## Summary
This PR adds a new lint, `invalid-await`, for all sorts of reasons why
an object may not be `await`able, as discussed in astral-sh/ty#919.
Precisely, `__await__` is guarded against being missing, possibly
unbound, or improperly defined (expects additional arguments or doesn't
return an iterator).
Of course, diagnostics need to be fine-tuned. If `__await__` cannot be
called with no extra arguments, it indicates an error (or a quirk?) in
the method signature, not at the call site. Without any doubt, such an
object is not `Awaitable`, but I feel like talking about arguments for
an *implicit* call is a bit leaky.
I didn't reference any actual diagnostic messages in the lint
definition, because I want to hear feedback first.
Also, there's no mention of the actual required method signature for
`__await__` anywhere in the docs. The only reference I had is the
`typing` stub. I basically ended up linking `[Awaitable]` to ["must
implement
`__await__`"](https://docs.python.org/3/library/collections.abc.html#collections.abc.Awaitable),
which is insufficient on its own.
## Test Plan
The following code was tested:
```python
import asyncio
import typing
class Awaitable:
def __await__(self) -> typing.Generator[typing.Any, None, int]:
yield None
return 5
class NoDunderMethod:
pass
class InvalidAwaitArgs:
def __await__(self, value: int) -> int:
return value
class InvalidAwaitReturn:
def __await__(self) -> int:
return 5
class InvalidAwaitReturnImplicit:
def __await__(self):
pass
async def main() -> None:
result = await Awaitable() # valid
result = await NoDunderMethod() # `__await__` is missing
result = await InvalidAwaitReturn() # `__await__` returns `int`, which is not a valid iterator
result = await InvalidAwaitArgs() # `__await__` expects additional arguments and cannot be called implicitly
result = await InvalidAwaitReturnImplicit() # `__await__` returns `Unknown`, which is not a valid iterator
asyncio.run(main())
```
---------
Co-authored-by: Carl Meyer <carl@astral.sh>
## Summary
This PR renames `ty.inlayHints.functionArgumentNames` to
`ty.inlayHints.callArgumentNames` which would contain both function
calls and class initialization calls i.e., it represents a generic call
expression.
## Summary
This PR changes the default of `ty.inlayHints.*` settings to `true`.
I somehow missed this in my initial PR.
This is marked as `internal` because it's not yet released.
## Summary
For PEP 695 generic functions and classes, there is an extra "type
params scope" (a child of the outer scope, and wrapping the body scope)
in which the type parameters are defined; class bases and function
parameter/return annotations are resolved in that type-params scope.
This PR fixes some longstanding bugs in how we resolve name loads from
inside these PEP 695 type parameter scopes, and also defers type
inference of PEP 695 typevar bounds/constraints/default, so we can
handle cycles without panicking.
We were previously treating these type-param scopes as lazy nested
scopes, which is wrong. In fact they are eager nested scopes; the class
`C` here inherits `int`, not `str`, and previously we got that wrong:
```py
Base = int
class C[T](Base): ...
Base = str
```
But certain syntactic positions within type param scopes (typevar
bounds/constraints/defaults) are lazy at runtime, and we should use
deferred name resolution for them. This also means they can have cycles;
in order to handle that without panicking in type inference, we need to
actually defer their type inference until after we have constructed the
`TypeVarInstance`.
PEP 695 does specify that typevar bounds and constraints cannot be
generic, and that typevar defaults can only reference prior typevars,
not later ones. This reduces the scope of (valid from the type-system
perspective) cycles somewhat, although cycles are still possible (e.g.
`class C[T: list[C]]`). And this is a type-system-only restriction; from
the runtime perspective an "invalid" case like `class C[T: T]` actually
works fine.
I debated whether to implement the PEP 695 restrictions as a way to
avoid some cycles up-front, but I ended up deciding against that; I'd
rather model the runtime name-resolution semantics accurately, and
implement the PEP 695 restrictions as a separate diagnostic on top.
(This PR doesn't yet implement those diagnostics, thus some `# TODO:
error` in the added tests.)
Introducing the possibility of cyclic typevars made typevar display
potentially stack overflow. For now I've handled this by simply removing
typevar details (bounds/constraints/default) from typevar display. This
impacts display of two kinds of types. If you `reveal_type(T)` on an
unbound `T` you now get just `typing.TypeVar` instead of
`typing.TypeVar("T", ...)` where `...` is the bound/constraints/default.
This matches pyright and mypy; pyrefly uses `type[TypeVar[T]]` which
seems a bit confusing, but does include the name. (We could easily
include the name without cycle issues, if there's a syntax we like for
that.)
It also means that displaying a generic function type like `def f[T:
int](x: T) -> T: ...` now displays as `f[T](x: T) -> T` instead of `f[T:
int](x: T) -> T`. This matches pyright and pyrefly; mypy does include
bound/constraints/defaults of typevars in function/callable type
display. If we wanted to add this, we would either need to thread a
visitor through all the type display code, or add a `decycle` type
transformation that replaced recursive reoccurrence of a type with a
marker.
## Test Plan
Added mdtests and modified existing tests to improve their correctness.
After this PR, there's only a single remaining py-fuzzer seed in the
0-500 range that panics! (Before this PR, there were 10; the fuzzer
likes to generate cyclic PEP 695 syntax.)
## Ecosystem report
It's all just the changes to `TypeVar` display.
This PR adds a type tag to the `CycleDetector` visitor (and its
aliases).
There are some places where we implement e.g. an equivalence check by
making a disjointness check. Both `is_equivalent_to` and
`is_disjoint_from` use a `PairVisitor` to handle cycles, but they should
not use the same visitor. I was finding it tedious to remember when it
was appropriate to pass on a visitor and when not to. This adds a
`PhantomData` type tag to ensure that we can't pass on one method's
visitor to a different method.
For `has_relation` and `apply_type_mapping`, we have an existing type
that we can use as the tag. For the other methods, I've added empty
structs (`Normalized`, `IsDisjointFrom`, `IsEquivalentTo`) to use as
tags.
## Summary
- Refactored `BLE001` logic for clarity and minor speed-up.
- Improved documentation and comments (previously, `BLE001` docs claimed
it catches bare `except:`s, but it doesn't).
