Commit Graph

212 Commits

Author SHA1 Message Date
Jack O'Connor 1b44d7e2a7
[ty] add `SyntheticTypedDictType` and implement `normalized` and `is_equivalent_to` (#21784) 2025-12-10 20:36:36 +00:00
Micha Reiser f7528bd325
[ty] Checking files without extension (#21867) 2025-12-10 16:47:41 +00:00
Micha Reiser 2dd412c89a
Update README to remove production warning (#21899) 2025-12-10 17:25:41 +01:00
Alex Waygood 0ccd84136a
[ty] Make Python-version subdiagnostics less verbose (#21849) 2025-12-08 15:58:23 +00:00
Aria Desires 45ac30a4d7
[ty] Teach `ty` the meaning of desperation (try ancestor `pyproject.toml`s as search-paths if module resolution fails) (#21745)
## Summary

This makes an importing file a required argument to module resolution,
and if the fast-path cached query fails to resolve the module, take the
slow-path uncached (could be cached if we want)
`desperately_resolve_module` which will walk up from the importing file
until it finds a `pyproject.toml` (arbitrary decision, we could try
every ancestor directory), at which point it takes one last desperate
attempt to use that directory as a search-path. We do not continue
walking up once we've found a `pyproject.toml` (arbitrary decision, we
could keep going up).

Running locally, this fixes every broken-for-workspace-reasons import in
pyx's workspace!

* Fixes https://github.com/astral-sh/ty/issues/1539
* Improves https://github.com/astral-sh/ty/issues/839

## Test Plan

The workspace tests see a huge improvement on most absolute imports.
2025-12-03 15:04:36 -05:00
Denys Zhak f4e4229683
Add token based `parenthesized_ranges` implementation (#21738)
Co-authored-by: Micha Reiser <micha@reiser.io>
2025-12-03 08:15:17 +00:00
Alex Waygood 392a8e4e50
[ty] Improve diagnostics for unsupported comparison operations (#21737) 2025-12-02 19:58:45 +00:00
Charlie Marsh 72304b01eb
[ty] Add a diagnostic for prohibited `NamedTuple` attribute overrides (#21717)
## Summary

Closes https://github.com/astral-sh/ty/issues/1684.
2025-12-01 21:46:58 -05:00
Charlie Marsh e7beb7e1f4
[ty] Forbid use of `super()` in `NamedTuple` subclasses (#21700)
## Summary

The exact behavior around what's allowed vs. disallowed was partly
detected through trial and error in the runtime.

I was a little confused by [this
comment](https://github.com/python/cpython/pull/129352) that says
"`NamedTuple` subclasses cannot be inherited from" because in practice
that doesn't appear to error at runtime.

Closes [#1683](https://github.com/astral-sh/ty/issues/1683).
2025-11-30 15:49:06 +00:00
Alex Waygood 8bcfc198b8
[ty] Implement `typing.final` for methods (#21646)
Co-authored-by: Micha Reiser <micha@reiser.io>
2025-11-28 15:18:02 +00:00
Alex Waygood aef2fad0c5
[ty] Add IDE autofixes for two "Did you mean...?" suggestions (#21667) 2025-11-27 18:20:02 +00:00
Alex Waygood 792ec3e96e
Improve docs on how to stop Ruff and ty disagreeing with each other (#21644)
## Summary

Lots of Ruff rules encourage you to make changes that might then cause
ty to start complaining about Liskov violations. Most of these Ruff
rules already refrain from complaining about a method if they see that
the method is decorated with `@override`, but this usually isn't
documented. This PR updates the docs of many Ruff rules to note that
they refrain from complaining about `@override`-decorated methods, and
also adds a similar note to the ty `invalid-method-override`
documentation.

Helps with
https://github.com/astral-sh/ty/issues/1644#issuecomment-3581663859

## Test Plan

- `uvx prek run -a` locally
- CI on this PR
2025-11-27 08:18:21 +00:00
Dhruv Manilawala c7107a5a90
[ty] Use `zip` to perform explicit specialization (#21635)
## Summary

This PR updates the explicit specialization logic to avoid using the
call machinery.

