openpyxl: type to_tree methods (#10967)

stubs/openpyxl/@tests/stubtest_allowlist.txt

@@ -111,6 +111,7 @@ openpyxl.drawing.text.PresetTextShape.__init__
 openpyxl.drawing.text.TextField.__init__
 openpyxl.drawing.text.TextNormalAutofit.__init__
 openpyxl.formatting.rule.DataBar.__init__
+openpyxl.packaging.core.QualifiedDateTime.to_tree
 openpyxl.packaging.relationship.get_rel
 openpyxl.packaging.relationship.Relationship.__init__
 openpyxl.packaging.workbook.ChildSheet.__init__

stubs/openpyxl/openpyxl/chart/_chart.pyi

@@ -8,6 +8,7 @@ from openpyxl.chart.shapes import GraphicalProperties
 from openpyxl.chart.title import TitleDescriptor
 from openpyxl.descriptors.base import Alias, Bool, Integer, MinMax, Set, Typed
 from openpyxl.descriptors.serialisable import Serialisable
+from openpyxl.xml.functions import Element
 
 _ChartBaseDisplayBlanks: TypeAlias = Literal["span", "gap", "zero"]
 
@@ -41,7 +42,8 @@ class ChartBase(Serialisable):
     def __init__(self, axId=(), **kw: Unused) -> None: ...
     def __hash__(self) -> int: ...
     def __iadd__(self, other): ...
-    def to_tree(self, namespace: str | None = None, tagname: str | None = None, idx: Incomplete | None = None): ...  # type: ignore[override]
+    # namespace is in the wrong order to respect the override. This is an issue in openpyxl itself
+    def to_tree(self, namespace: Unused = None, tagname: str | None = None, idx: Unused = None) -> Element: ...  # type: ignore[override]
     def set_categories(self, labels) -> None: ...
     def add_data(self, data, from_rows: bool = False, titles_from_data: bool = False) -> None: ...
     def append(self, value) -> None: ...

stubs/openpyxl/openpyxl/chart/chartspace.pyi

@@ -15,6 +15,7 @@ from openpyxl.descriptors.excel import ExtensionList
 from openpyxl.descriptors.nested import NestedBool, NestedMinMax, NestedNoneSet, NestedString, _NestedNoneSetParam
 from openpyxl.descriptors.serialisable import Serialisable
 from openpyxl.drawing.colors import ColorMapping
+from openpyxl.xml.functions import Element
 
 from ..xml._functions_overloads import _HasTagAndGet
 
@@ -140,4 +141,4 @@ class ChartSpace(Serialisable):
         userShapes: Incomplete | None = None,
         extLst: Unused = None,
     ) -> None: ...
-    def to_tree(self, tagname: Incomplete | None = None, idx: Incomplete | None = None, namespace: str | None = None): ...
+    def to_tree(self, tagname: Unused = None, idx: Unused = None, namespace: Unused = None) -> Element: ...

stubs/openpyxl/openpyxl/chart/plotarea.pyi

@@ -9,6 +9,7 @@ from openpyxl.descriptors.base import Alias, Typed, _ConvertibleToBool
 from openpyxl.descriptors.excel import ExtensionList
 from openpyxl.descriptors.nested import NestedBool
 from openpyxl.descriptors.serialisable import Serialisable, _ChildSerialisableTreeElement
+from openpyxl.xml.functions import Element
 
 from ..xml._functions_overloads import _HasTagAndGet
 
@@ -71,6 +72,6 @@ class PlotArea(Serialisable):
         _axes=(),
         extLst: Unused = None,
     ) -> None: ...
-    def to_tree(self, tagname: str | None = None, idx: Incomplete | None = None, namespace: str | None = None): ...
+    def to_tree(self, tagname: str | None = None, idx: Unused = None, namespace: Unused = None) -> Element: ...
     @classmethod
     def from_tree(cls, node: _ChildSerialisableTreeElement) -> Self: ...