- Fixed a false-positive bug with `from None` cause:
```python
# somefile.py
try:
pass
except BaseException as e:
raise e from None
```
### main branch
```
somefile.py:3:8: BLE001 Do not catch blind exception: `BaseException`
|
1 | try:
2 | pass
3 | except BaseException as e:
| ^^^^^^^^^^^^^ BLE001
4 | raise e from None
|
Found 1 error.
```
### this change
```cargo run -p ruff -- check somefile.py --no-cache --select=BLE001```
```
All checks passed!
```
## Test Plan
- Added a test case to cover `raise X from Y` clause
- Added a test case to cover `raise X from None` clause
This also reintroduces the `ResolvedDefinition::Module` variant because
reverse-engineering it in several places is a bit confusing. In an ideal
world we wouldn't have `ResolvedDefinition::FileWithRange` as it kinda
kills the ability to do richer analysis, so I want to chip away at its
scope wherever I can (currently it's used to point at asname parts of
import statements when doing `ImportAliasResolution::PreserveAliases`,
and also keyword arguments).
This also makes a kind of odd change to allow a hover to *only* produce
a docstring. This works around an oddity where hovering over a module
name in an import fails to resolve to a `ty` even though hovering over
uses of that imported name *does*.
The two fixed tests reflect the two interesting cases here.
## Summary
Fixes#19881. While I was here, I also made a couple of related tweaks
to the output format. First, we don't need to strip the `SyntaxError: `
prefix anymore since that's not added directly to the diagnostic message
after #19644. Second, we can use `secondary_code_or_id` to fall back on
the lint ID for syntax errors, which changes the `check_name` from
`syntax-error` to `invalid-syntax`. And then the main change requested
in the issue, prepending the `check_name` to the description.
## Test Plan
Existing tests and a new screenshot from GitLab:
<img width="362" height="113" alt="image"
src="https://github.com/user-attachments/assets/97654ad4-a639-4489-8c90-8661c7355097"
/>
This PR has several components:
* Introduce a Docstring String wrapper type that has render_plaintext
and render_markdown methods, to force docstring handlers to pick a
rendering format
* Implement [PEP-257](https://peps.python.org/pep-0257/) docstring
trimming for it
* The markdown rendering just renders the content in a plaintext
codeblock for now (followup work)
* Introduce a `DefinitionsOrTargets` type representing the partial
evaluation of `GotoTarget::get_definition_targets` to ideally stop at
getting `ResolvedDefinitions`
* Add `declaration_targets`, `definition_targets`, and `docstring`
methods to `DefinitionsOrTargets` for the 3 usecases we have for this
operation
* `docstring` is of course the key addition here, it uses the same basic
logic that `signature_help` was using: first check the goto-declaration
for docstrings, then check the goto-definition for docstrings.
* Refactor `signature_help` to use the new APIs instead of implementing
it itself
* Not fixed in this PR: an issue I found where `signature_help` will
erroneously cache docs between functions that have the same type (hover
docs don't have this bug)
* A handful of new tests and additions to tests to add docstrings in
various places and see which get caught
Examples of it working with stdlib, third party, and local definitions:
<img width="597" height="120" alt="Screenshot 2025-08-12 at 2 13 55 PM"
src="https://github.com/user-attachments/assets/eae54efd-882e-4b50-b5b4-721595224232"
/>
<img width="598" height="281" alt="Screenshot 2025-08-12 at 2 14 06 PM"
src="https://github.com/user-attachments/assets/5c9740d5-a06b-4c22-9349-da6eb9a9ba5a"
/>
<img width="327" height="180" alt="Screenshot 2025-08-12 at 2 14 18 PM"
src="https://github.com/user-attachments/assets/3b5647b9-2cdd-4c5b-bb7d-da23bff1bcb5"
/>
Notably modules don't work yet (followup work):
<img width="224" height="83" alt="Screenshot 2025-08-12 at 2 14 37 PM"
src="https://github.com/user-attachments/assets/7e9dcb70-a10e-46d9-a85c-9fe52c3b7e7b"
/>
Notably we don't show docs for an item if you hover its actual
definition (followup work, but also, not the most important):
<img width="324" height="69" alt="Screenshot 2025-08-12 at 2 16 54 PM"
src="https://github.com/user-attachments/assets/d4ddcdd8-c3fc-4120-ac93-cefdf57933b4"
/>
## Summary
A [passing
comment](https://github.com/astral-sh/ruff/pull/19711#issuecomment-3169312014)
led me to explore why we didn't report a class attribute as possibly
unbound if it was a method and defined in two different conditional
branches.
I found that the reason was because of our handling of "conflicting
declarations" in `place_from_declarations`. It returned a `Result` which
would be `Err` in case of conflicting declarations.
But we only actually care about conflicting declarations when we are
actually doing type inference on that scope and might emit a diagnostic
about it. And in all cases (including that one), we want to otherwise
proceed with the union of the declared types, as if there was no
conflict.
In several cases we were failing to handle the union of declared types
in the same way as a normal declared type if there was a declared-types
conflict. The `Result` return type made this mistake really easy to
make, as we'd match on e.g. `Ok(Place::Type(...))` and do one thing,
then match on `Err(...)` and do another, even though really both of
those cases should be handled the same.
This PR refactors `place_from_declarations` to instead return a struct
which always represents the declared type we should use in the same way,
as well as carrying the conflicting declared types, if any. This struct
has a method to allow us to explicitly ignore the declared-types
conflict (which is what we want in most cases), as well as a method to
get the declared type and the conflict information, in the case where we
want to emit a diagnostic on the conflict.
## Test Plan
Existing CI; added a test showing that we now understand a
multiply-conditionally-defined method as possibly-unbound.
This does trigger issues on a couple new fuzzer seeds, but the issues
are just new instances of an already-known (and rarely occurring)
problem which I already plan to address in a future PR, so I think it's
OK to land as-is.
I happened to build this initially on top of
https://github.com/astral-sh/ruff/pull/19711, which adds invalid-await
diagnostics, so I also updated some invalid-syntax tests to not await on
an invalid type, since the purpose of those tests is to check the
syntactic location of the `await`, not the validity of the awaited type.
Summary
--
To take advantage of the new diagnostics, we need to update our caching
model to include all of the information supported by `ruff_db`'s
diagnostic type. Instead of trying to serialize all of this information,
Micha suggested simply not caching files with diagnostics, like we
already do for files with syntax errors. This PR is an attempt at that
approach.