Previously, the logic would use the call machinery by converting the
list of type variables into a `Binding` with a single `Signature` where
all the type variables are positional-only parameters with bounds and
constraints as the annotated type and the default type as the default
parameter value. This has the advantage that it doesn't need to
implement any specific logic but the disadvantages are subpar diagnostic
messages as it would use the ones specific to a function call. But, an
important disadvantage is that the kind of type variable is lost in this
translation which becomes important in #21445 where a `ParamSpec` can
specialize into a list of types which is provided using list literal.
For example,

```py
class Foo[T, **P]: ...

Foo[int, [int, str]]
```

This PR converts the logic to use a simple loop using `zip_longest` as
all type variables and their corresponding type argument maps on a 1-1
basis. They cannot be specified using keyword argument either e.g.,
`dict[_VT=str, _KT=int]` is invalid.

This PR also makes an initial attempt to improve the diagnostic message
to specifically target the specialization part by using words like "type
argument" instead of just "argument" and including information like the
type variable, bounds, and constraints. Further improvements can be made
by highlighting the type variable definition or the bounds / constraints
as a sub-diagnostic but I'm going to leave that as a follow-up.

## Test Plan

Update messages in existing test cases.
2025-11-27 03:52:22 +00:00
Shunsuke Shibayama 2c0c5ff4e7
[ty] handle recursive type inference properly (#20566)
## Summary

Derived from #17371

Fixes astral-sh/ty#256
Fixes https://github.com/astral-sh/ty/issues/1415
Fixes https://github.com/astral-sh/ty/issues/1433
Fixes https://github.com/astral-sh/ty/issues/1524

Properly handles any kind of recursive inference and prevents panics.

---

Let me explain techniques for converging fixed-point iterations during
recursive type inference.
There are two types of type inference that naively don't converge
(causing salsa to panic): divergent type inference and oscillating type
inference.

### Divergent type inference

Divergent type inference occurs when eagerly expanding a recursive type.
A typical example is this:

```python
class C:
    def f(self, other: "C"):
        self.x = (other.x, 1)

reveal_type(C().x) # revealed: Unknown | tuple[Unknown | tuple[Unknown | tuple[..., Literal[1]], Literal[1]], Literal[1]]
```

To solve this problem, we have already introduced `Divergent` types
(https://github.com/astral-sh/ruff/pull/20312). `Divergent` types are
treated as a kind of dynamic type [^1].

```python
Unknown | tuple[Unknown | tuple[Unknown | tuple[..., Literal[1]], Literal[1]], Literal[1]]
=> Unknown | tuple[Divergent, Literal[1]]
```

When a query function that returns a type enters a cycle, it sets
`Divergent` as the cycle initial value (instead of `Never`). Then, in
the cycle recovery function, it reduces the nesting of types containing
`Divergent` to converge.

```python
0th: Divergent
1st: Unknown | tuple[Divergent, Literal[1]]
2nd: Unknown | tuple[Unknown | tuple[Divergent, Literal[1]], Literal[1]]
=> Unknown | tuple[Divergent, Literal[1]]
```

Each cycle recovery function for each query should operate only on the
`Divergent` type originating from that query.
For this reason, while `Divergent` appears the same as `Any` to the
user, it internally carries some information: the location where the
cycle occurred. Previously, we roughly identified this by having the
scope where the cycle occurred, but with the update to salsa, functions
that create cycle initial values ​​can now receive a `salsa::Id`
(https://github.com/salsa-rs/salsa/pull/1012). This is an opaque ID that
uniquely identifies the cycle head (the query that is the starting point
for the fixed-point iteration). `Divergent` now has this `salsa::Id`.

### Oscillating type inference

Now, another thing to consider is oscillating type inference.
Oscillating type inference arises from the fact that monotonicity is
broken. Monotonicity here means that for a query function, if it enters
a cycle, the calculation must start from a "bottom value" and progress
towards the final result with each cycle. Monotonicity breaks down in
type systems that have features like overloading and overriding.

```python
class Base:
    def flip(self) -> "Sub":
        return Sub()

class Sub(Base):
    def flip(self) -> "Base":
        return Base()

class C:
    def __init__(self, x: Sub):
        self.x = x

    def replace_with(self, other: "C"):
        self.x = other.x.flip()

reveal_type(C(Sub()).x)
```

Naive fixed-point iteration results in `Divergent -> Sub -> Base -> Sub
-> ...`, which oscillates forever without diverging or converging. To
address this, the salsa API has been modified so that the cycle recovery
function receives the value of the previous cycle
(https://github.com/salsa-rs/salsa/pull/1012).
The cycle recovery function returns the union type of the current cycle
and the previous cycle. In the above example, the result type for each
cycle is `Divergent -> Sub -> Base (= Sub | Base) -> Base`, which
converges.