stubs/openpyxl/openpyxl/chart/series.pyi

@@ -13,6 +13,7 @@ from openpyxl.descriptors.base import Alias, Typed, _ConvertibleToBool
 from openpyxl.descriptors.excel import ExtensionList
 from openpyxl.descriptors.nested import NestedBool, NestedInteger, NestedNoneSet, NestedText, _NestedNoneSetParam
 from openpyxl.descriptors.serialisable import Serialisable
+from openpyxl.xml.functions import Element
 
 from ..xml._functions_overloads import _HasTagAndGet
 
@@ -82,7 +83,7 @@ class Series(Serialisable):
         explosion: _HasTagAndGet[ConvertibleToInt | None] | ConvertibleToInt | None = None,
         extLst: Unused = None,
     ) -> None: ...
-    def to_tree(self, tagname: str | None = None, idx: Incomplete | None = None): ...  # type: ignore[override]
+    def to_tree(self, tagname: str | None = None, idx: _HasTagAndGet[ConvertibleToInt] | ConvertibleToInt | None = None) -> Element: ...  # type: ignore[override]
 
 class XYSeries(Series):
     # Same as parent

stubs/openpyxl/openpyxl/chart/text.pyi

@@ -1,4 +1,4 @@
-from _typeshed import Incomplete
+from _typeshed import Incomplete, Unused
 from typing import ClassVar
 from typing_extensions import Literal
 
@@ -6,6 +6,7 @@ from openpyxl.chart.data_source import StrRef
 from openpyxl.descriptors.base import Alias, Typed
 from openpyxl.descriptors.serialisable import Serialisable
 from openpyxl.drawing.text import ListStyle, RichTextProperties
+from openpyxl.xml.functions import Element
 
 class RichText(Serialisable):
     tagname: ClassVar[str]
@@ -25,4 +26,4 @@ class Text(Serialisable):
     rich: Typed[RichText, Literal[True]]
     __elements__: ClassVar[tuple[str, ...]]
     def __init__(self, strRef: StrRef | None = None, rich: RichText | None = None) -> None: ...
-    def to_tree(self, tagname: str | None = None, idx: Incomplete | None = None, namespace: str | None = None): ...
+    def to_tree(self, tagname: str | None = None, idx: Unused = None, namespace: str | None = None) -> Element: ...

stubs/openpyxl/openpyxl/chartsheet/chartsheet.pyi

@@ -16,6 +16,7 @@ from openpyxl.workbook.child import _WorkbookChild
 from openpyxl.worksheet.drawing import Drawing
 from openpyxl.worksheet.header_footer import HeaderFooter as _HeaderFooter
 from openpyxl.worksheet.page import PageMargins, PrintPageSetup
+from openpyxl.xml.functions import Element
 
 class Chartsheet(_WorkbookChild, Serialisable):
     tagname: ClassVar[str]
@@ -55,4 +56,4 @@ class Chartsheet(_WorkbookChild, Serialisable):
         sheet_state: _VisibilityType = "visible",
     ) -> None: ...
     def add_chart(self, chart) -> None: ...
-    def to_tree(self): ...
+    def to_tree(self) -> Element: ...  # type:ignore[override]

stubs/openpyxl/openpyxl/comments/comment_sheet.pyi

@@ -10,6 +10,7 @@ from openpyxl.descriptors.base import Bool, Integer, Set, String, Typed, _Conver
 from openpyxl.descriptors.excel import ExtensionList
 from openpyxl.descriptors.serialisable import Serialisable
 from openpyxl.worksheet.ole import ObjectAnchor
+from openpyxl.xml.functions import Element
 
 _PropertiesTextHAlign: TypeAlias = Literal["left", "center", "right", "justify", "distributed"]
 _PropertiesTextVAlign: TypeAlias = Literal["top", "center", "bottom", "justify", "distributed"]
@@ -112,7 +113,7 @@ class CommentSheet(Serialisable):
     mime_type: str
     __elements__: ClassVar[tuple[str, ...]]
     def __init__(self, authors: AuthorList, commentList: Incomplete | None = None, extLst: Unused = None) -> None: ...
-    def to_tree(self): ...
+    def to_tree(self) -> Element: ...  # type: ignore[override]
     @property
     def comments(self) -> Generator[tuple[str, Comment], None, None]: ...
     @classmethod

stubs/openpyxl/openpyxl/compat/strings.pyi

@@ -3,4 +3,4 @@ from typing_extensions import Final
 
 VER: Final[sys._version_info]
 
