Make typing compatible with python 3.9

Author: has2k1

quartodoc/pandoc/blocks.py

@@ -3,20 +3,19 @@
 """
 from __future__ import annotations
 
-import sys
+import collections.abc as abc
 import itertools
+import sys
 import typing
-import collections.abc as abc
 
-from typing import Literal, Optional, Sequence
+from textwrap import indent
+from dataclasses import dataclass
+from typing import Literal, Optional, Sequence, Union
 if sys.version_info >= (3, 10):
     from typing import TypeAlias
 else:
     TypeAlias = "TypeAlias"
 
-from textwrap import indent
-from dataclasses import dataclass
-
 from quartodoc.pandoc.components import Attr
 from quartodoc.pandoc.inlines import (
     Inline,
@@ -83,8 +82,8 @@ def as_list_item(self):
 
 # TypeAlias declared here to avoid forward-references which
 # break beartype
-ContentItem: TypeAlias = str | Inline | Block
-BlockContent: TypeAlias = ContentItem | Sequence[ContentItem]
+ContentItem: TypeAlias = Union[str, Inline, Block]
+BlockContent: TypeAlias = Union[ContentItem, Sequence[ContentItem]]
 DefinitionItem: TypeAlias = tuple[InlineContent, BlockContent]
 
 

quartodoc/pandoc/inlines.py

@@ -8,7 +8,7 @@
 
 from dataclasses import dataclass
 from pathlib import Path
-from typing import Optional, Sequence
+from typing import Optional, Sequence, Union
 if sys.version_info >= (3, 10):
     from typing import TypeAlias
 else:
@@ -66,7 +66,7 @@ def as_list_item(self):
 
 # TypeAlias declared here to avoid forward-references which
 # break beartype
-InlineContent: TypeAlias = str | Inline | Sequence[str | Inline]
+InlineContent: TypeAlias = Union[str, Inline, Union[Sequence[str], Inline]]
 
 
 @dataclass