The final result of oscillating type inference does not contain
`Divergent` because `Divergent` that appears in a union type can be
removed, as is clear from the expansion. This simplification is
performed at the same time as nesting reduction.

```
T | Divergent = T | (T | (T | ...)) = T
```

[^1]: In theory, it may be possible to strictly treat types containing
`Divergent` types as recursive types, but we probably shouldn't go that
deep yet. (AFAIK, there are no PEPs that specify how to handle
implicitly recursive types that aren't named by type aliases)

## Performance analysis

A happy side effect of this PR is that we've observed widespread
performance improvements!
This is likely due to the removal of the `ITERATIONS_BEFORE_FALLBACK`
and max-specialization depth trick
(https://github.com/astral-sh/ty/issues/1433,
https://github.com/astral-sh/ty/issues/1415), which means we reach a
fixed point much sooner.

## Ecosystem analysis

The changes look good overall.
You may notice changes in the converged values ​​for recursive types,
this is because the way recursive types are normalized has been changed.
Previously, types containing `Divergent` types were normalized by
replacing them with the `Divergent` type itself, but in this PR, types
with a nesting level of 2 or more that contain `Divergent` types are
normalized by replacing them with a type with a nesting level of 1. This
means that information about the non-divergent parts of recursive types
is no longer lost.

```python
# previous
tuple[tuple[Divergent, int], int] => Divergent
# now
tuple[tuple[Divergent, int], int] => tuple[Divergent, int]
```

The false positive error introduced in this PR occurs in class
definitions with self-referential base classes, such as the one below.

```python
from typing_extensions import Generic, TypeVar

T = TypeVar("T")
U = TypeVar("U")

class Base2(Generic[T, U]): ...

# TODO: no error
# error: [unsupported-base] "Unsupported class base with type `<class 'Base2[Sub2, U@Sub2]'> | <class 'Base2[Sub2[Unknown], U@Sub2]'>`"
class Sub2(Base2["Sub2", U]): ...
```

This is due to the lack of support for unions of MROs, or because cyclic
legacy generic types are not inferred as generic types early in the
query cycle.

## Test Plan

All samples listed in astral-sh/ty#256 are tested and passed without any
panic!

## Acknowledgments

Thanks to @MichaReiser for working on bug fixes and improvements to
salsa for this PR. @carljm also contributed early on to the discussion
of the query convergence mechanism proposed in this PR.

---------

Co-authored-by: Carl Meyer <carl@astral.sh>
2025-11-26 08:50:26 -08:00
Alex Waygood 81c97e9e94
[ty] Implement `typing.override` (#21627)
## Summary

Part of https://github.com/astral-sh/ty/issues/155. This implements the
basic check (`@override`-decorated methods should override things!), but
not the strict check specified in
https://typing.python.org/en/latest/spec/class-compat.html#strict-enforcement-per-project,
which should be a separate error code.

## Test Plan

mdtests and snapshots

---------

Co-authored-by: Carl Meyer <carl@astral.sh>
2025-11-25 10:42:40 -08:00
Micha Reiser 15cb41c1f9
[ty] Add 'remove unused ignore comment' code action (#21582)
## Summary

This PR adds a code action to remove unused ignore comments.

This PR also includes some infrastructure boilerplate to set up code
actions in the editor:

* Extend `snapshot-diagnostics` to render fixes
* Render fixes when using `--output-format=full`
* Hook up edits and the code action request in the LSP
* Add the `Unnecessary` tag to `unused-ignore-comment` diagnostics
* Group multiple unused codes into a single diagnostic

The same fix can be used on the CLI once we add `ty fix` 

Note: `unused-ignore-comment` is currently disabled by default.


https://github.com/user-attachments/assets/f9e21087-3513-4156-85d7-a90b1a7a3489
2025-11-25 08:08:21 -05:00
Micha Reiser eddb9ad38d
[ty] Refactor `CheckSuppressionContext` to use `DiagnosticGuard` (#21587) 2025-11-25 10:54:42 +00:00
Alex Waygood adf095e889
[ty] Extend Liskov checks to also cover classmethods and staticmethods (#21598)
## Summary

Building on https://github.com/astral-sh/ruff/pull/21436.

There's nothing conceptually more complicated about this, it just
requires its own set of tests and its own subdiagnostic hint.