-def safe_string(value): ...
+def safe_string(value: object) -> str: ...

stubs/openpyxl/openpyxl/descriptors/namespace.pyi

@@ -1 +1,2 @@
-def namespaced(obj, tagname, namespace: str | None = None): ...
+# 'None' shouldn't be a valid tagname and namespaced should always return str
+def namespaced(obj: object, tagname: str, namespace: str | None = None) -> str: ...

stubs/openpyxl/openpyxl/descriptors/nested.pyi

@@ -1,4 +1,4 @@
-from _typeshed import ConvertibleToFloat, ConvertibleToInt, Incomplete, Unused
+from _typeshed import ConvertibleToFloat, ConvertibleToInt, Unused
 from collections.abc import Iterable
 from typing import Any, ClassVar, NoReturn, overload
 from typing_extensions import Literal, TypeAlias
@@ -36,7 +36,10 @@ class Nested(Descriptor[_T]):
     def __get__(self, instance: Serialisable | Strict, cls: type | None) -> _T: ...
     def __set__(self, instance: Serialisable | Strict, value: _HasTagAndGet[_T] | _T) -> None: ...
     def from_tree(self, node: _HasGet[_T]) -> _T: ...
-    def to_tree(self, tagname: str | None = None, value: Incomplete | None = None, namespace: str | None = None) -> Element: ...
+    @overload
+    def to_tree(self, tagname: Unused = None, value: None = None, namespace: Unused = None) -> None: ...  # type: ignore[overload-overlap]
+    @overload
+    def to_tree(self, tagname: str, value: object, namespace: str | None = None) -> Element: ...
 
 class NestedValue(Nested[_T], Convertible[_T, _N]):  # type: ignore[misc]
     @overload
@@ -151,7 +154,10 @@ class NestedText(NestedValue[_T, _N]):
     @overload
     def __set__(self: NestedText[_T, Literal[True]], instance: Serialisable | Strict, value: _T | int | Any | None) -> None: ...
     def from_tree(self, node: _HasText) -> str: ...  # type: ignore[override]
-    def to_tree(self, tagname: str | None = None, value: Incomplete | None = None, namespace: str | None = None) -> Element: ...
+    @overload
+    def to_tree(self, tagname: Unused = None, value: None = None, namespace: Unused = None) -> None: ...  # type: ignore[overload-overlap]
+    @overload
+    def to_tree(self, tagname: str, value: object, namespace: str | None = None) -> Element: ...
 
 class NestedFloat(NestedValue[float, _N], Float[_N]):  # type: ignore[misc]
     @overload
@@ -264,4 +270,9 @@ class EmptyTag(Nested[bool], Bool[_N]):  # type: ignore[misc]
     def __get__(self: EmptyTag[Literal[False]], instance: Serialisable | Strict, cls: type | None = None) -> bool: ...
     def __set__(self, instance: Serialisable | Strict, value: _HasTagAndGet[_ConvertibleToBool] | _ConvertibleToBool) -> None: ...
     def from_tree(self, node: Unused) -> Literal[True]: ...
-    def to_tree(self, tagname: str | None = None, value: Incomplete | None = None, namespace: str | None = None) -> Element: ...
+    @overload
+    def to_tree(  # type: ignore[overload-overlap]
+        self, tagname: Unused = None, value: None = None, namespace: Unused = None
+    ) -> None: ...
+    @overload
+    def to_tree(self, tagname: str, value: object, namespace: str | None = None) -> Element: ...

stubs/openpyxl/openpyxl/descriptors/sequence.pyi

@@ -1,11 +1,12 @@
 from _typeshed import Incomplete, Unused
-from collections.abc import Generator, Iterable
+from collections.abc import Generator, Iterable, Sized
 from typing import Any, Protocol, TypeVar
 from typing_extensions import Self
 
 from openpyxl.descriptors import Strict
 from openpyxl.descriptors.serialisable import Serialisable, _SerialisableTreeElement
 from openpyxl.xml._functions_overloads import _HasGet
+from openpyxl.xml.functions import Element
 
 from .base import Alias, Descriptor
 
@@ -15,6 +16,9 @@ class _SupportsFromTree(Protocol):
     @classmethod
     def from_tree(cls, node: _SerialisableTreeElement) -> Any: ...
 
