mixins;
+
+import carpet.CarpetSettings;
+import com.google.common.collect.Lists;
+import com.mojang.datafixers.Dynamic;
+import net.minecraft.entity.EntityType;
+import net.minecraft.world.biome.Biome;
+import net.minecraft.world.gen.feature.DefaultFeatureConfig;
+import net.minecraft.world.gen.feature.EndCityFeature;
+import net.minecraft.world.gen.feature.StructureFeature;
+import org.spongepowered.asm.mixin.Mixin;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.function.Function;
+
+@Mixin(EndCityFeature.class)
+public abstract class EndCityFeatureMixin extends StructureFeature<DefaultFeatureConfig>
+{
+    private static final List<Biome.SpawnEntry> spawnList = Lists.newArrayList(new Biome.SpawnEntry(EntityType.SHULKER, 10, 4, 4));
+
+    public EndCityFeatureMixin(Function<Dynamic<?>, ? extends DefaultFeatureConfig> function_1)
+    {
+        super(function_1);
+    }
+
+    @Override
+    public List<Biome.SpawnEntry> getMonsterSpawns()
+    {
+        if (CarpetSettings.b_shulkerSpawningInEndCities)
+            return spawnList;
+        return Collections.emptyList();
+    }
+}