ruff/crates/ruff_python_ast/src
Robsdedude 6802c4702f
[`flake8-pyi`] Expand `Optional[A]` to `A | None` (`PYI016`) (#18572)
## Summary
Under preview 🧪 I've expanded rule `PYI016` to also flag type
union duplicates containing `None` and `Optional`.

## Test Plan
Examples/tests have been added. I've made sure that the existing
examples did not change unless preview is enabled.

## Relevant Issues
* https://github.com/astral-sh/ruff/issues/18508 (discussing
introducing/extending a rule to flag `Optional[None]`)
* https://github.com/astral-sh/ruff/issues/18546 (where I discussed this
addition with @AlexWaygood)

---------

Co-authored-by: Brent Westbrook <36778786+ntBre@users.noreply.github.com>
Co-authored-by: Brent Westbrook <brentrwestbrook@gmail.com>
2025-06-27 15:43:11 +00:00
..
visitor [ty] AST garbage collection (#18482) 2025-06-13 08:40:11 -04:00
comparable.rs [ty] AST garbage collection (#18482) 2025-06-13 08:40:11 -04:00
docstrings.rs Move Python whitespace utilities into new `ruff_python_whitespace` crate (#4993) 2023-06-10 00:59:57 +00:00
expression.rs Implement template strings (#17851) 2025-05-30 15:00:56 -05:00
generated.rs [ty] Add environment variable to dump Salsa memory usage stats (#18928) 2025-06-26 21:27:51 +00:00
helpers.rs [ty] AST garbage collection (#18482) 2025-06-13 08:40:11 -04:00
identifier.rs Switch to Rust 2024 edition (#18129) 2025-05-16 13:25:28 +02:00
int.rs [ty] Add environment variable to dump Salsa memory usage stats (#18928) 2025-06-26 21:27:51 +00:00
lib.rs [ty] AST garbage collection (#18482) 2025-06-13 08:40:11 -04:00
name.rs [ty] Add environment variable to dump Salsa memory usage stats (#18928) 2025-06-26 21:27:51 +00:00
node.rs [ty] AST garbage collection (#18482) 2025-06-13 08:40:11 -04:00
node_index.rs [`flake8-pyi`] Expand `Optional[A]` to `A | None` (`PYI016`) (#18572) 2025-06-27 15:43:11 +00:00
nodes.rs [ty] Add environment variable to dump Salsa memory usage stats (#18928) 2025-06-26 21:27:51 +00:00
operator_precedence.rs Implement template strings (#17851) 2025-05-30 15:00:56 -05:00
parenthesize.rs Remove customizable reference enum names (#15647) 2025-01-21 13:46:31 -05:00
python_version.rs [ty] Add environment variable to dump Salsa memory usage stats (#18928) 2025-06-26 21:27:51 +00:00
relocate.rs [ty] AST garbage collection (#18482) 2025-06-13 08:40:11 -04:00
script.rs bump MSRV to 1.83 (#16294) 2025-02-26 06:12:43 -08:00
statement_visitor.rs Remove `Stmt::TryStar` (#6566) 2023-08-14 13:39:44 -04:00
stmt_if.rs Misc. small tweaks from perusing modules (#9383) 2024-01-03 12:30:25 -05:00
str.rs Implement template strings (#17851) 2025-05-30 15:00:56 -05:00
str_prefix.rs Implement template strings (#17851) 2025-05-30 15:00:56 -05:00
traversal.rs Use referencial equality in `traversal` helper methods (#13895) 2024-10-24 11:30:22 +02:00
types.rs Remove `RefEquality` (#6393) 2023-08-07 16:04:50 +00:00
visitor.rs [ty] AST garbage collection (#18482) 2025-06-13 08:40:11 -04:00
whitespace.rs Switch to Rust 2024 edition (#18129) 2025-05-16 13:25:28 +02:00