I also uncovered another inconsistency between mypy/pyright/pyrefly,
which is fun. In this case, I suggest we go with pyright's behaviour.

## Test Plan

mdtests/snapshots
2025-11-24 23:14:06 +00:00
Alex Waygood a57e291311
[ty] Add hint about resolved Python version when a user attempts to import a member added on a newer version (#21615)
## Summary

Fixes https://github.com/astral-sh/ty/issues/1620. #20909 added hints if
you do something like this and your Python version is set to 3.10 or
lower:

```py
import typing

typing.LiteralString
```

And we also have hints if you try to do something like this and your
Python version is set too low:

```py
from stdlib_module import new_submodule
```

But we don't currently have any subdiagnostic hint if you do something
like _this_ and your Python version is set too low:

```py
from typing import LiteralString
```

This PR adds that hint!

## Test Plan

snapshots

---------

Co-authored-by: Aria Desires <aria.desires@gmail.com>
2025-11-24 15:12:01 +00:00
Alex Waygood e642874cf1
[ty] Check method definitions on subclasses for Liskov violations (#21436) 2025-11-23 18:08:15 +00:00
Micha Reiser 663f78e644
[ty] Exit with `2` if there's any IO error (#21508)
Co-authored-by: David Peter <mail@david-peter.de>
2025-11-19 09:39:19 +01:00
Alex Waygood 8dad289062
[ty] Add Salsa caching to `ClassLiteral::fields` (#21512) 2025-11-18 17:48:36 +00:00
David Peter 5ca9c15fc8
[ty] Better invalid-assignment diagnostics (#21476)
## Summary

Improve the diagnostic range for `invalid-assignment` diagnostics, and
add source annotations for the value and target type.

closes https://github.com/astral-sh/ty/issues/1556

### Before

<img width="836" height="601" alt="image"
src="https://github.com/user-attachments/assets/a48219bb-58a8-4a83-b290-d09ef50ce5f0"
/>

### After

<img width="857" height="742" alt="image"
src="https://github.com/user-attachments/assets/cfcaa4f4-94fb-459e-8d64-97050dfecb50"
/>

## Ecosystem impact

Very good! Due to the wider diagnostic range, we now pick up more `#
type: ignore` directives that were supposed to suppress an invalid
assignment diagnostic.

## Test Plan

New snapshot tests
2025-11-18 14:31:04 +01:00
Alex Waygood d63b4b0383
[ty] Improve diagnostic range for `non-subscriptable` diagnostics (#21461)
## Summary

Currently our diagnostic only covers the range of the thing being
subscripted:

<img width="1702" height="312" alt="image"
src="https://github.com/user-attachments/assets/7e630431-e846-46ca-93c1-139f11aaba11"
/>

But it should probably cover the _whole_ subscript expression (arguably
the more "incorrect" bit is the `["foo"]` part of this expression, not
the `x` part of this expression!)

## Test Plan

Added a snapshot

Co-authored-by: Brent Westbrook
<36778786+ntBre@users.noreply.github.com>
2025-11-14 21:15:14 +00:00
Aria Desires 3d4b0559f1
[ty] remove erroneous canonicalize (#21405)
Alternative implementation to
https://github.com/astral-sh/ruff/pull/21052
2025-11-12 15:47:33 -05:00
Jack O'Connor 5f3e086ee4 [ty] implement `typing.NewType` by adding `Type::NewTypeInstance` 2025-11-10 14:55:47 -08:00
Micha Reiser f44598dc11
[ty] Fix `--exclude` and `src.exclude` merging (#21341) 2025-11-10 12:52:45 +01:00
Hugo van Kemenade 09e6af16c8
[ruff+ty] Add colour to `--help` (#21337) 2025-11-08 17:17:14 +01:00
Dhruv Manilawala cb2e277482
[ty] Understand legacy and PEP 695 `ParamSpec` (#21139)
## Summary

This PR adds support for understanding the legacy definition and PEP 695
definition for `ParamSpec`.

This is still very initial and doesn't really implement any of the
semantics.

Part of https://github.com/astral-sh/ty/issues/157

## Test Plan

Add mdtest cases.