This has the added benefit of trimming down our `Rule` derives since
this was the last place the `FromStr`/`strum_macros::EnumString`
implementation was used, as well as the (de)serialization macros and
`CacheKey`.
Test Plan
--
Existing tests, with their input updated not to include a diagnostic,
plus a new test showing that files with lint diagnostics are not cached.
Benchmarks
--
In addition to tests, we wanted to check that this doesn't degrade
performance too much. I posted part of this new analysis in
https://github.com/astral-sh/ruff/issues/18198#issuecomment-3175048672,
but I'll duplicate it here. In short, there's not much difference
between `main` and this branch for projects with few diagnostics
(`home-assistant`, `airflow`), as expected. The difference for projects
with many diagnostics (`cpython`) is quite a bit bigger (~300 ms vs ~220
ms), but most projects that run ruff regularly are likely to have very
few diagnostics, so this may not be a problem practically.
I guess GitHub isn't really rendering this as I intended, but the extra
separator line is meant to separate the benchmarks on `main` (above the
line) from this branch (below the line).
| Command | Mean [ms] | Min [ms] | Max [ms] |
|:--------------------------------------------------------------|----------:|---------:|---------:|
| `ruff check cpython --no-cache --isolated --exit-zero` | 322.0 | 317.5
| 326.2 |
| `ruff check cpython --isolated --exit-zero` | 217.3 | 209.8 | 237.9 |
| `ruff check home-assistant --no-cache --isolated --exit-zero` | 279.5
| 277.0 | 283.6 |
| `ruff check home-assistant --isolated --exit-zero` | 37.2 | 35.7 |
40.6 |
| `ruff check airflow --no-cache --isolated --exit-zero` | 133.1 | 130.4
| 146.4 |
| `ruff check airflow --isolated --exit-zero` | 34.7 | 32.9 | 41.6 |
|:--------------------------------------------------------------|----------:|---------:|---------:|
| `ruff check cpython --no-cache --isolated --exit-zero` | 330.1 | 324.5
| 333.6 |
| `ruff check cpython --isolated --exit-zero` | 309.2 | 306.1 | 314.7 |
| `ruff check home-assistant --no-cache --isolated --exit-zero` | 288.6
| 279.4 | 302.3 |
| `ruff check home-assistant --isolated --exit-zero` | 39.8 | 36.9 |
42.4 |
| `ruff check airflow --no-cache --isolated --exit-zero` | 134.5 | 131.3
| 140.6 |
| `ruff check airflow --isolated --exit-zero` | 39.1 | 37.2 | 44.3 |
I had Claude adapt one of the
[scripts](https://github.com/sharkdp/hyperfine/blob/master/scripts/plot_whisker.py)
from the hyperfine repo to make this plot, so it's not quite perfect,
but maybe it's still useful. The table is probably more reliable for
close comparisons. I'll put more details about the benchmarks below for
the sake of future reproducibility.
<img width="4472" height="2368" alt="image"
src="https://github.com/user-attachments/assets/1c42d13e-818a-44e7-b34c-247340a936d7"
/>
<details><summary>Benchmark details</summary>
<p>
The versions of each project:
- CPython: 6322edd260e8cad4b09636e05ddfb794a96a0451, the 3.10 branch
from the contributing docs
- `home-assistant`: 5585376b406f099fb29a970b160877b57e5efcb0
- `airflow`: 29a1cb0cfde9d99b1774571688ed86cb60123896
The last two are just the main branches at the time I cloned the repos.
I don't think our Ruff config should be applied since I used
`--isolated`, but these are cloned into my copy of Ruff at
`crates/ruff_linter/resources/test`, and I trimmed the
`./target/release/` prefix from each of the commands, but these are
builds of Ruff in release mode.
And here's the script with the `hyperfine` invocation:
```shell
#!/bin/bash
cargo build --release --bin ruff
# git clone --depth 1 https://github.com/home-assistant/core crates/ruff_linter/resources/test/home-assistant
# git clone --depth 1 https://github.com/apache/airflow crates/ruff_linter/resources/test/airflow
bin=./target/release/ruff
resources=./crates/ruff_linter/resources/test
cpython=$resources/cpython
home_assistant=$resources/home-assistant
airflow=$resources/airflow
base=${1:-bench}
hyperfine --warmup 10 --export-json $base.json --export-markdown $base.md \
"$bin check $cpython --no-cache --isolated --exit-zero" \
"$bin check $cpython --isolated --exit-zero" \
"$bin check $home_assistant --no-cache --isolated --exit-zero" \
"$bin check $home_assistant --isolated --exit-zero" \
"$bin check $airflow --no-cache --isolated --exit-zero" \
"$bin check $airflow --isolated --exit-zero"
```
I ran this once on `main` (`baseline` in the graph, top half of the
table) and once on this branch (`nocache` and bottom of the table).
</p>
</details>
## Summary
Support recursive type aliases by adding a `Type::TypeAlias` type
variant, which allows referring to a type alias directly as a type
without eagerly unpacking it to its value.
We still unpack type aliases when they are added to intersections and
unions, so that we can simplify the intersection/union appropriately
based on the unpacked value of the type alias.
This introduces new possible recursive types, and so also requires
expanding our usage of recursion-detecting visitors in Type methods. The
use of these visitors is still not fully comprehensive in this PR, and
will require further expansion to support recursion in more kinds of
types (I already have further work on this locally), but I think it may
be better to do this incrementally in multiple PRs.
## Test Plan
Added some recursive type-alias tests and made them pass.
## Summary
After https://github.com/astral-sh/ruff/pull/19871, I realized that now
that we are passing around shared references to `CycleDetector`
visitors, we can now also simplify the `visit` callback signature; we
don't need to smuggle a single visitor reference through it anymore.
This is a pretty minor simplification, and it doesn't really make
anything shorter since I typically used a very short name (`v`) for the
smuggled reference, but I think it reduces cognitive overhead in reading
these `visit` usages; the extra variable would likely be confusing
otherwise for a reader.
## Test Plan
Existing CI.
## Summary
Type visitors are conceptually immutable, they just internally track the
types they've seen (and some maintain a cache of results.) Passing
around mutable visitors everywhere can get us into borrow-checker
trouble in some cases, where we need to recursively pass along the
visitor inside more than one closure with non-disjoint lifetime.
