diff --git a/pyproject.toml b/pyproject.toml
index ae0a8a47da0..629561c227c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -129,11 +129,7 @@ module = [
   'poetry.mixology.term',
   'poetry.mixology.version_solver',
   'poetry.repositories.installed_repository',
-  'poetry.utils.appdirs',
-  'poetry.utils.authenticator',
   'poetry.utils.env',
-  'poetry.utils.exporter',
-  'poetry.utils.password_manager',
   'poetry.utils.setup_reader',
 ]
 ignore_errors = true
diff --git a/src/poetry/utils/appdirs.py b/src/poetry/utils/appdirs.py
index ca6bb9a432d..476bd0231fa 100644
--- a/src/poetry/utils/appdirs.py
+++ b/src/poetry/utils/appdirs.py
@@ -7,17 +7,11 @@
 import os
 import sys
 
-from typing import TYPE_CHECKING
-
-
-if TYPE_CHECKING:
-    from pathlib import Path
-
 
 WINDOWS = sys.platform.startswith("win") or (sys.platform == "cli" and os.name == "nt")
 
 
-def expanduser(path: str | Path) -> str:
+def expanduser(path: str) -> str:
     """
     Expand ~ and ~user constructions.
 
@@ -214,14 +208,14 @@ def _get_win_folder_with_ctypes(csidl_name: str) -> str:
     }[csidl_name]
 
     buf = ctypes.create_unicode_buffer(1024)
-    ctypes.windll.shell32.SHGetFolderPathW(None, csidl_const, None, 0, buf)
+    ctypes.windll.shell32.SHGetFolderPathW(None, csidl_const, None, 0, buf)  # type: ignore[attr-defined]  # noqa: E501
 
     # Downgrade to short path name if have highbit chars. See
     # <http://bugs.activestate.com/show_bug.cgi?id=85099>.
     has_high_char = any(ord(c) > 255 for c in buf)
     if has_high_char:
         buf2 = ctypes.create_unicode_buffer(1024)
-        if ctypes.windll.kernel32.GetShortPathNameW(buf.value, buf2, 1024):
+        if ctypes.windll.kernel32.GetShortPathNameW(buf.value, buf2, 1024):  # type: ignore[attr-defined]  # noqa: E501
             buf = buf2
 
     return buf.value
diff --git a/src/poetry/utils/authenticator.py b/src/poetry/utils/authenticator.py
index a7d0dda3d89..9ceb53b7f90 100644
--- a/src/poetry/utils/authenticator.py
+++ b/src/poetry/utils/authenticator.py
@@ -19,6 +19,7 @@
     from cleo.io.io import IO
 
     from poetry.config.config import Config
+    from poetry.utils.types import Auth
 
 
 logger = logging.getLogger()
@@ -28,8 +29,8 @@ class Authenticator:
     def __init__(self, config: Config, io: IO | None = None) -> None:
         self._config = config
         self._io = io
-        self._session = None
-        self._credentials = {}
+        self._session: requests.Session | None = None
+        self._credentials: dict[str, tuple[str | None, str | None]] = {}
         self._password_manager = PasswordManager(self._config)
 
     def _log(self, message: str, level: str = "debug") -> None:
@@ -69,7 +70,7 @@ def request(self, method: str, url: str, **kwargs: Any) -> requests.Response:
         )
 
         # Send the request.
-        send_kwargs = {
+        send_kwargs: Any = {
             "timeout": kwargs.get("timeout"),
             "allow_redirects": kwargs.get("allow_redirects", True),
         }
@@ -117,11 +118,14 @@ def get_credentials_for_url(self, url: str) -> tuple[str | None, str | None]:
                 # Split from the left because that's how urllib.parse.urlsplit()
                 # behaves if more than one : is present (which again can be checked
                 # using the password attribute of the return value)
-                credentials = auth.split(":", 1) if ":" in auth else (auth, None)
-                credentials = tuple(
-                    None if x is None else urllib.parse.unquote(x) for x in credentials
+                credentials_tmp = auth.split(":", 1) if ":" in auth else (auth, None)
+                credentials_tmp = tuple(
+                    None if x is None else urllib.parse.unquote(x)
+                    for x in credentials_tmp
                 )
 
