Fix mypy issues

blueprintcompiler/language/__init__.py

@@ -1,7 +1,8 @@
 """ Contains all the syntax beyond basic objects, properties, signal, and
 templates. """
 
-from .gobject_object import Object
+from .attributes import BaseAttribute, BaseTypedAttribute
+from .gobject_object import Object, ObjectContent
 from .gobject_property import Property
 from .gobject_signal import Signal
 from .gtk_a11y import A11y
@@ -14,6 +15,7 @@ from .gtk_string_list import Strings
 from .gtk_styles import Styles
 from .gtkbuilder_child import Child
 from .gtkbuilder_template import Template
+from .imports import GtkDirective, Import
 from .ui import UI
 from .values import IdentValue, TranslatedStringValue, FlagsValue, LiteralValue
 

blueprintcompiler/language/gobject_object.py

@@ -18,6 +18,7 @@
 # SPDX-License-Identifier: LGPL-3.0-or-later
 
 
+import typing as T
 from .common import *
 
 
@@ -41,11 +42,11 @@ class ObjectContent(AstNode):
             x.emit_xml(xml)
 
 class Object(AstNode):
-    grammar = Sequence(
+    grammar: T.Any = [
         class_name,
         Optional(UseIdent("id")),
         ObjectContent,
-    )
+    ]
 
     @validate("namespace")
     def gir_ns_exists(self):