+class _SupportsToTree(Protocol):
+    def to_tree(self) -> Element: ...
+
 class Sequence(Descriptor[Incomplete]):
     expected_type: type[Incomplete]
     seq_types: tuple[type, ...]
@@ -22,7 +26,9 @@ class Sequence(Descriptor[Incomplete]):
     unique: bool
     container: type
     def __set__(self, instance: Serialisable | Strict, seq) -> None: ...
-    def to_tree(self, tagname, obj, namespace: str | None = None) -> Generator[Incomplete, None, None]: ...
+    def to_tree(
+        self, tagname: str | None, obj: Iterable[object], namespace: str | None = None
+    ) -> Generator[Element, None, None]: ...
 
 class UniqueSequence(Sequence):
     seq_types: tuple[type, ...]
@@ -30,20 +36,28 @@ class UniqueSequence(Sequence):
 
 class ValueSequence(Sequence):
     attribute: str
-    def to_tree(self, tagname, obj, namespace: str | None = None) -> Generator[Incomplete, None, None]: ...
+    def to_tree(
+        self, tagname: str, obj: Iterable[object], namespace: str | None = None  # type: ignore[override]
+    ) -> Generator[Element, None, None]: ...
     def from_tree(self, node: _HasGet[_T]) -> _T: ...
 
+class _NestedSequenceToTreeObj(Sized, Iterable[_SupportsToTree], Protocol): ...
+
 class NestedSequence(Sequence):
     count: bool
     expected_type: type[_SupportsFromTree]
-    def to_tree(self, tagname, obj, namespace: str | None = None): ...
+    def to_tree(  # type: ignore[override]
+        self, tagname: str, obj: _NestedSequenceToTreeObj, namespace: str | None = None
+    ) -> Element: ...
     # returned list generic type should be same as the return type of expected_type.from_tree(node)
     # Which can really be anything given the wildly different, and sometimes generic, from_tree return types
     def from_tree(self, node: Iterable[_SerialisableTreeElement]) -> list[Any]: ...
 
 class MultiSequence(Sequence):
     def __set__(self, instance: Serialisable | Strict, seq) -> None: ...
-    def to_tree(self, tagname, obj, namespace: str | None = None) -> Generator[Incomplete, None, None]: ...
+    def to_tree(
+        self, tagname: Unused, obj: Iterable[_SupportsToTree], namespace: str | None = None  # type: ignore[override]
+    ) -> Generator[Element, None, None]: ...
 
 class MultiSequencePart(Alias):
     expected_type: type[Incomplete]

stubs/openpyxl/openpyxl/descriptors/serialisable.pyi

@@ -1,11 +1,12 @@
-from _typeshed import Incomplete, SupportsIter
+from _typeshed import ConvertibleToInt, Incomplete, SupportsIter
 from collections.abc import Iterator
 from typing import Any, ClassVar, Protocol
 from typing_extensions import Final, Self
 
 from openpyxl.descriptors import MetaSerialisable
+from openpyxl.xml.functions import Element
 
-from ..xml._functions_overloads import _HasAttrib, _HasGet, _HasText, _SupportsFindChartLines
+from ..xml._functions_overloads import _HasAttrib, _HasGet, _HasTagAndGet, _HasText, _SupportsFindChartLines
 
 # For any override directly re-using Serialisable.from_tree
 class _ChildSerialisableTreeElement(_HasAttrib, _HasText, SupportsIter[Incomplete], Protocol): ...
@@ -34,7 +35,14 @@ class Serialisable(metaclass=MetaSerialisable):
     # Use _ChildSerialisableTreeElement instead for child classes that reuse Serialisable.from_tree directly.
     @classmethod
     def from_tree(cls, node: _SerialisableTreeElement) -> Self | None: ...
-    def to_tree(self, tagname: str | None = None, idx: Incomplete | None = None, namespace: str | None = None): ...
+    # Note: To respect the Liskov substitution principle, idx is a type union of all child class requirements.
+    # Use Unused instead for child classes that reuse Serialisable.to_tree directly.
+    def to_tree(
+        self,
+        tagname: str | None = None,
+        idx: _HasTagAndGet[ConvertibleToInt] | ConvertibleToInt | None = None,
+        namespace: str | None = None,
+    ) -> Element: ...
     def __iter__(self) -> Iterator[tuple[str, str]]: ...
     def __eq__(self, other: object) -> bool: ...
     def __ne__(self, other: object) -> bool: ...

