fix: update imports

src/streamer/parse/parse.py

@@ -1,12 +1,18 @@
-from typing import Optional
-from mistletoe import Document
-from mistletoe.block_token import Paragraph, BlockToken, Heading, List, ListItem
 from collections import Counter
 
-from .markdown_tag import TagMarkdownRenderer
+from mistletoe.block_token import (
+    BlockToken,
+    Document,
+    Heading,
+    List,
+    ListItem,
+    Paragraph,
+)
+
 from .extract_tag import extract_markers_and_tags, has_markers
-from .shard import Shard, StreamFile
 from .list import split_at
+from .markdown_tag import TagMarkdownRenderer
+from .shard import Shard, StreamFile
 
 
 def get_line_number(block_token: BlockToken) -> int:
@@ -71,7 +77,7 @@ def find_headings_by_level(
 
 def calculate_heading_level_for_next_split(
     block_tokens: list[BlockToken],
-) -> Optional[int]:
+) -> int | None:
     """
     If there is no marker in any heading, then return None.
     If only the first token is a heading with a marker, then return None.
@@ -98,7 +104,7 @@ def calculate_heading_level_for_next_split(
 
 def parse_single_block_shards(
     block_token: BlockToken, start_line: int, end_line: int
-) -> tuple[Optional[Shard], list[str]]:
+) -> tuple[Shard | None, list[str]]:
     markers, tags, children = [], [], []
 
     if isinstance(block_token, List):
@@ -137,7 +143,7 @@ def parse_multiple_block_shards(
     start_line: int,
     end_line: int,
     enforce_shard: bool = False,
-) -> tuple[Optional[Shard], list[str]]:
+) -> tuple[Shard | None, list[str]]:
     is_first_block_heading = isinstance(block_tokens[0], Heading) and has_markers(
         block_tokens[0]
     )
@@ -180,7 +186,7 @@ def parse_header_shards(
     start_line: int,
     end_line: int,
     use_first_child_as_header: bool = False,
-) -> Optional[Shard]:
+) -> Shard | None:
     if len(block_tokens) == 0:
         return build_shard(start_line, end_line)