+                credentials = credentials_tmp[0], credentials_tmp[1]
+
         if credentials[0] is not None or credentials[1] is not None:
             credentials = (credentials[0] or "", credentials[1] or "")
 
@@ -132,10 +136,10 @@ def get_credentials_for_url(self, url: str) -> tuple[str | None, str | None]:
     def get_pypi_token(self, name: str) -> str:
         return self._password_manager.get_pypi_token(name)
 
-    def get_http_auth(self, name: str) -> dict[str, str] | None:
+    def get_http_auth(self, name: str) -> Auth | None:
         return self._get_http_auth(name, None)
 
-    def _get_http_auth(self, name: str, netloc: str | None) -> dict[str, str] | None:
+    def _get_http_auth(self, name: str, netloc: str | None) -> Auth | None:
         if name == "pypi":
             url = "https://upload.pypi.org/legacy/"
         else:
@@ -155,6 +159,7 @@ def _get_http_auth(self, name: str, netloc: str | None) -> dict[str, str] | None
                 )
 
             return auth
+        return None
 
     def _get_credentials_for_netloc(self, netloc: str) -> tuple[str | None, str | None]:
         for repository_name in self._config.get("repositories", []):
@@ -169,7 +174,7 @@ def _get_credentials_for_netloc(self, netloc: str) -> tuple[str | None, str | No
 
     def _get_credentials_for_netloc_from_keyring(
         self, url: str, netloc: str, username: str | None
-    ) -> dict[str, str] | None:
+    ) -> Auth | None:
         import keyring
 
         cred = keyring.get_credential(url, username)
diff --git a/src/poetry/utils/exporter.py b/src/poetry/utils/exporter.py
index 147b930fec2..6bced05e129 100644
--- a/src/poetry/utils/exporter.py
+++ b/src/poetry/utils/exporter.py
@@ -8,15 +8,15 @@
 
 from poetry.core.packages.utils.utils import path_to_url
 
+from poetry.repositories.remote_repository import RemoteRepository
 from poetry.utils._compat import decode
 
 
 if TYPE_CHECKING:
     from pathlib import Path
 
-    from cleo.io.io import IO
-
     from poetry.poetry import Poetry
+    from poetry.utils.types import Writer
 
 
 class Exporter:
@@ -36,7 +36,7 @@ def export(
         self,
         fmt: str,
         cwd: Path,
-        output: IO | str,
+        output: Writer | str,
         with_hashes: bool = True,
         dev: bool = False,
         extras: bool | Sequence[str] | None = None,
@@ -59,7 +59,7 @@ def export(
     def _export_requirements_txt(
         self,
         cwd: Path,
-        output: IO | str,
+        output: Writer | str,
         with_hashes: bool = True,
         dev: bool = False,
         extras: bool | Sequence[str] | None = None,
@@ -143,7 +143,7 @@ def _export_requirements_txt(
                 repositories = [
                     r
                     for r in self._poetry.pool.repositories
-                    if r.url == index.rstrip("/")
+                    if (isinstance(r, RemoteRepository) and r.url == index.rstrip("/"))
                 ]
                 if not repositories:
                     continue
@@ -151,6 +151,7 @@ def _export_requirements_txt(
                 if (
                     self._poetry.pool.has_default()
                     and repository is self._poetry.pool.repositories[0]
+                    and isinstance(repository, RemoteRepository)
                 ):
                     url = (
                         repository.authenticated_url
@@ -170,13 +171,13 @@ def _export_requirements_txt(
 
             content = indexes_header + "\n" + content
 
-        self._output(content, cwd, output)
+        self._write(content, cwd, output)
 