Use interior mutability (via `RefCell` and `Cell`) inside the visitors
instead, to allow us to pass around shared references.
## Test Plan
Existing tests.
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## Summary
Add "airflow.secrets.cache.SecretCache" →
"airflow.sdk.cache.SecretCache" rule
<!-- What's the purpose of the change? What does it do, and why? -->
## Test Plan
<!-- How was it tested? -->
---------
Co-authored-by: Wei Lee <weilee.rx@gmail.com>
Summary
--
This fixes a regression caused by the BOM handling in #19806. Most
diagnostics already account for the BOM in their ranges, but those that
use `TextRange::default` to mean the beginning of the file do not,
causing an underflow in `RenderableAnnotation::new` when subtracting the
BOM-shifted `snippet_start` from the annotation range.
I ran into this when trying to run benchmarks on CPython in preparation
for caching work. The file `cpython/Lib/test/bad_coding2.py` was causing
a crash because it had a default-range `I002` diagnostic, with a BOM.
7cc3f1ebe9/crates/ruff_linter/src/rules/isort/rules/add_required_imports.rs (L122-L126)
The fix here is just to saturate to zero instead of panicking. I
considered adding a `TextRange::saturating_sub` method, but I wasn't
sure it was worth it for this one use. I'm happy to do that if
preferred, though.
Saturating seemed easier than shifting the affected annotations over,
but that could be another solution.
Test Plan
--
A new `ruff_db` test that reproduced the issue and manual testing
against the CPython file mentioned above
## Summary
This is a follow-up to
https://github.com/astral-sh/ruff/pull/19415#discussion_r2263456740 to
remove some unused code. As Micha noticed,
`GroupedEmitter::with_show_source` was only used in local unit tests[^1]
and was safe to remove. This allowed deleting `MessageCodeFrame` and a
lot more helper code previously shared with the `full` output format.
I also moved some other code from `text.rs` and `message/mod.rs` into
`grouped.rs` that is now only used for the `grouped` format. With a
little refactoring of the `concise` rendering logic in `ruff_db`, we
could probably remove `RuleCodeAndBody` too. The only difference I see
from the `concise` output is whether we print the filename next to the
row and column or not:
```shell
> ruff check --output-format concise
try.py:1:8: F401 [*] `math` imported but unused
> ruff check --output-format grouped
try.py:
1:8 F401 [*] `math` imported but unused
```
But I didn't try to do that here.
## Test Plan
Existing tests, with the source code no longer displayed. I also deleted
one test, as it was now a duplicate of the `default` test.
[^1]: "Local unit tests" as opposed to all of our linter snapshot tests,
as is the case for `TextEmitter::with_show_fix_diff`. We also want to
expose that to users eventually
(https://github.com/astral-sh/ruff/issues/7352), which I don't believe
is the case for the `grouped` format.
The [minimal
reproduction](https://gist.github.com/dcreager/fc53c59b30d7ce71d478dcb2c1c56444)
of https://github.com/astral-sh/ty/issues/948 is an example of a class
with implicit attributes whose types end up depending on themselves. Our
existing cycle detection for `infer_expression_types` is usually enough
to handle this situation correctly, but when there are very many of
these implicit attributes, we get a combinatorial explosion of running
time and memory usage.
Adding a separate cycle handler for `ClassLiteral::implicit_attribute`
lets us catch and recover from this situation earlier.
Closes https://github.com/astral-sh/ty/issues/948
The stub mapper wasn't being passed into this codepath. It is now being
used. A previously messed up test result I intentionally checked in was
subsequently fixed.
by using essentially the same logic for system site-packages, on the
assumption that system site-packages are always a subdir of the stdlib
we were looking for.
fix https://github.com/astral-sh/ty/issues/943
## Summary
Add module-level `__getattr__` support for ty's type checker, fixing
issue https://github.com/astral-sh/ty/issues/943.
Module-level `__getattr__` functions ([PEP
562](https://peps.python.org/pep-0562/)) are now respected when
resolving dynamic attributes, matching the behavior of mypy and pyright.
## Implementation
Thanks @sharkdp for the guidance in
https://github.com/astral-sh/ty/issues/943#issuecomment-3157566579
- Adds module-specific `__getattr__` resolution in
`ModuleLiteral.static_member()`
- Maintains proper attribute precedence: explicit attributes >
submodules > `__getattr__`
## Test Plan
- New mdtest covering basic functionality, type annotations, attribute
precedence, and edge cases
(run ```cargo nextest run -p ty_python_semantic
mdtest__import_module_getattr```)
- All new tests pass, verifying `__getattr__` is called correctly and
returns proper types
- Existing test suite passes, ensuring no regressions introduced
## Summary
This PR switches the `full` output format in Ruff over to use the
rendering code
in `ruff_db`. As proposed in the design doc, this involves a lot of
changes to the snapshot output.
I also had to comment out this assertion with a TODO to replace it after
https://github.com/astral-sh/ruff/issues/19688 because many of Ruff's
"file-level" annotations aren't actually file-level. They just happen to
occur at the start of the file, especially in tests with very short
snippets.
529d81daca/crates/ruff_annotate_snippets/src/renderer/display_list.rs (L1204-L1208)
I broke up the snapshot commits at the end into several blocks, but I
don't think it's enough to help with review. The first few (notebooks,
syntax errors, and test rules) are small enough to look at, but I
couldn't really think of other categories beyond that. I'm happy to
break those up or pick out specific examples beyond what I have below,
if that would help.
The minimal code changes are in this
[range](abd28f1e77),
with the snapshot commits following. Moving the `FullRenderer` and
updating the `EmitterFlags` aren't strictly necessary either. I even
dropped the renderer commit this morning but figured it made sense to
keep it since we have the `full` module for tests. I don't feel strongly
either way.
## Test Plan
I did actually click through all 1700 snapshots individually instead of
accepting them all at once, although I moved through them quickly. There
are a
few main categories:
### Lint diagnostics
```diff
-unused.py:8:19: F401 [*] `pathlib` imported but unused
+F401 [*] `pathlib` imported but unused
+ --> unused.py:8:19
|
7 | # Unused, _not_ marked as required (due to the alias).