## Ecosystem analysis

Most of the diagnostics in `starlette` are due to the fact that ty now
understands `ParamSpec` is not a `Todo` type, so the assignability check
fails. The code looks something like:

```py
class _MiddlewareFactory(Protocol[P]):
    def __call__(self, app: ASGIApp, /, *args: P.args, **kwargs: P.kwargs) -> ASGIApp: ...  # pragma: no cover

class Middleware:
    def __init__(
        self,
        cls: _MiddlewareFactory[P],
        *args: P.args,
        **kwargs: P.kwargs,
    ) -> None:
        self.cls = cls
        self.args = args
        self.kwargs = kwargs

# ty complains that `ServerErrorMiddleware` is not assignable to `_MiddlewareFactory[P]`
Middleware(ServerErrorMiddleware, handler=error_handler, debug=debug)
```

There are multiple diagnostics where there's an attribute access on the
`Wrapped` object of `functools` which Pyright also raises:
```py
from functools import wraps

def my_decorator(f):
    @wraps(f)
    def wrapper(*args, **kwds):
        return f(*args, **kwds)

	# Pyright: Cannot access attribute "__signature__" for class "_Wrapped[..., Unknown, ..., Unknown]"
      Attribute "__signature__" is unknown [reportAttributeAccessIssue]
	# ty: Object of type `_Wrapped[Unknown, Unknown, Unknown, Unknown]` has no attribute `__signature__` [unresolved-attribute]
    wrapper.__signature__
    return wrapper
```

There are additional diagnostics that is due to the assignability checks
failing because ty now infers the `ParamSpec` instead of using the
`Todo` type which would always succeed. This results in a few
`no-matching-overload` diagnostics because the assignability checks
fail.

There are a few diagnostics related to
https://github.com/astral-sh/ty/issues/491 where there's a variable
which is either a bound method or a variable that's annotated with
`Callable` that doesn't contain the instance as the first parameter.

Another set of (valid) diagnostics are where the code hasn't provided
all the type variables. ty is now raising diagnostics for these because
we include `ParamSpec` type variable in the signature. For example,
`staticmethod[Any]` which contains two type variables.
2025-11-06 11:14:40 -05:00
Zanie Blue 132d10fb6f
[ty] Discover site-packages from the environment that ty is installed in (#21286)
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## Summary

<!-- What's the purpose of the change? What does it do, and why? -->

Closes https://github.com/astral-sh/ty/issues/989

There are various situations where users expect the Python packages
installed in the same environment as ty itself to be considered during
type checking. A minimal example would look like:

```
uv venv my-env
uv pip install my-env ty httpx
echo "import httpx" > foo.py
./my-env/bin/ty check foo.py
```

or

```
uv tool install ty --with httpx
echo "import httpx" > foo.py
ty check foo.py
```

While these are a bit contrived, there are real-world situations where a
user would expect a similar behavior to work. Notably, all of the other
type checkers consider their own environment when determining search
paths (though I'll admit that I have not verified when they choose not
to do this).

One common situation where users are encountering this today is with
`uvx --with-requirements script.py ty check script.py` — which is
currently our "best" recommendation for type checking a PEP 723 script,
but it doesn't work.

Of the options discussed in
https://github.com/astral-sh/ty/issues/989#issuecomment-3307417985, I've
chosen (2) as our criteria for including ty's environment in the search
paths.

- If no virtual environment is discovered, we will always include ty's
environment.
- If a `.venv` is discovered in the working directory, we will _prepend_
ty's environment to the search paths. The dependencies in ty's
environment (e.g., from `uvx --with`) will take precedence.
- If a virtual environment is active, e.g., `VIRTUAL_ENV` (i.e.,
including conda prefixes) is set, we will not include ty's environment.

The reason we need to special case the `.venv` case is that we both

1.  Recommend `uvx ty` today as a way to check your project
2. Want to enable `uvx --with <...> ty`

And I don't want (2) to break when you _happen_ to be in a project
(i.e., if we only included ty's environment when _no_ environment is
found) and don't want to remove support for (1).

I think long-term, I want to make `uvx <cmd>` layer the environment on
_top_ of the project environment (in uv), which would obviate the need
for this change when you're using uv. However, that change is breaking
and I think users will expect this behavior in contexts where they're
not using uv, so I think we should handle it in ty regardless.

I've opted not to include the environment if it's non-virtual (i.e., a
system environment) for now. It seems better to start by being more
restrictive. I left a comment in the code.