-    def _output(self, content: str, cwd: Path, output: IO | str) -> None:
+    def _write(self, content: str, cwd: Path, output: Writer | str) -> None:
         decoded = decode(content)
-        try:
-            output.write(decoded)
-        except AttributeError:
+        if isinstance(output, str):
             filepath = cwd / output
             with filepath.open("w", encoding="utf-8") as f:
                 f.write(decoded)
+            return
+        output.write(decoded)
diff --git a/src/poetry/utils/password_manager.py b/src/poetry/utils/password_manager.py
index fcef51d157e..6eb652bfbcb 100644
--- a/src/poetry/utils/password_manager.py
+++ b/src/poetry/utils/password_manager.py
@@ -8,6 +8,8 @@
 
 if TYPE_CHECKING:
     from poetry.config.config import Config
+    from poetry.utils.types import Auth
+
 
 logger = logging.getLogger(__name__)
 
@@ -121,10 +123,10 @@ def _check(self) -> None:
 class PasswordManager:
     def __init__(self, config: Config) -> None:
         self._config = config
-        self._keyring = None
+        self._keyring: KeyRing | None = None
 
     @property
-    def keyring(self) -> KeyRing | None:
+    def keyring(self) -> KeyRing:
         if self._keyring is None:
             self._keyring = KeyRing("poetry-repository")
             if not self._keyring.is_available():
@@ -141,18 +143,19 @@ def set_pypi_token(self, name: str, token: str) -> None:
             self.keyring.set_password(name, "__token__", token)
 
     def get_pypi_token(self, name: str) -> str:
-        if not self.keyring.is_available():
-            return self._config.get(f"pypi-token.{name}")
-
-        return self.keyring.get_password(name, "__token__")
+        token = self.keyring.get_password(name, "__token__")
+        if token is not None:
+            return token
+        return self._config.get(f"pypi-token.{name}")
 
     def delete_pypi_token(self, name: str) -> None:
         if not self.keyring.is_available():
-            return self._config.auth_config_source.remove_property(f"pypi-token.{name}")
+            self._config.auth_config_source.remove_property(f"pypi-token.{name}")
+            return
 
         self.keyring.delete_password(name, "__token__")
 
-    def get_http_auth(self, name: str) -> dict[str, str] | None:
+    def get_http_auth(self, name: str) -> Auth | None:
         auth = self._config.get(f"http-basic.{name}")
         if not auth:
             username = self._config.get(f"http-basic.{name}.username")
@@ -181,7 +184,7 @@ def set_http_password(self, name: str, username: str, password: str) -> None:
 
     def delete_http_password(self, name: str) -> None:
         auth = self.get_http_auth(name)
-        if not auth or "username" not in auth:
+        if auth is None or "username" not in auth:
             return
 
         with suppress(KeyRingError):
diff --git a/src/poetry/utils/setup_reader.py b/src/poetry/utils/setup_reader.py
index baac42c12ff..dbb9fd104a4 100644
--- a/src/poetry/utils/setup_reader.py
+++ b/src/poetry/utils/setup_reader.py
@@ -312,6 +312,7 @@ def _find_single_string(
 
             if variable is not None and isinstance(variable, ast.Str):
                 return variable.s
+        return None
 
     def _find_in_call(self, call: ast.Call, name: str) -> Any | None:
         for keyword in call.keywords:
@@ -342,8 +343,9 @@ def _find_variable_in_body(self, body: Iterable[Any], name: str) -> Any | None:
 
                 if target.id == name:
                     return elem.value
+        return None
 
-    def _find_in_dict(self, dict_: ast.Dict | ast.Call, name: str) -> Any | None:
+    def _find_in_dict(self, dict_: ast.Dict, name: str) -> Any | None:
         for key, val in zip(dict_.keys, dict_.values):
             if isinstance(key, ast.Str) and key.s == name:
                 return val
diff --git a/src/poetry/utils/types.py b/src/poetry/utils/types.py
new file mode 100644
index 00000000000..be38071fd42
--- /dev/null
+++ b/src/poetry/utils/types.py
@@ -0,0 +1,14 @@
+from __future__ import annotations
+
+from typing import Protocol
+from typing import TypedDict
+
+
+class Auth(TypedDict):
+    username: str
+    password: str | None
+
+
+class Writer(Protocol):
+    def write(self, text: str) -> None:
+        pass