Improve typing a bit

Author: tsterbak

openandroidinstaller/installer_config.py

@@ -15,6 +15,7 @@
 
 from pathlib import Path
 from typing import List, Optional
+from typing_extensions import Self
 
 import schema
 import yaml
@@ -67,7 +68,7 @@ def __init__(
         self.twrp_link = metadata.get("twrp-link")
 
     @classmethod
-    def from_file(cls, path):
+    def from_file(cls, path) -> Self:
         with open(path, "r", encoding="utf-8") as stream:
             try:
                 raw_config = yaml.safe_load(stream)

poetry.lock

@@ -29,6 +29,7 @@ pytest-mock = "^3.10.0"
 bandit = "^1.7.4"
 pytest-subprocess = "^1.5.0"
 mypy = "^1.0.0"
+typing-extensions = "^4.7.1"
 
 [tool.poetry.dev-dependencies]