8 | import pathlib as non_alias
- | ^^^^^^^^^ F401
+ | ^^^^^^^^^
9 |
10 | # Unused, marked as required.
|
- = help: Remove unused import: `pathlib`
+help: Remove unused import: `pathlib`
```
- The filename and line numbers are moved to the second line
- The second noqa code next to the underline is removed
### Syntax errors
These are much like the above.
```diff
- -:1:16: invalid-syntax: Expected one or more symbol names after import
+ invalid-syntax: Expected one or more symbol names after import
+ --> -:1:16
|
1 | from foo import
| ^
```
One thing I noticed while reviewing some of these, but I don't think is
strictly syntax-error-related, is that some of the new diagnostics have
a little less context after the error. I don't think this is a problem,
but it's one small discrepancy I hadn't noticed before. Here's a minor
example:
```diff
-syntax_errors.py:1:15: invalid-syntax: Expected one or more symbol names after import
+invalid-syntax: Expected one or more symbol names after import
+ --> syntax_errors.py:1:15
|
1 | from os import
| ^
2 |
3 | if call(foo
-4 | def bar():
|
```
And one of the biggest examples:
```diff
-E30_syntax_error.py:18:11: invalid-syntax: Expected ')', found newline
+invalid-syntax: Expected ')', found newline
+ --> E30_syntax_error.py:18:11
|
16 | pass
17 |
18 | foo = Foo(
| ^
-19 |
-20 |
-21 | def top(
|
```
Similarly, a few of the lint diagnostics showed that the cut indicator
calculation for overly long lines is also slightly different, but I
think that's okay too.
### Full-file diagnostics
```diff
-comment.py:1:1: I002 [*] Missing required import: `from __future__ import annotations`
+I002 [*] Missing required import: `from __future__ import annotations`
+--> comment.py:1:1
+help: Insert required import: `from __future__ import annotations`
+
```
As noted above, these will be much more rare after #19688 too. This case
isn't a true full-file diagnostic and will render a snippet in the
future, but you can see that we're now rendering the help message that
would have been discarded before. In contrast, this is a true full-file
diagnostic and should still look like this after #19688:
```diff
-__init__.py:1:1: A005 Module `logging` shadows a Python standard-library module
+A005 Module `logging` shadows a Python standard-library module
+--> __init__.py:1:1
```
### Jupyter notebooks
There's nothing particularly different about these, just showing off the
cell index again.
```diff
- Jupyter.ipynb:cell 3:1:7: F821 Undefined name `x`
+ F821 Undefined name `x`
+ --> Jupyter.ipynb:cell 3:1:7
|
1 | print(x)
- | ^ F821
+ | ^
|
```
## Summary
Fixes the remaining range reporting differences between the `ruff_db`
diagnostic rendering and Ruff's existing rendering, as noted in
https://github.com/astral-sh/ruff/pull/19415#issuecomment-3160525595.
This PR is structured as a series of three pairs. The first commit in
each pair adds a test showing the previous behavior, followed by a fix
and the updated snapshot. It's quite a small PR, but that might be
helpful just for the contrast.
You can also look at [this
range](052e656c6c..c3ea51030d)
of commits from #19415 to see the impact on real Ruff diagnostics. I
spun these commits out of that PR.
## Test Plan
New `ruff_db` tests
PLE2513 --fix changes ESC and SUB to uppercase hexadecimal values such
as \x1B while the formatter changes them to lowercase \x1b
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## Summary
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---------
Co-authored-by: Brent Westbrook <brentrwestbrook@gmail.com>
## Summary
This is a small refactor to update the server to send a single request
to perform registrations and unregistrations of dynamic capabilities.
## Test Plan
Existing E2E test cases pass, add a new test case to verify multiple
registrations.
## Summary
Reported in:
https://github.com/astral-sh/ruff/pull/19795#issuecomment-3161981945
If a root expression is reassigned, narrowing on the member should be
invalidated, but there was an oversight in the current implementation.
This PR fixes that, and also removes some unnecessary handling.
## Test Plan
New tests cases in `narrow/conditionals/nested.md`.
## Summary
This PR adds a new `ty.inlayHints.variableTypes` server setting to
configure ty to include / exclude inlay hints at variable position.
Currently, we only support inlay hints at this position so this option
basically translates to enabling / disabling inlay hints for now :)
The VS Code extension PR is
https://github.com/astral-sh/ty-vscode/pull/112.
closes: astral-sh/ty#472
## Test Plan
Add E2E tests.
## Summary
This PR is a follow-up from https://github.com/astral-sh/ruff/pull/19551
and adds a new `ty.experimental.rename` setting to conditionally
register for the rename capability. The complementary PR in ty VS Code
extension is https://github.com/astral-sh/ty-vscode/pull/111.
This is done using dynamic registration after the settings have been
resolved. The experimental group is part of the global settings because
they're applied for all workspaces that are managed by the client.
## Test Plan
Add E2E tests.
In VS Code, with the following setting:
```json
{
"ty.experimental.rename": "true",
"python.languageServer": "None"
}
```
I get the relevant log entry:
```
2025-08-07 16:05:40.598709000 DEBUG client_response{id=3 method="client/registerCapability"}: Registered rename capability
```
And, I'm able to rename a symbol. Once I set it to `false`, then I can
see this log entry:
```
2025-08-07 16:08:39.027876000 DEBUG Rename capability is disabled in the client settings
```
And, I don't see the "Rename Symbol" open in the VS Code dropdown.
https://github.com/user-attachments/assets/501659df-ba96-4252-bf51-6f22acb4920b
This PR adds support for the "rename" language server feature. It builds
upon existing functionality used for "go to references".
The "rename" feature involves two language server requests. The first is
a "prepare rename" request that determines whether renaming should be
possible for the identifier at the current offset. The second is a
"rename" request that returns a list of file ranges where the rename
should be applied.
Care must be taken when attempting to rename symbols that span files,
especially if the symbols are defined in files that are not part of the
project. We don't want to modify code in the user's Python environment
or in the vendored stub files.
I found a few bugs in the "go to references" feature when implementing
"rename", and those bug fixes are included in this PR.
---------
Co-authored-by: UnboundVariable <unbound@gmail.com>
## Summary
As per our naming scheme (at least for callable types) this should
return a `BoundMethodType`, or be renamed, but it makes more sense to
change the return type.
I also ensure `ClassType.into_callable` returns a `Type::Callable` in
the changed branch.
