.

bukkit/src/main/java/de/kentoj/kencommandapi/type/WorldArgumentType.java

@@ -0,0 +1,32 @@
+package de.kentoj.kencommandapi.type;
+
+import de.kentoj.kencommandapi.api.argument.ArgumentType;
+import de.kentoj.kencommandapi.api.suggestion.SuggestionProvider;
+import org.bukkit.Bukkit;
+import org.bukkit.World;
+
+import java.util.UUID;
+import java.util.stream.Stream;
+
+public class WorldArgumentType<T> implements ArgumentType<T, World> {
+    @Override
+    public World parseInputUnchecked(String input) throws IllegalArgumentException {
+        var world = Bukkit.getWorld(input);
+        if (world == null && input.length() == 36) {
+            try {
+                return Bukkit.getWorld(UUID.fromString(input));
+            } catch (IllegalArgumentException _) {
+                throw new IllegalArgumentException("World not found");
+            }
+        }
+        return world;
+    }
+
+    @Override
+    public SuggestionProvider<T> getDefaultSuggestionProvider() {
+        return _ -> Stream.concat(
+                Bukkit.getWorlds().stream().map(World::getName),
+                Bukkit.getWorlds().stream().map(w -> w.getUID().toString())
+        ).toList();
+    }
+}