Add mypy to pre-commit config

TODO: Switch back to PEP 695 type alias when supported by mypy (python/mypy#15238)

.pre-commit-config.yaml

@@ -10,3 +10,10 @@ repos:
       - id: ruff
         args: [--fix]
       - id: ruff-format
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v1.10.0
+    hooks:
+      - id: mypy
+        args: [--disable-error-code=import-untyped]
+        additional_dependencies:
+          [anyio, attrs, httpx, loguru, python-dateutil, tenacity]

main.py

@@ -6,7 +6,7 @@
 from asyncio import CancelledError
 from collections.abc import Callable, Iterable, Sequence
 from itertools import product
-from typing import Literal, Self
+from typing import Literal, Self, TypeAlias
 
 import httpx
 from anyio import create_task_group, run, sleep
@@ -28,7 +28,8 @@
 from flights import Availability
 from utils import beep, httpx_client, pretty_printer
 
-type DiffLine = tuple[Literal[" ", "+", "-"], Availability]
+# TODO: Switch back to PEP 695 type alias when supported by mypy (https://github.com/python/mypy/issues/15238)
+DiffLine: TypeAlias = tuple[Literal[" ", "+", "-"], Availability]
 
 
 @frozen