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

[mfontana-elem]

@JamesHutchison

Thanks for reporting this, I thought I'd messed something up. If I understand correctly, you say that downgrading to 2024.9.2, restarting the extension, then going back to latest should work, right?

For me it did not, even after VSCode restarts, reboots, nothing. Funny thing is that if I enable "Enable aliases in user files" it offers to import it from other modules where it is itself imported, but not the place where it is defined.

I'll have to stick to 2024.9.2 for the time being, as we rely quite a lot on Type Aliases.