David Peter 4887bdf205 [ty] Infer types for key-based access on TypedDicts (#19763) ...

## 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

2025-08-06 09:36:33 +02:00

..

conditionals

[ty] fix incorrect lazy scope narrowing (#19744)

2025-08-04 20:32:08 -07:00

assert.md

Rename Red Knot (#17820)

2025-05-03 19:49:15 +02:00

assignment.md

[ty] Infer types for key-based access on TypedDicts (#19763)

2025-08-06 09:36:33 +02:00

bool-call.md

Rename Red Knot (#17820)

2025-05-03 19:49:15 +02:00

boolean.md

Rename Red Knot (#17820)

2025-05-03 19:49:15 +02:00

complex_target.md

[ty] Track different uses of legacy typevars, including context when rendering typevars (#19604)

2025-08-01 12:20:32 -04:00

hasattr.md

[ty] Attribute access on intersections with negative parts (#19524)

2025-07-25 14:56:14 +02:00

isinstance.md

[ty] Support narrowing on isinstance()/issubclass() if the second argument is a dynamic, intersection, union or typevar type (#18900)

2025-06-24 10:55:26 +00:00

issubclass.md

[ty] Support narrowing on isinstance()/issubclass() if the second argument is a dynamic, intersection, union or typevar type (#18900)

2025-06-24 10:55:26 +00:00

match.md

[ty] Improve disjointness inference for NominalInstanceTypes and SubclassOfTypes (#18864)

2025-06-24 20:27:37 +00:00

post_if_statement.md

Rename Red Knot (#17820)

2025-05-03 19:49:15 +02:00

truthiness.md

[ty] Reachability constraints (#18621)

2025-06-17 09:24:28 +02:00

type_guards.md

[ty] Splat variadic arguments into parameter list (#18996)

2025-07-22 14:33:08 -04:00

type.md

[ty] Surface matched overload diagnostic directly (#18452)

2025-06-20 08:36:49 +05:30

while.md

[ty] Eagerly simplify 'True' and 'False' constraints (#18998)

2025-06-30 13:11:52 +02:00