stubs/openpyxl/openpyxl/packaging/core.pyi

@@ -1,19 +1,25 @@
 from _typeshed import Incomplete
-from typing import ClassVar
+from datetime import datetime
+from typing import ClassVar, overload
 from typing_extensions import Literal
 
 from openpyxl.descriptors import DateTime
 from openpyxl.descriptors.base import Alias
 from openpyxl.descriptors.nested import NestedText
 from openpyxl.descriptors.serialisable import Serialisable
+from openpyxl.xml.functions import Element
 
 # Does not reimplement the relevant methods, so runtime also has incompatible supertypes
 class NestedDateTime(DateTime[Incomplete], NestedText[Incomplete, Incomplete]):  # type: ignore[misc]
     expected_type: type[Incomplete]
-    def to_tree(self, tagname: str | None = None, value: Incomplete | None = None, namespace: str | None = None): ...
+    @overload  # type: ignore[override]
+    def to_tree(self, tagname: str | None = None, value: None = None, namespace: str | None = None) -> None: ...
+    @overload
+    def to_tree(self, tagname: str, value: datetime, namespace: str | None = None) -> Element: ...
 
 class QualifiedDateTime(NestedDateTime):
-    def to_tree(self, tagname: str | None = None, value: Incomplete | None = None, namespace: str | None = None): ...
+    # value cannot be None or it'll raise
+    def to_tree(self, tagname: str, value: datetime, namespace: str | None = None) -> Element: ...  # type: ignore[override]
 
 class DocumentProperties(Serialisable):
     tagname: ClassVar[str]

stubs/openpyxl/openpyxl/packaging/custom.pyi

@@ -8,6 +8,7 @@ from openpyxl.descriptors import Sequence, Strict
 from openpyxl.descriptors.base import Bool, DateTime, Float, Integer, String, _ConvertibleToBool
 from openpyxl.descriptors.nested import NestedText
 from openpyxl.descriptors.serialisable import _ChildSerialisableTreeElement
+from openpyxl.xml.functions import Element
 
 _T = TypeVar("_T")
 
@@ -51,7 +52,7 @@ class CustomPropertyList(Strict, Generic[_T]):
     @classmethod
     def from_tree(cls, tree: _ChildSerialisableTreeElement) -> Self: ...
     def append(self, prop) -> None: ...
-    def to_tree(self): ...
+    def to_tree(self) -> Element: ...
     def __len__(self) -> int: ...
     @property
     def names(self) -> list[str]: ...

stubs/openpyxl/openpyxl/packaging/extended.pyi

@@ -5,6 +5,7 @@ from typing_extensions import Literal
 from openpyxl.descriptors.base import Typed
 from openpyxl.descriptors.nested import NestedText
 from openpyxl.descriptors.serialisable import Serialisable
+from openpyxl.xml.functions import Element
 
 def get_version(): ...
 
@@ -80,4 +81,4 @@ class ExtendedProperties(Serialisable):
         AppVersion: object = None,
         DocSecurity: ConvertibleToInt | None = None,
     ) -> None: ...
-    def to_tree(self): ...
+    def to_tree(self) -> Element: ...  # type: ignore[override]

stubs/openpyxl/openpyxl/packaging/manifest.pyi

@@ -5,6 +5,7 @@ from typing_extensions import Final, Literal
 
 from openpyxl.descriptors.base import String
 from openpyxl.descriptors.serialisable import Serialisable
+from openpyxl.xml.functions import Element
 
 mimetypes: Incomplete
 
@@ -34,7 +35,7 @@ class Manifest(Serialisable):
     def filenames(self) -> list[str]: ...
     @property
     def extensions(self) -> list[tuple[str, str]]: ...
-    def to_tree(self): ...
+    def to_tree(self) -> Element: ...  # type: ignore[override]
     def __contains__(self, content_type: str) -> bool: ...
     def find(self, content_type): ...
     def findall(self, content_type) -> Generator[Incomplete, None, None]: ...