## Test Plan

I did some manual testing with the initial commit, then subsequently
added some unit tests.

```
❯ echo "import httpx" > example.py
❯ uvx --with httpx ty check example.py
Installed 8 packages in 19ms
error[unresolved-import]: Cannot resolve imported module `httpx`
 --> foo/example.py:1:8
  |
1 | import httpx
  |        ^^^^^
  |
info: Searched in the following paths during module resolution:
info:   1. /Users/zb/workspace/ty/python (first-party code)
info:   2. /Users/zb/workspace/ty (first-party code)
info:   3. vendored://stdlib (stdlib typeshed stubs vendored by ty)
info: make sure your Python environment is properly configured: https://docs.astral.sh/ty/modules/#python-environment
info: rule `unresolved-import` is enabled by default

Found 1 diagnostic
❯ uvx --from . --with httpx ty check example.py
All checks passed!
```

```
❯ uv init --script foo.py
Initialized script at `foo.py`
❯ uv add --script foo.py httpx
warning: The Python request from `.python-version` resolved to Python 3.13.8, which is incompatible with the script's Python requirement: `>=3.14`
Updated `foo.py`
❯ echo "import httpx" >> foo.py
❯ uvx --with-requirements foo.py ty check foo.py
error[unresolved-import]: Cannot resolve imported module `httpx`
  --> foo.py:15:8
   |
13 | if __name__ == "__main__":
14 |     main()
15 | import httpx
   |        ^^^^^
   |
info: Searched in the following paths during module resolution:
info:   1. /Users/zb/workspace/ty/python (first-party code)
info:   2. /Users/zb/workspace/ty (first-party code)
info:   3. vendored://stdlib (stdlib typeshed stubs vendored by ty)
info: make sure your Python environment is properly configured: https://docs.astral.sh/ty/modules/#python-environment
info: rule `unresolved-import` is enabled by default

Found 1 diagnostic
❯ uvx --from . --with-requirements foo.py ty check foo.py
All checks passed!
```

Notice we do not include ty's environment if `VIRTUAL_ENV` is set

```
❯ VIRTUAL_ENV=.venv uvx --with httpx ty check foo/example.py
error[unresolved-import]: Cannot resolve imported module `httpx`
 --> foo/example.py:1:8
  |
1 | import httpx
  |        ^^^^^
  |
info: Searched in the following paths during module resolution:
info:   1. /Users/zb/workspace/ty/python (first-party code)
info:   2. /Users/zb/workspace/ty (first-party code)
info:   3. vendored://stdlib (stdlib typeshed stubs vendored by ty)
info:   4. /Users/zb/workspace/ty/.venv/lib/python3.13/site-packages (site-packages)
info: make sure your Python environment is properly configured: https://docs.astral.sh/ty/modules/#python-environment
info: rule `unresolved-import` is enabled by default

Found 1 diagnostic
```
2025-11-06 09:27:49 -05:00
Micha Reiser 7569b09bdd
[ty] Add `ty_server::Db` trait (#21241) 2025-11-05 13:40:07 +00:00
Carl Meyer 3179b05221
[ty] don't assume in diagnostic messages that a TypedDict key error is about subscript access (#21166)
## Summary

Before this PR, we would emit diagnostics like "Invalid key access" for
a TypedDict literal with invalid key, which doesn't make sense since
there's no "access" in that case. This PR just adjusts the wording to be
more general, and adjusts the documentation of the lint rule too.

I noticed this in the playground and thought it would be a quick fix. As
usual, it turned out to be a bit more subtle than I expected, but for
now I chose to punt on the complexity. We may ultimately want to have
different rules for invalid subscript vs invalid TypedDict literal,
because an invalid key in a TypedDict literal is low severity: it's a
typo detector, but not actually a type error. But then there's another
wrinkle there: if the TypedDict is `closed=True`, then it _is_ a type
error. So would we want to separate the open and closed cases into
separate rules, too? I decided to leave this as a question for future.

If we wanted to use separate rules, or use specific wording for each
case instead of the generalized wording I chose here, that would also
involve a bit of extra work to distinguish the cases, since we use a
generic set of functions for reporting these errors.