Ideally we could return a `CallableType` from these `into_callable`
functions (and rename to `into_callable_type` but because of unions we
cannot do this.
## Summary
Validates writes to `TypedDict` keys, for example:
```py
class Person(TypedDict):
name: str
age: int | None
def f(person: Person):
person["naem"] = "Alice" # error: [invalid-key]
person["age"] = "42" # error: [invalid-assignment]
```
The new specialized `invalid-assignment` diagnostic looks like this:
<img width="1160" height="279" alt="image"
src="https://github.com/user-attachments/assets/51259455-3501-4829-a84e-df26ff90bd89"
/>
## Ecosystem analysis
As far as I can tell, all true positives!
There are some extremely long diagnostic messages. We should truncate
our display of overload sets somehow.
## Test Plan
New Markdown tests
## Summary
When seeing a failed test like
```bash
is_subtype_of.md - Subtype relation - Callable - Class literals - Classes with `__new_… (1e9782853227c019)
crates/ty_python_semantic/resources/mdtest/type_properties/is_subtype_of.md:1810 unexpected error: [unresolved-reference] "Name `Aa` used when not defined"
To rerun this specific test, set the environment variable: MDTEST_TEST_FILTER='is_subtype_of.md - Subtype relation - Callable - Class literals - Classes with `__new_… (1e9782853227c019)'
MDTEST_TEST_FILTER='is_subtype_of.md - Subtype relation - Callable - Class literals - Classes with `__new_… (1e9782853227c019)' cargo test -p ty_python_semantic --test mdtest -- mdtest__type_properties_is_subtype_of
```
running the following now works
```bash
MDTEST_TEST_FILTER='is_subtype_of.md - Subtype relation - Callable - Class literals - Classes with `__new_… (1e9782853227c019)' cargo test -p ty_python_semantic --test mdtest -- mdtest__type_properties_is_subtype_of
```
## Test Plan
Do we have tests for the test runner? :)
This fixes our logic for binding a legacy typevar with its binding
context. (To recap, a legacy typevar starts out "unbound" when it is
first created, and each time it's used in a generic class or function,
we "bind" it with the corresponding `Definition`.)
We treat `typing.Self` the same as a legacy typevar, and so we apply
this binding logic to it too. Before, we were using the enclosing class
as its binding context. But that's not correct — it's the method where
`typing.Self` is used that binds the typevar. (Each invocation of the
method will find a new specialization of `Self` based on the specific
instance type containing the invoked method.)
This required plumbing through some additional state to the
`in_type_expression` method.
This also revealed that we weren't handling `Self`-typed instance
attributes correctly (but were coincidentally not getting the expected
false positive diagnostics).
## Summary
Disallow `typing.TypedDict` in type expressions.
Related reference: https://github.com/python/mypy/issues/11030
## Test Plan
New Markdown tests, checked ecosystem and conformance test impact.
## Summary
This PR updates the client settings handling to recognize unknown
options provided by the user and show a warning popup along with a
warning log message.
## Test Plan
Add E2E tests.
## Summary
This PR implements support for providing LSP client settings.
The complementary PR in the ty VS Code extension:
astral-sh/ty-vscode#106.
Notes for the previous iteration of this PR is in
https://github.com/astral-sh/ruff/pull/19614#issuecomment-3136477864
(click on "Details").
Specifically, this PR splits the client settings into 3 distinct groups.
Keep in mind that these groups are not visible to the user, they're
merely an implementation detail. The groups are:
1. `GlobalOptions` - these are the options that are global to the
language server and will be the same for all the workspaces that are
handled by the server
2. `WorkspaceOptions` - these are the options that are specific to a
workspace and will be applied only when running any logic for that
workspace
3. `InitializationOptions` - these are the options that can be specified
during initialization
The initialization options are a superset that contains both the global
and workspace options flattened into a 1-dimensional structure. This
means that the user can specify any and all fields present in
`GlobalOptions` and `WorkspaceOptions` in the initialization options in
addition to the fields that are _specific_ to initialization options.
From the current set of available settings, following are only available
during initialization because they are required at that time, are static
during the runtime of the server and changing their values require a
restart to take effect:
- `logLevel`
- `logFile`
And, following are available under `GlobalOptions`:
- `diagnosticMode`
And, following under `WorkspaceOptions`:
- `disableLanguageServices`
- `pythonExtension` (Python environment information that is populated by
the ty VS Code extension)
### `workspace/configuration`
This request allows server to ask the client for configuration to a
specific workspace. But, this is only supported by the client that has
the `workspace.configuration` client capability set to `true`. What to
do for clients that don't support pulling configurations?
In that case, the settings needs to be provided in the initialization
options and updating the values of those settings can only be done by
restarting the server. With the way this is implemented, this means that
if the client does not support pulling workspace configuration then
there's no way to specify settings specific to a workspace. Earlier,
this would've been possible by providing an array of client options with
an additional field which specifies which workspace the options belong
to but that adds complexity and clients that actually do not support
`workspace/configuration` would usually not support multiple workspaces
either.
Now, for the clients that do support this, the server will initiate the
request to get the configuration for all the workspaces at the start of
the server. Once the server receives these options, it will resolve them
for each workspace as follows:
1. Combine the client options sent during initialization with the
options specific to the workspace creating the final client options
that's specific to this workspace
2. Create a global options by combining the global options from (1) for
all workspaces which in turn will also combine the global options sent
during initialization
The global options are resolved into the global settings and are
available on the `Session` which is initialized with the default global
settings. The workspace options are resolved into the workspace settings
and are available on the respective `Workspace`.
The `SessionSnapshot` contains the global settings while the document
snapshot contains the workspace settings. We could add the global
settings to the document snapshot but that's currently not needed.
### Document diagnostic dynamic registration
Currently, the document diagnostic server capability is created based on
the `diagnosticMode` sent during initialization. But, that wouldn't
provide us with the complete picture. This means the server needs to
defer registering the document diagnostic capability at a later point
once the settings have been resolved.
This is done using dynamic registration for clients that support it. For
clients that do not support dynamic registration for document diagnostic
capability, the server advertises itself as always supporting workspace
diagnostics and work done progress token.
This dynamic registration now allows us to change the server capability
for workspace diagnostics based on the resolved `diagnosticMode` value.
In the future, once `workspace/didChangeConfiguration` is supported, we
can avoid the server restart when users have changed any client
settings.
