No longer suggesting type alias as import

[JamesHutchison]

Type: Bug

Behaviour

Python no longer suggests type aliases from the project

Steps to reproduce:

Create type alias like this (TypeAlias type annotation doesn't matter):
Component: TypeAlias = VdomDict | ReactpyComponent | ContextProviderType | str

Go to some other file in the project and try ctrl + . to try to import it. It is not an option. It is not an option under "search for other import matches". Adding a class to the same file shows up. If you search for the name with ctrl + t it shows up as the first option.

If I enable "enable aliases in user files", it still does not show up.

I created a fresh codespace to rule out some sort of corruption somewhere.

Extension version: 2024.16.1
VS Code version: Code 1.94.2 (384ff7382de624fb94dbaf6da11977bba1ecd427, 2024-10-09T16:08:44.566Z)
OS version: Windows_NT x64 10.0.19045
Modes:
Remote OS version: Linux x64 6.5.0-1025-azure

• Python version (& distribution if applicable, e.g. Anaconda): 3.11.10
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Poetry
• Value of the python.languageServer setting: Default

User Settings

languageServer: "Pylance"

testing
• pytestArgs: "<placeholder>"
• pytestEnabled: true

experiments
• optOutFrom: ["pythonTestAdapter"]

Installed Extensions

Extension Name	Extension Id	Version
autoDocstring - Python Docstring Generator	njpwerner.autodocstring	0.6.1
autopep8	ms-python.autopep8	2024.0.0
Debugger for Java	vscjava.vscode-java-debug	0.58.0
Docker	ms-azuretools.vscode-docker	1.29.3
ESLint	dbaeumer.vscode-eslint	3.0.10
Even Better TOML	tamasfe.even-better-toml	0.19.2
Extension Pack for Java	vscjava.vscode-java-pack	0.29.0
Git Graph	mhutchie.git-graph	1.30.0
GitHub Copilot	GitHub.copilot	1.239.0
GitHub Copilot Chat	GitHub.copilot-chat	0.21.2
GitHub Pull Requests	GitHub.vscode-pull-request-github	0.98.0
GitHub Theme	GitHub.github-vscode-theme	6.3.5
GitLens — Git supercharged	eamodio.gitlens	15.6.1
Gradle for Java	vscjava.vscode-gradle	3.16.4
IntelliCode	VisualStudioExptTeam.vscodeintellicode	1.3.1
IntelliCode API Usage Examples	VisualStudioExptTeam.intellicode-api-usage-examples	0.2.8
JavaScript Debugger	ms-vscode.js-debug	1.94.0
Language Support for Java(TM) by Red Hat	redhat.java	1.35.1
Live Share	ms-vsliveshare.vsliveshare	1.0.5941
Maven for Java	vscjava.vscode-maven	0.44.0
Mypy	matangover.mypy	0.4.0
Project Manager for Java	vscjava.vscode-java-dependency	0.24.0
Pylance	ms-python.vscode-pylance	2024.10.1
Python	ms-python.python	2024.16.1
Python Debugger	ms-python.debugpy	2024.12.0
Ruff	charliermarsh.ruff	2024.50.0
SQLTools	mtxr.sqltools	0.28.3
SQLTools PostgreSQL/Cockroach Driver	mtxr.sqltools-driver-pg	0.5.4
Table Visualizer for JavaScript Profiles	ms-vscode.vscode-js-profile-table	1.0.10
Test Runner for Java	vscjava.vscode-java-test	0.42.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (8 x 2808)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	15.89GB (2.76GB free)
Process Argv	--crash-reporter-id ae591a24-d374-4309-8087-11db7f271645
Screen Reader	no
VM	0%

Item	Value
Remote	Codespaces: orange fiesta
OS	Linux x64 6.5.0-1025-azure
CPUs	AMD EPYC 7763 64-Core Processor (4 x 0)
Memory (System)	15.61GB (12.33GB free)
VM	0%

A/B Experiments

vsliv368cf:30146710
vspor879:30202332
vspor708:30202333
vspor363:30204092
vswsl492:30256859
vscod805cf:30301675
binariesv615:30325510
vsaa593:30376534
py29gd2263:31024239
c4g48928:30535728
azure-dev_surveyone:30548225
2i9eh265:30646982
962ge761:30959799
pythongtdpath:30769146
pythonnoceb:30805159
asynctok:30898717
pythonmypyd1:30879173
2e7ec940:31000449
pythontbext0:30879054
accentitlementsc:30995553
cppperfnew:31000557
dsvsc020:30976470
pythonait:31006305
dsvsc021:30996838
f3je6385:31013174
a69g1124:31058053
dvdeprecation:31068756
dwnewjupyter:31046869
2f103344:31071589
impr_priority:31102340
nativerepl2:31139839
refactort:31108082
pythonrstrctxt:31112756
wkspc-onlycs-t:31132770
wkspc-ranged-t:31151552
cf971741:31144450
defaultse:31146405
iacca2:31156134
notype1:31157159
showbadge:31153266
5fd0e150:31155592
iconenabled:31158251

[JamesHutchison]

So kind of weird behavior, here's what I've found:

Seems like downgrading to PyLance 2024.9.2 fixes the issue

If I downgrade then upgrade everything the issue doesn't seem apparent on my codebase
Python extension version doesn't seem relevant

Somehow I got it to where, in the process of changing versions and settings, was working using the latest of everything, but from a clean slate the latest version doesn't seem to work properly