Remove TYPE_CHECKING

Author: jsignell

pystac/extensions/item_assets.py

@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 import warnings
-from typing import TYPE_CHECKING, Any, Literal
+from typing import Any, Literal
 
 import pystac
 from pystac.errors import DeprecatedWarning
@@ -13,9 +13,6 @@
 from pystac.serialization.identify import STACJSONDescription, STACVersionID
 from pystac.utils import get_required
 
-if TYPE_CHECKING:
-    pass
-
 SCHEMA_URI = "https://stac-extensions.github.io/item-assets/v1.0.0/schema.json"
 
 ITEM_ASSETS_PROP = "item_assets"