## Test Plan
Add integration tests and recorded videos on the user experience in
various editors:
### VS Code
For VS Code users, the settings experience is unchanged because the
extension defines it's own interface on how the user can specify the
server setting. This means everything is under the `ty.*` namespace as
usual.
https://github.com/user-attachments/assets/c2e5ba5c-7617-406e-a09d-e397ce9c3b93
### Zed
For Zed, the settings experience has changed. Users can specify settings
during initialization:
```json
{
"lsp": {
"ty": {
"initialization_options": {
"logLevel": "debug",
"logFile": "~/.cache/ty.log",
"diagnosticMode": "workspace",
"disableLanguageServices": true
}
},
}
}
```
Or, can specify the options under the `settings` key:
```json
{
"lsp": {
"ty": {
"settings": {
"ty": {
"diagnosticMode": "openFilesOnly",
"disableLanguageServices": true
}
},
"initialization_options": {
"logLevel": "debug",
"logFile": "~/.cache/ty.log"
}
},
}
}
```
The `logLevel` and `logFile` setting still needs to go under the
initialization options because they're required by the server during
initialization.
We can remove the nesting of the settings under the "ty" namespace by
updating the return type of
db9ea0cdfd/src/tychecker.rs (L45-L49)
to be wrapped inside `ty` directly so that users can avoid doing the
double nesting.
There's one issue here which is that if the `diagnosticMode` is
specified in both the initialization option and settings key, then the
resolution is a bit different - if either of them is set to be
`workspace`, then it wins which means that in the following
configuration, the diagnostic mode is `workspace`:
```json
{
"lsp": {
"ty": {
"settings": {
"ty": {
"diagnosticMode": "openFilesOnly"
}
},
"initialization_options": {
"diagnosticMode": "workspace"
}
},
}
}
```
This behavior is mainly a result of combining global options from
various workspace configuration results. Users should not be able to
provide global options in multiple workspaces but that restriction
cannot be done on the server side. The ty VS Code extension restricts
these global settings to only be set in the user settings and not in
workspace settings but we do not control extensions in other editors.
https://github.com/user-attachments/assets/8e2d6c09-18e6-49e5-ab78-6cf942fe1255
### Neovim
Same as in Zed.
### Other
Other editors that do not support `workspace/configuration`, the users
would need to provide the server settings during initialization.
## Summary
This PR improves the `is_safe_mutable_class` function in `infer.rs` in
several ways:
- It uses `KnownClass::to_instance()` for all "safe mutable classes".
Previously, we were using `SpecialFormType::instance_fallback()` for
some variants -- I'm not totally sure why. Switching to
`KnownClass::to_instance()` for all "safe mutable classes" fixes a
number of TODOs in the `assignment.md` mdtest suite
- Rather than eagerly calling `.to_instance(db)` on all "safe mutable
classes" every time `is_safe_mutable_class` is called, we now only call
it lazily on each element, allowing us to short-circuit more
effectively.
- I removed the entry entirely for `TypedDict` from the list of "safe
mutable classes", as it's not correct.
`SpecialFormType::TypedDict.instance_fallback(db)` just returns an
instance type representing "any instance of `typing._SpecialForm`",
which I don't think was the intent of this code. No tests fail as a
result of removing this entry, as we already check separately whether an
object is an inhabitant of a `TypedDict` type (and consider that object
safe-mutable if so!).
## Test Plan
mdtests updated
## Summary
This PR adds type inference for key-based access on `TypedDict`s and a
new diagnostic for invalid subscript accesses:
```py
class Person(TypedDict):
name: str
age: int | None
alice = Person(name="Alice", age=25)
reveal_type(alice["name"]) # revealed: str
reveal_type(alice["age"]) # revealed: int | None
alice["naem"] # Unknown key "naem" - did you mean "name"?
```
## Test Plan
Updated Markdown tests
## Summary
This PR remaps ranges in Jupyter notebooks from simple `row:column`
indices in the concatenated source code to `cell:row:col` to match
Ruff's output. This is probably not a likely change to land upstream in
`annotate-snippets`, but I didn't see a good way around it.
The remapping logic is taken nearly verbatim from here:
cd6bf1457d/crates/ruff_linter/src/message/text.rs (L212-L222)
## Test Plan
New `full` rendering test for a notebook
I was mainly focused on Ruff, but in local tests this also works for ty:
```
error[invalid-assignment]: Object of type `Literal[1]` is not assignable to `str`
--> Untitled.ipynb:cell 1:3:1
|
1 | import math
2 |
3 | x: str = 1
| ^
|
info: rule `invalid-assignment` is enabled by default
error[invalid-assignment]: Object of type `Literal[1]` is not assignable to `str`
--> Untitled.ipynb:cell 2:3:1
|
1 | import math
2 |
3 | x: str = 1
| ^
|
info: rule `invalid-assignment` is enabled by default
```
This isn't a duplicate diagnostic, just an unimaginative example:
```py
# cell 1
import math
x: str = 1
# cell 2
import math
x: str = 1
```
Summary
--
This is the other commit I wanted to spin off from #19415, currently
stacked on #19644.
This PR suppresses blank snippets for empty ranges at the very beginning
of a file, and for empty ranges in non-existent files. Ruff includes
empty ranges for IO errors, for example.
f4e93b6335/crates/ruff_linter/src/message/text.rs (L100-L110)
The diagnostics now look like this (new snapshot test):
```
error[test-diagnostic]: main diagnostic message
--> example.py:1:1
```
Instead of [^*]
```
error[test-diagnostic]: main diagnostic message
--> example.py:1:1
|
|
```
Test Plan
--
A new `ruff_db` test showing the expected output format
[^*]: This doesn't correspond precisely to the example in the PR because
of some details of the diagnostic builder helper methods in `ruff_db`,
but you can see another example in the current version of the summary in
#19415.
Summary
--
Fixes a snapshot test failure I saw in #19653 locally and in Windows CI
by
padding the hex ID to 16 digits to match the regex in
`filter_result_id`.
78e5fe0a51/crates/ty_server/tests/e2e/pull_diagnostics.rs (L380-L384)
Test Plan
--
I applied this to the branch from #19653 locally and saw that the tests
now
pass. I couldn't reproduce this failure directly on `main` or this
branch,
though.
