[ty] Handle aliased dict fallbacks in TypedDict unions#25241
Merged
Conversation
Typing conformance resultsNo changes detected ✅Current numbersThe percentage of diagnostics emitted that were expected errors held steady at 89.36%. The percentage of expected errors that received a diagnostic held steady at 85.49%. The number of fully passing files held steady at 88/134. |
Memory usage reportMemory usage unchanged ✅ |
|
dhruvmanila
approved these changes
May 19, 2026
thejchap
pushed a commit
to thejchap/ruff
that referenced
this pull request
May 23, 2026
## Summary
When a `TypedDict` union includes a `dict`-compatible fallback behind a
type alias, we need to resolve it, as in:
```python
type IntFloatDict = dict[int, float]
type TypedDictOrDictAlias = TD | IntFloatDict
value: TypedDictOrDictAlias = {1: 5.2}
```
There are some other similar bugs that I noticed while working on this,
which I'll fix in separate PRs.
Closes astral-sh/ty#3488.
anishgirianish
pushed a commit
to anishgirianish/ruff
that referenced
this pull request
May 28, 2026
## Summary
When a `TypedDict` union includes a `dict`-compatible fallback behind a
type alias, we need to resolve it, as in:
```python
type IntFloatDict = dict[int, float]
type TypedDictOrDictAlias = TD | IntFloatDict
value: TypedDictOrDictAlias = {1: 5.2}
```
There are some other similar bugs that I noticed while working on this,
which I'll fix in separate PRs.
Closes astral-sh/ty#3488.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary
When a
TypedDictunion includes adict-compatible fallback behind a type alias, we need to resolve it, as in:There are some other similar bugs that I noticed while working on this, which I'll fix in separate PRs.
Closes astral-sh/ty#3488.