Use TypeAlias where possible for type aliases (#7630)

stubs/SQLAlchemy/sqlalchemy/dbapi.pyi

@@ -3,11 +3,12 @@
 
 from collections.abc import Mapping, Sequence
 from typing import Any, Protocol
+from typing_extensions import TypeAlias
 
-DBAPITypeCode = Any | None
+DBAPITypeCode: TypeAlias = Any | None
 # Strictly speaking, this should be a Sequence, but the type system does
 # not support fixed-length sequences.
-DBAPIColumnDescription = tuple[str, DBAPITypeCode, int | None, int | None, int | None, int | None, bool | None]
+DBAPIColumnDescription: TypeAlias = tuple[str, DBAPITypeCode, int | None, int | None, int | None, int | None, bool | None]
 
 class DBAPIConnection(Protocol):
     def close(self) -> object: ...

stubs/SQLAlchemy/sqlalchemy/engine/base.pyi

@@ -3,6 +3,7 @@ from abc import abstractmethod
 from collections.abc import Mapping
 from types import TracebackType
 from typing import Any, Callable, TypeVar, overload
+from typing_extensions import TypeAlias
 
 from ..dbapi import DBAPIConnection
 from ..log import Identified, _EchoFlag, echo_property
@@ -19,7 +20,7 @@ from .util import TransactionalContext
 
 _T = TypeVar("_T")
 
-_Executable = ClauseElement | FunctionElement | DDLElement | DefaultGenerator | Compiled
+_Executable: TypeAlias = ClauseElement | FunctionElement | DDLElement | DefaultGenerator | Compiled
 
 class Connection(Connectable):
     engine: Engine

stubs/SQLAlchemy/sqlalchemy/engine/url.pyi

@@ -1,6 +1,7 @@
 from _typeshed import Self, SupportsItems
 from collections.abc import Iterable, Mapping, Sequence
 from typing import Any, NamedTuple
+from typing_extensions import TypeAlias
 
 from ..util import immutabledict
 from .interfaces import Dialect
@@ -15,7 +16,7 @@ class _URLTuple(NamedTuple):
     database: str | None
     query: immutabledict[str, str | tuple[str, ...]]
 
-_Query = Mapping[str, str | Sequence[str]] | Sequence[tuple[str, str | Sequence[str]]]
+_Query: TypeAlias = Mapping[str, str | Sequence[str]] | Sequence[tuple[str, str | Sequence[str]]]
 
 class URL(_URLTuple):
     @classmethod

stubs/SQLAlchemy/sqlalchemy/log.pyi

@@ -1,10 +1,10 @@
 from _typeshed import Self
 from logging import Logger
 from typing import Any, TypeVar, overload
-from typing_extensions import Literal
+from typing_extensions import Literal, TypeAlias
 
 _ClsT = TypeVar("_ClsT", bound=type)
-_EchoFlag = bool | Literal["debug"] | None
+_EchoFlag: TypeAlias = bool | Literal["debug"] | None
 
 rootlogger: Any
 

stubs/SQLAlchemy/sqlalchemy/orm/decl_api.pyi

@@ -1,5 +1,6 @@
 from collections.abc import Callable
 from typing import Any, ClassVar, TypeVar, overload
+from typing_extensions import TypeAlias
 
 from ..engine.interfaces import Connectable
 from ..sql.schema import MetaData
@@ -21,7 +22,7 @@ class _DeclarativeBase(Any):  # super classes are dynamic
     __class_getitem__: ClassVar[Any]
 
 # Meta class (or function) that creates a _DeclarativeBase class.
-_DeclarativeBaseMeta = Callable[[str, tuple[type[Any], ...], dict[str, Any]], _DeclT]
+_DeclarativeBaseMeta: TypeAlias = Callable[[str, tuple[type[Any], ...], dict[str, Any]], _DeclT]
 
 def has_inherited_table(cls: type[Any]) -> bool: ...
 

stubs/SQLAlchemy/sqlalchemy/util/_collections.pyi

@@ -3,6 +3,7 @@ import sys
 from _typeshed import Self, SupportsKeysAndGetItem
 from collections.abc import Callable, Iterable, Iterator, Mapping
 from typing import Any, Generic, NoReturn, TypeVar, overload
+from typing_extensions import TypeAlias
 
 from ..cimmutabledict import immutabledict as immutabledict
 from ..sql.elements import ColumnElement
@@ -178,7 +179,7 @@ class WeakPopulateDict(dict[Any, Any]):
 
 column_set = set
 column_dict = dict
-ordered_column_set = OrderedSet[ColumnElement[Any]]
+ordered_column_set: TypeAlias = OrderedSet[ColumnElement[Any]]
 
 def unique_list(seq: Iterable[_T], hashfunc: Callable[[_T], Any] | None = ...) -> list[_T]: ...