Add `type-checking` plugin to linting checks (#1629)

* add type-checking plugin for flakeheaven

* update lock file

* fix type-checking issues in current codebase

* run linters

3 files changed, 15 insertions, 7 deletions

diff --git a/jrnl/exception.py b/jrnl/exception.py
index 86140cd9..b4ec2be8 100644
--- a/jrnl/exception.py
+++ b/jrnl/exception.py
@@ -1,14 +1,18 @@
 # Copyright © 2012-2022 jrnl contributors
 # License: https://www.gnu.org/licenses/gpl-3.0.html
 
-from jrnl.messages import Message
+from typing import TYPE_CHECKING
+
 from jrnl.output import print_msg
 
+if TYPE_CHECKING:
+    from jrnl.messages import Message
+
 
 class JrnlException(Exception):
     """Common exceptions raised by jrnl."""
 
-    def __init__(self, *messages: Message):
+    def __init__(self, *messages: "Message"):
         self.messages = messages
 
     def print(self) -> None:
diff --git a/jrnl/messages/Message.py b/jrnl/messages/Message.py
index e4d6176a..bb193f5f 100644
--- a/jrnl/messages/Message.py
+++ b/jrnl/messages/Message.py
@@ -1,14 +1,17 @@
 # Copyright © 2012-2022 jrnl contributors
 # License: https://www.gnu.org/licenses/gpl-3.0.html
 
+from typing import TYPE_CHECKING
 from typing import Mapping
 from typing import NamedTuple
 
 from jrnl.messages.MsgStyle import MsgStyle
-from jrnl.messages.MsgText import MsgText
+
+if TYPE_CHECKING:
+    from jrnl.messages.MsgText import MsgText
 
 
 class Message(NamedTuple):
-    text: MsgText
+    text: "MsgText"
     style: MsgStyle = MsgStyle.NORMAL
     params: Mapping = {}
diff --git a/jrnl/override.py b/jrnl/override.py
index 4b6506ee..75a400b9 100644
--- a/jrnl/override.py
+++ b/jrnl/override.py
@@ -1,14 +1,15 @@
 # Copyright © 2012-2022 jrnl contributors
 # License: https://www.gnu.org/licenses/gpl-3.0.html
-
-from argparse import Namespace
+from typing import TYPE_CHECKING
 
 from jrnl.config import make_yaml_valid_dict
 from jrnl.config import update_config
 
+if TYPE_CHECKING:
+    from argparse import Namespace
 
 # import logging
-def apply_overrides(args: Namespace, base_config: dict) -> dict:
+def apply_overrides(args: "Namespace", base_config: dict) -> dict:
     """Unpack CLI provided overrides into the configuration tree.
 
     :param overrides: List of configuration key-value pairs collected from the CLI