typing updates

jupyterlab_server/app.py

@@ -19,8 +19,8 @@ class LabServerApp(ExtensionAppJinjaMixin, LabConfig, ExtensionApp):
 
     name = "jupyterlab_server"
     extension_url = "/lab"
-    app_name = "JupyterLab Server Application"
-    file_url_prefix = "/lab/tree"  # type:ignore
+    app_name = "JupyterLab Server Application"  # type:ignore[assignment]
+    file_url_prefix = "/lab/tree"  # type:ignore[assignment]
 
     @property
     def app_namespace(self):

jupyterlab_server/licenses_handler.py

@@ -10,6 +10,7 @@
 import re
 from concurrent.futures import ThreadPoolExecutor
 from pathlib import Path
+from typing import TYPE_CHECKING
 
 from jupyter_server.base.handlers import APIHandler
 from tornado import gen, web
@@ -50,6 +51,10 @@ def federated_extensions(self):
         This is expensive, but probably the only way to be sure to get
         up-to-date license information for extensions installed interactively.
         """
+        if TYPE_CHECKING:
+            from .app import LabServerApp
+            assert isinstance(self.parent, LabServerApp)
+
         labextensions_path: list = sum(
             [
                 self.parent.labextensions_path,
@@ -200,6 +205,9 @@ def app_static_info(self):
         This will usually be in `static_dir`, but may also appear in the
         parent of `static_dir`.
         """
+        if TYPE_CHECKING:
+            from .app import LabServerApp
+            assert isinstance(self.parent, LabServerApp)
         path = Path(self.parent.static_dir)
         package_json = path / "package.json"
         if not package_json.exists():
@@ -253,6 +261,10 @@ async def get(self, _args):
             full_text=full_text,
         )
 
+        if TYPE_CHECKING:
+            from .app import LabServerApp
+            assert isinstance(self.manager.parent, LabServerApp)
+
         if download:
             filename = "{}-licenses{}".format(
                 self.manager.parent.app_name.lower(), mimetypes.guess_extension(mime)

jupyterlab_server/process_app.py

@@ -17,7 +17,7 @@ class ProcessApp(ExtensionAppJinjaMixin, LabConfig, ExtensionApp):
     load_other_extensions = True
 
     # Do not open a browser for process apps
-    open_browser = False
+    open_browser = False  # type:ignore[assignment]
 
     def get_command(self):
         """Get the command and kwargs to run with `Process`.

pyproject.toml

@@ -109,7 +109,7 @@ nowarn = "test -W default {args}"
 
 [tool.hatch.envs.typing]
 features = ["test"]
-dependencies = ["mypy>=1.5.1"]
+dependencies = ["mypy>=1.5.1", "traitlets>=5.11.2"]
 [tool.hatch.envs.typing.scripts]
 test = "mypy --install-types --non-interactive {args:jupyterlab_server tests}"