## Test Plan

Added and updated mdtests.
2025-10-31 10:49:59 -04:00
Micha Reiser eb8c0ad87c
[ty] Add `--no-progress` option (#21063) 2025-10-24 18:00:00 +02:00
Micha Reiser f36fa7d6c1
[ty] Fix missing newline before first diagnostic (#21058) 2025-10-24 17:35:23 +02:00
Alex Waygood 1f8297cfe6
[ty] Improve error messages for unresolved attribute diagnostics (#20963)
## Summary

- Type checkers (and type-checker authors) think in terms of types, but
I think most Python users think in terms of values. Rather than saying
that a _type_ `X` "has no attribute `foo`" (which I think sounds strange
to many users), say that "an object of type `X` has no attribute `foo`"
- Special-case certain types so that the diagnostic messages read more
like normal English: rather than saying "Type `<class 'Foo'>` has no
attribute `bar`" or "Object of type `<class 'Foo'>` has no attribute
`bar`", just say "Class `Foo` has no attribute `bar`"

## Test Plan

Mdtests and snapshots updated
2025-10-19 10:58:25 +01:00
Micha Reiser 7532155c9b
[ty] Add suggestion to unknown rule diagnostics, rename `unknown-rule` lint to `ignore-comment-unknown-rule` (#20948) 2025-10-18 12:44:21 +02:00
Brent Westbrook e64d772788
Standardize syntax error construction (#20903)
Summary
--

This PR unifies the two different ways Ruff and ty construct syntax
errors. Ruff has been storing the primary message in the diagnostic
itself, while ty attached the message to the primary annotation:

```
> ruff check try.py
invalid-syntax: name capture `x` makes remaining patterns unreachable
 --> try.py:2:10
  |
1 | match 42:
2 |     case x: ...
  |          ^
3 |     case y: ...
  |

Found 1 error.
> uvx ty check try.py
WARN ty is pre-release software and not ready for production use. Expect to encounter bugs, missing features, and fatal errors.
Checking ------------------------------------------------------------ 1/1 files                                                                                                 
error[invalid-syntax]
 --> try.py:2:10
  |
1 | match 42:
2 |     case x: ...
  |          ^ name capture `x` makes remaining patterns unreachable
3 |     case y: ...
  |

Found 1 diagnostic
```

I think there are benefits to both approaches, and I do like ty's
version, but I feel like we should pick one (and it might help with
#20901 eventually). I slightly prefer Ruff's version, so I went with
that. Hopefully this isn't too controversial, but I'm happy to close
this if it is.

Note that this shouldn't change any other diagnostic formats in ty
because
[`Diagnostic::primary_message`](98d27c4128/crates/ruff_db/src/diagnostic/mod.rs (L177))
was already falling back to the primary annotation message if the
diagnostic message was empty. As a result, I think this change will
partially resolve the FIXME therein.

Test Plan
--

Existing tests with updated snapshots
2025-10-16 11:56:32 -04:00
Aria Desires 7155a62e5c
[ty] Add version hint for failed stdlib attribute accesses (#20909)
This is the ultra-minimal implementation of

* https://github.com/astral-sh/ty/issues/296

that was previously discussed as a good starting point. In particular we
don't actually bother trying to figure out the exact python versions,
but we still mention "hey btw for No Reason At All... you're on python
3.10" when you try to access something that has a definition rooted in
the stdlib that we believe exists sometimes.
2025-10-16 14:07:33 +00:00
Micha Reiser 9393279f65
[ty] Limit shown import paths to at most 5 unless ty runs with `-v` (#20912) 2025-10-16 13:18:09 +02:00
Micha Reiser 441ba20876
[ty] Document when a rule was added (#20859) 2025-10-14 14:33:48 +02:00
Micha Reiser 373fe8a39c
[ty] Remove 'pre-release software' warning (#20817) 2025-10-13 19:50:19 +02:00
David Peter 1f1542db51
[ty] Use 3.14 as the default version (#20759)
## Summary

Bump the latest supported Python version of ty to 3.14 and updates some
references from 3.13 to 3.14.

This also fixes a bug with `dataclasses.field` on 3.14 (which adds a new
keyword-only parameter to that function, breaking our previously naive
matching on the parameter structure of that function).

## Test Plan

A `ty check` on a file with template strings (without any further
configuration) doesn't raise errors anymore.
2025-10-08 11:38:47 +02:00
Alex Waygood ff386b4797
[ty] Improve diagnostics for bad `@overload` definitions (#20745) 2025-10-07 21:52:57 +00:00
Brent Westbrook 88c0ce3e38
Update default and latest Python versions for 3.14 (#20725)
Summary
--

Closes #19467 and also removes the warning about using Python 3.14
without
preview enabled.

I also bumped `PythonVersion::default` to 3.9 because it reaches EOL
this month,
but we could also defer that for now if we wanted.

The first three commits are related to the `latest` bump to 3.14; the
fourth commit
bumps the default to 3.10.

