[lua] Add lua.Lib.getModuleVarargs() for module-level varargs capture

src/generators/genlua.ml

@@ -2016,6 +2016,7 @@ let generate com =
 
     if has_feature ctx "Class" || has_feature ctx "Type.getClassName" then add_feature ctx "lua.Boot.isClass";
     if has_feature ctx "Enum" || has_feature ctx "Type.getEnumName" then add_feature ctx "lua.Boot.isEnum";
+    if has_feature ctx "lua.Lib.getModuleVarargs" then add_feature ctx "use._hx_module_varargs";
 
     let print_file path =
         let file_content = Std.input_file ~bin:true path in
@@ -2168,6 +2169,7 @@ let generate com =
         "use._hx_table", "lua/_lua/_hx_table.lua";
         "use._hx_wrap_if_string_field", "lua/_lua/_hx_wrap_if_string_field.lua";
         "use._hx_dyn_add", "lua/_lua/_hx_dyn_add.lua";
+        "use._hx_module_varargs", "lua/_lua/_hx_module_varargs.lua";
     ];
 
     print_file (find_file "lua/_lua/_hx_handle_error.lua");

std/lua/Lib.hx

@@ -70,6 +70,15 @@ class Lib {
 		return ret;
 	}
 
+	/**
+		Returns the module-level varargs (`...`) passed to the Lua chunk.
+		Useful in environments like ComputerCraft where script arguments
+		are only available via module-level varargs, not `_G.arg`.
+	**/
+	public static function getModuleVarargs():Table<Int, String> {
+		return untyped _hx_module_varargs;
+	}
+
 	/**
 		Simple test for the presence of an available shell.
 	**/

std/lua/_lua/_hx_module_varargs.lua

@@ -0,0 +1 @@
+_hx_module_varargs = {...}