## Summary
This PR is a spin-off from https://github.com/astral-sh/ruff/pull/19415.
It enables replacing the severity and lint name in a ty-style
diagnostic:
```
error[unused-import]: `os` imported but unused
```
with the noqa code and optional fix availability icon for a Ruff
diagnostic:
```
F401 [*] `os` imported but unused
F821 Undefined name `a`
```
or nothing at all for a Ruff syntax error:
```
SyntaxError: Expected one or more symbol names after import
```
Ruff adds the `SyntaxError` prefix to these messages manually.
Initially (d912458), I just passed a `hide_severity` flag through a
bunch of calls to get it into `annotate-snippets`, but after looking at
it again today, I think reusing the `None` severity/level gave a nicer
result. As I note in a lengthy code comment, I think all of this code
should be temporary and reverted when Ruff gets real severities, so
hopefully it's okay if it feels a little hacky.
I think the main visible downside of this approach is that we can't
style the asterisk in the fix availabilty icon in cyan, as in Ruff's
current output. It's part of the message in this PR and any styling gets
overwritten in `annotate-snippets`.
<img width="400" height="342" alt="image"
src="https://github.com/user-attachments/assets/57542ec9-a81c-4a01-91c7-bd6d7ec99f99"
/>
Hmm, I guess reusing `Level::None` also means the `F401` isn't red
anymore. Maybe my initial approach was better after all. In any case,
the rest of the PR should be basically the same, it just depends how we
want to toggle the severity.
## Test Plan
New `ruff_db` tests. These snapshots should be compared to the two tests
just above them (`hide_severity_output` vs `output` and
`hide_severity_syntax_errors` against `syntax_errors`).
## Summary
This PR fixes a few inaccuracies in attribute access on `TypedDict`s. It
also changes the return type of `type(person)` to `type[dict[str,
object]]` if `person: Person` is an inhabitant of a `TypedDict`
`Person`. We still use `type[Person]` as the *meta type* of Person,
however (see reasoning
[here](https://github.com/astral-sh/ruff/pull/19733#discussion_r2253297926)).
## Test Plan
Updated Markdown tests.
## Summary
This PR adds a new `Type::TypedDict` variant. Before this PR, we treated
`TypedDict`-based types as dynamic Todo-types, and I originally planned
to make this change a no-op. And we do in fact still treat that new
variant similar to a dynamic type when it comes to type properties such
as assignability and subtyping. But then I somehow tricked myself into
implementing some of the things correctly, so here we are. The two main
behavioral changes are: (1) we now also detect generic `TypedDict`s,
which removes a few false positives in the ecosystem, and (2) we now
support *attribute* access (not key-based indexing!) on these types,
i.e. we infer proper types for something like
`MyTypedDict.__required_keys__`. Nothing exciting yet, but gets the
infrastructure into place.
Note that with this PR, the type of (the type) `MyTypedDict` itself is
still represented as a `Type::ClassLiteral` or `Type::GenericAlias` (in
case `MyTypedDict` is generic). Only inhabitants of `MyTypedDict`
(instances of `dict` at runtime) are represented by `Type::TypedDict`.
We may want to revisit this decision in the future, if this turns out to
be too error-prone. Right now, we need to use `.is_typed_dict(db)` in
all the right places to distinguish between actual (generic) classes and
`TypedDict`s. But so far, it seemed unnecessary to add additional `Type`
variants for these as well.
part of https://github.com/astral-sh/ty/issues/154
## Ecosystem impact
The new diagnostics on `cloud-init` look like true positives to me.
## Test Plan
Updated and new Markdown tests
## Summary
This is a follow-up to #19321.
Narrowing constraints introduced in a class scope were not applied even
when they can be applied in lazy nested scopes. This PR fixes so that
they are now applied.
Conversely, there were cases where narrowing constraints were being
applied in places where they should not, so it is also fixed.
## Test Plan
Some TODOs in `narrow/conditionals/nested.md` are now work correctly.
## Summary
This is a follow-up to #19321.
If we try to access a class variable before it is defined, the variable
is looked up in the global scope, rather than in any enclosing scopes.
Closes https://github.com/astral-sh/ty/issues/875.
## Test Plan
New tests in `narrow/conditionals/nested.md`.
## Summary
This PR enhances the `BLE001` rule to correctly detect blind exception
handling in tuple exceptions. Previously, the rule only checked single
exception types, but Python allows catching multiple exceptions using
tuples like `except (Exception, ValueError):`.
## Test Plan
It fails the following (whereas the main branch does not):
```bash
cargo run -p ruff -- check somefile.py --no-cache --select=BLE001
```
```python
# somefile.py
try:
1/0
except (ValueError, Exception) as e:
print(e)
```
```
somefile.py:3:21: BLE001 Do not catch blind exception: `Exception`
|
1 | try:
2 | 1/0
3 | except (ValueError, Exception) as e:
| ^^^^^^^^^ BLE001
4 | print(e)
|
Found 1 error.
```
## Summary
Support `as` patterns in reachability analysis:
```py
from typing import assert_never
def f(subject: str | int):
match subject:
case int() as x:
pass
case str():
pass
case _:
assert_never(subject) # would previously emit an error
```
Note that we still don't support inferring correct types for the bound
name (`x`).
Closes https://github.com/astral-sh/ty/issues/928
## Test Plan
New Markdown tests
## Summary
This PR reduces the virality of some of the `Todo` types in
`infer_tuple_type_expression`. Rather than inferring `Todo`, we instead
infer `tuple[Todo, ...]`. This reflects the fact that whatever the
contents of the slice in a `tuple[]` type expression, we would always
infer some kind of tuple type as the result of the type expression. Any
tuple type should be assignable to `tuple[Todo, ...]`, so this shouldn't
introduce any new false positives; this can be seen in the ecosystem
report.
As a result of the change, we are now able to enforce in the signature
of `Type::infer_tuple_type_expression` that it returns an
`Option<TupleType<'db>>`, which is more strongly typed and expresses
clearly the invariant that a tuple type expression should always be
inferred as a `tuple` type. To enable this, it was necessary to refactor
several `TupleType` constructors in `tuple.rs` so that they return
`Option<TupleType>` rather than `Type`; this means that callers of these
constructor functions are now free to either propagate the
`Option<TupleType<'db>>` or convert it to a `Type<'db>`.
## Test Plan
Mdtests updated.
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