Note that this PR also bumps the default Python version for ty to 3.10
because
there was a test asserting that it stays in sync with
`ast::PythonVersion`.

Test Plan
--

Existing tests

I spot-checked the ecosystem report, and I believe these are all
expected. Inbits doesn't specify a target Python version, so I guess
we're applying the default. UP007, UP035, and UP045 all use the new
default value to emit new diagnostics.
2025-10-07 12:23:11 -04:00
Alex Waygood 42b297bf44
[ty] Improve documentation for `extra-paths` and `python` config settings (#20717)
Co-authored-by: Micha Reiser <micha@reiser.io>
2025-10-06 12:20:00 +00:00
Alex Waygood 80b337669f
[ty] Add `--venv` as an alias to `--python` (#20718) 2025-10-06 13:03:05 +01:00
Daniel Kongsgaard f73ead11cb
[ty] improve base conda distinction from child conda (#20675)
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## Summary

#19990 didn't completely fix the base vs. child conda environment
distinction, since it detected slightly different behavior than what I
usually see in conda. E.g., I see something like the following:
```
(didn't yet activate conda, but base is active)
➜ printenv | grep CONDA
CONDA_PYTHON_EXE=/opt/anaconda3/bin/python
CONDA_PREFIX=/opt/anaconda3
CONDA_DEFAULT_ENV=base
CONDA_EXE=/opt/anaconda3/bin/conda
CONDA_SHLVL=1
CONDA_PROMPT_MODIFIER=(base)

(activating conda)
➜ conda activate test

(test is an active conda environment)
❯ printenv | grep CONDA
CONDA_PREFIX=/opt/anaconda3/envs/test
CONDA_PYTHON_EXE=/opt/anaconda3/bin/python
CONDA_SHLVL=2
CONDA_PREFIX_1=/opt/anaconda3
CONDA_DEFAULT_ENV=test
CONDA_PROMPT_MODIFIER=(test)
CONDA_EXE=/opt/anaconda3/bin/conda
```

But the current behavior looks for `CONDA_DEFAULT_ENV =
basename(CONDA_PREFIX)` for the base environment instead of the child
environment, where we actually see this equality.

This pull request fixes that and updates the tests correspondingly.

## Test Plan

I updated the existing tests with the new behavior. Let me know if you
want more tests. Note: It shouldn't be necessary to test for the case
where we have `conda/envs/base`, since one should not be able to create
such an environment (one with the name of `CONDA_DEFAULT_ENV`).

---------

Co-authored-by: Aria Desires <aria.desires@gmail.com>
2025-10-03 13:56:06 +00:00
Alex Waygood 8664842d00
[ty] Ensure first-party search paths always appear in a sensible order (#20629)
This PR ensures that we always put `./src` before `.` in our list of
first-party search paths. This better emulates the fact that at runtime,
the module name of a file `src/foo.py` would almost certainly be `foo`
rather than `src.foo`.

I wondered if fixing this might fix
https://github.com/astral-sh/ruff/pull/20603#issuecomment-3345317444. It
seems like that's not the case, but it also seems like it leads to
better diagnostics because we report much more intuitive module names to
the user in our error messages -- so, it's probably a good change
anyway.
2025-09-29 21:19:13 +01:00
Micha Reiser c256c7943c
[ty] Update salsa to fix hang when cycle head panics (#20577) 2025-09-25 17:13:07 +02:00
Brent Westbrook 73b4b1ed17
[ty] Make `FileResolver::path` return a full path (#20550)
## Summary

Fixes https://github.com/astral-sh/ty/issues/1242

From finding references with the LSP, `FileResolver::path` is only
called once, in `UnifiedFile::path`, so I went through those references,
and it looked safe to make this change in every case. Most of the
references are in the various output formats, where we inherited the
absolute vs relative path decision from Ruff. Two other uses are as
fallbacks if converting a relativized path to a string fails. Finally,
we use the path for sorting and in `UnifiedFile::relative_path`.

## Test Plan

Existing tests, with snapshots updated to show absolute paths (in the
`TestDb` this just added a `/` in front of the file names). I also
updated the GitLab CLI test to set the `CI_PROJECT_DIR` environment
variable and ran a test in GitLab CI:

<img width="613" height="114" alt="image"
src="https://github.com/user-attachments/assets/8ab81dba-54fd-4a24-9110-77ef89293cff"
/>
2025-09-24 13:16:51 -04:00