Use modern union syntax throughout

Author: oschwald

maxminddb/decoder.py

@@ -1,7 +1,9 @@
 """Decoder for the MaxMind DB data section."""
 
+from __future__ import annotations
+
 import struct
-from typing import ClassVar, Union, cast
+from typing import TYPE_CHECKING, ClassVar, cast
 
 try:
     import mmap
@@ -10,16 +12,18 @@
 
 
 from maxminddb.errors import InvalidDatabaseError
-from maxminddb.file import FileBuffer
-from maxminddb.types import Record
+
+if TYPE_CHECKING:
+    from maxminddb.file import FileBuffer
+    from maxminddb.types import Record
 
 
 class Decoder:
     """Decoder for the data section of the MaxMind DB."""
 
     def __init__(
         self,
-        database_buffer: Union[FileBuffer, "mmap.mmap", bytes],
+        database_buffer: FileBuffer | mmap.mmap | bytes,
         pointer_base: int = 0,
         pointer_test: bool = False,  # noqa: FBT001, FBT002
     ) -> None:

maxminddb/types.py

@@ -1,14 +1,18 @@
 """Types representing database records."""
 
-from typing import AnyStr, Union
+from __future__ import annotations
 
-Primitive = Union[AnyStr, bool, float, int]
-Record = Union[Primitive, "RecordList", "RecordDict"]
+from typing import AnyStr, TypeAlias
 
+Primitive: TypeAlias = AnyStr | bool | float | int
 
-class RecordList(list[Record]):
+
+class RecordList(list["Record"]):
     """RecordList is a type for lists in a database record."""
 
 
-class RecordDict(dict[str, Record]):
+class RecordDict(dict[str, "Record"]):
     """RecordDict is a type for dicts in a database record."""
+
+
+Record: TypeAlias = Primitive | RecordList | RecordDict