stubs/openpyxl/openpyxl/packaging/relationship.pyi

@@ -9,6 +9,7 @@ from openpyxl.descriptors.serialisable import Serialisable
 from openpyxl.pivot.cache import CacheDefinition
 from openpyxl.pivot.record import RecordList
 from openpyxl.pivot.table import TableDefinition
+from openpyxl.xml.functions import Element
 
 _SerialisableT = TypeVar("_SerialisableT", bound=Serialisable)
 _SerialisableRelTypeT = TypeVar("_SerialisableRelTypeT", bound=CacheDefinition | RecordList | TableDefinition)
@@ -41,7 +42,7 @@ class RelationshipList(Serialisable):
     def __bool__(self) -> bool: ...
     def find(self, content_type) -> Generator[Incomplete, None, None]: ...
     def __getitem__(self, key): ...
-    def to_tree(self): ...
+    def to_tree(self) -> Element: ...  # type: ignore[override]
 
 def get_rels_path(path): ...
 def get_dependents(archive: ZipFile, filename: str) -> RelationshipList: ...

stubs/openpyxl/openpyxl/packaging/workbook.pyi

@@ -13,6 +13,7 @@ from openpyxl.workbook.properties import CalcProperties, FileVersion, WorkbookPr
 from openpyxl.workbook.protection import FileSharing, WorkbookProtection
 from openpyxl.workbook.smart_tags import SmartTagList, SmartTagProperties
 from openpyxl.workbook.web import WebPublishing, WebPublishObjectList
+from openpyxl.xml.functions import Element
 
 _WorkbookPackageConformance: TypeAlias = Literal["strict", "transitional"]
 
@@ -99,6 +100,6 @@ class WorkbookPackage(Serialisable):
         extLst: Unused = None,
         Ignorable: Unused = None,
     ) -> None: ...
-    def to_tree(self): ...
+    def to_tree(self) -> Element: ...  # type: ignore[override]
     @property
     def active(self) -> int: ...

stubs/openpyxl/openpyxl/pivot/cache.pyi

@@ -9,6 +9,7 @@ from openpyxl.descriptors.nested import NestedInteger
 from openpyxl.descriptors.serialisable import Serialisable
 from openpyxl.pivot.fields import Error, Missing, Number, Text, TupleList
 from openpyxl.pivot.table import PivotArea
+from openpyxl.xml.functions import Element
 
 from ..xml._functions_overloads import _HasTagAndGet
 
@@ -710,6 +711,6 @@ class CacheDefinition(Serialisable):
         extLst: ExtensionList | None = None,
         id: Incomplete | None = None,
     ) -> None: ...
-    def to_tree(self): ...
+    def to_tree(self) -> Element: ...  # type: ignore[override]
     @property
     def path(self) -> str: ...

stubs/openpyxl/openpyxl/pivot/record.pyi

@@ -5,6 +5,7 @@ from typing_extensions import Literal
 from openpyxl.descriptors.base import Typed
 from openpyxl.descriptors.excel import ExtensionList
 from openpyxl.descriptors.serialisable import Serialisable
+from openpyxl.xml.functions import Element
 
 class Record(Serialisable):
     tagname: ClassVar[str]
@@ -38,6 +39,6 @@ class RecordList(Serialisable):
     def __init__(self, count: Unused = None, r=(), extLst: ExtensionList | None = None) -> None: ...
     @property
     def count(self) -> int: ...
-    def to_tree(self): ...
+    def to_tree(self) -> Element: ...  # type: ignore[override]
     @property
     def path(self) -> str: ...

stubs/openpyxl/openpyxl/pivot/table.pyi

@@ -6,6 +6,7 @@ from openpyxl.descriptors.base import Bool, Integer, NoneSet, Set, String, Typed
 from openpyxl.descriptors.excel import ExtensionList
 from openpyxl.descriptors.serialisable import Serialisable
 from openpyxl.worksheet.filters import AutoFilter
+from openpyxl.xml.functions import Element
 
 _PivotAreaType: TypeAlias = Literal["normal", "data", "all", "origin", "button", "topEnd", "topRight"]
 _PivotAxis: TypeAlias = Literal["axisRow", "axisCol", "axisPage", "axisValues"]
@@ -420,7 +421,7 @@ class ConditionalFormatList(Serialisable):
     def by_priority(self): ...
     @property
     def count(self) -> int: ...
-    def to_tree(self, tagname: str | None = None): ...  # type: ignore[override]
+    def to_tree(self, tagname: str | None = None) -> Element: ...  # type: ignore[override]
 
 class Format(Serialisable):
     tagname: ClassVar[str]
@@ -950,7 +951,7 @@ class TableDefinition(Serialisable):
         extLst: ExtensionList | None = None,
         id: Incomplete | None = None,
     ) -> None: ...
-    def to_tree(self): ...
+    def to_tree(self) -> Element: ...  # type: ignore[override]
     @property
     def path(self) -> str: ...
     def formatted_fields(self) -> dict[Incomplete, list[Incomplete]]: ...

stubs/openpyxl/openpyxl/styles/fills.pyi

@@ -1,4 +1,4 @@
-from _typeshed import ConvertibleToFloat, Incomplete
+from _typeshed import ConvertibleToFloat, Incomplete, Unused
 from collections.abc import Iterable, Iterator, Sequence as ABCSequence
 from typing import ClassVar
 from typing_extensions import Final, Literal, TypeAlias
@@ -7,6 +7,7 @@ from openpyxl.descriptors import Sequence, Strict
 from openpyxl.descriptors.base import Alias, Float, MinMax, NoneSet, Set
 from openpyxl.descriptors.serialisable import Serialisable
 from openpyxl.styles.colors import Color, ColorDescriptor
+from openpyxl.xml.functions import Element
 
 from ..xml._functions_overloads import _SupportsIterAndAttribAndTextAndTag
 
@@ -76,7 +77,7 @@ class PatternFill(Fill):
         start_color: str | Color | None = None,
         end_color: str | Color | None = None,
     ) -> None: ...
-    def to_tree(self, tagname: str | None = None, idx: Incomplete | None = None): ...  # type: ignore[override]
+    def to_tree(self, tagname: Unused = None, idx: Unused = None) -> Element: ...  # type: ignore[override]
 
 DEFAULT_EMPTY_FILL: Final[PatternFill]
 DEFAULT_GRAY_FILL: Final[PatternFill]
@@ -112,4 +113,4 @@ class GradientFill(Fill):
         stop=(),
     ) -> None: ...
     def __iter__(self) -> Iterator[tuple[str, str]]: ...
-    def to_tree(self, tagname: str | None = None, namespace: str | None = None, idx: Incomplete | None = None): ...  # type: ignore[override]
+    def to_tree(self, tagname: Unused = None, namespace: Unused = None, idx: Unused = None): ...  # type: ignore[override]

stubs/openpyxl/openpyxl/styles/stylesheet.pyi

@@ -12,6 +12,7 @@ from openpyxl.styles.named_styles import _NamedCellStyleList
 from openpyxl.styles.numbers import NumberFormatList
 from openpyxl.styles.table import TableStyleList
 from openpyxl.workbook.workbook import Workbook
+from openpyxl.xml.functions import Element
 
 _WorkbookT = TypeVar("_WorkbookT", bound=Workbook)
 
@@ -52,7 +53,7 @@ class Stylesheet(Serialisable):
     def from_tree(cls, node: _ChildSerialisableTreeElement) -> Self: ...
     @property
     def custom_formats(self) -> dict[int, str]: ...
-    def to_tree(self, tagname: str | None = None, idx: Incomplete | None = None, namespace: str | None = None): ...
+    def to_tree(self, tagname: str | None = None, idx: Unused = None, namespace: str | None = None) -> Element: ...
 
 def apply_stylesheet(archive: ZipFile, wb: _WorkbookT) -> _WorkbookT | None: ...
 def write_stylesheet(wb): ...

stubs/openpyxl/openpyxl/workbook/external_link/external.pyi

@@ -7,6 +7,7 @@ from openpyxl.descriptors.base import Bool, Integer, NoneSet, String, Typed, _Co
 from openpyxl.descriptors.nested import NestedText
 from openpyxl.descriptors.serialisable import Serialisable
 from openpyxl.packaging.relationship import Relationship
+from openpyxl.xml.functions import Element
 
 _ExternalCellType: TypeAlias = Literal["b", "d", "n", "e", "s", "str", "inlineStr"]
 
@@ -73,7 +74,7 @@ class ExternalLink(Serialisable):
     def __init__(
         self, externalBook: ExternalBook | None = None, ddeLink: Unused = None, oleLink: Unused = None, extLst: Unused = None
     ) -> None: ...
-    def to_tree(self): ...
+    def to_tree(self) -> Element: ...  # type: ignore[override]
     @property
     def path(self) -> str: ...
 

stubs/openpyxl/openpyxl/worksheet/datavalidation.pyi

@@ -15,6 +15,7 @@ from openpyxl.descriptors.base import (
 from openpyxl.descriptors.nested import NestedText
 from openpyxl.descriptors.serialisable import Serialisable
 from openpyxl.worksheet.cell_range import CellRange, MultiCellRange
+from openpyxl.xml.functions import Element
 
 _DataValidationType: TypeAlias = Literal["whole", "decimal", "list", "date", "time", "textLength", "custom"]
 _DataValidationErrorStyle: TypeAlias = Literal["stop", "warning", "information"]
@@ -105,4 +106,4 @@ class DataValidationList(Serialisable):
     def count(self) -> int: ...
     def __len__(self) -> int: ...
     def append(self, dv) -> None: ...
-    def to_tree(self, tagname: str | None = None): ...  # type: ignore[override]
+    def to_tree(self, tagname: str | None = None) -> Element: ...  # type: ignore[override]

stubs/openpyxl/openpyxl/worksheet/header_footer.pyi

@@ -6,6 +6,7 @@ from typing_extensions import Final, Literal, Self
 from openpyxl.descriptors import Strict
 from openpyxl.descriptors.base import Alias, Bool, Integer, MatchPattern, String, Typed, _ConvertibleToBool
 from openpyxl.descriptors.serialisable import Serialisable
+from openpyxl.xml.functions import Element
 
 from ..xml._functions_overloads import _HasText
 
@@ -39,7 +40,7 @@ class HeaderFooterItem(Strict):
         center: _HeaderFooterPart | None = None,
     ) -> None: ...
     def __bool__(self) -> bool: ...
-    def to_tree(self, tagname): ...
+    def to_tree(self, tagname: str) -> Element: ...
     @classmethod
     def from_tree(cls, node: _HasText) -> Self: ...
 

stubs/openpyxl/openpyxl/worksheet/related.pyi

@@ -1,8 +1,9 @@
-from _typeshed import Incomplete
+from _typeshed import Incomplete, Unused
 
 from openpyxl.descriptors.serialisable import Serialisable
+from openpyxl.xml.functions import Element
 
 class Related(Serialisable):
     id: Incomplete
     def __init__(self, id: Incomplete | None = None) -> None: ...
-    def to_tree(self, tagname, idx: Incomplete | None = None): ...  # type: ignore[override]
+    def to_tree(self, tagname: str | None, idx: Unused = None) -> Element: ...  # type: ignore[override]

stubs/openpyxl/openpyxl/worksheet/table.pyi

@@ -8,6 +8,7 @@ from openpyxl.descriptors.base import Alias, Bool, Integer, NoneSet, Typed, _Con
 from openpyxl.descriptors.excel import ExtensionList
 from openpyxl.descriptors.serialisable import Serialisable, _ChildSerialisableTreeElement
 from openpyxl.worksheet.filters import AutoFilter, SortState
+from openpyxl.xml.functions import Element
 
 _TableColumnTotalsRowFunction: TypeAlias = Literal[
     "sum", "min", "max", "average", "count", "countNums", "stdDev", "var", "custom"
@@ -196,7 +197,7 @@ class Table(Serialisable):
         tableStyleInfo: TableStyleInfo | None = None,
         extLst: Unused = None,
     ) -> None: ...
-    def to_tree(self): ...
+    def to_tree(self) -> Element: ...  # type: ignore[override]
     @property
     def path(self) -> str: ...
     @property