diff --git a/playwright/_impl/_api_structures.py b/playwright/_impl/_api_structures.py
index 17d1f0346..136177f81 100644
--- a/playwright/_impl/_api_structures.py
+++ b/playwright/_impl/_api_structures.py
@@ -85,11 +85,24 @@ class LocalStorageEntry(TypedDict):
     value: str
 
 
-class OriginState(TypedDict):
+class _RequiredOriginState(TypedDict):
     origin: str
     localStorage: List[LocalStorageEntry]
 
 
+class _RequiredOPFSEntry(TypedDict):
+    path: str
+    type: Literal["directory", "file"]
+
+
+class OPFSEntry(_RequiredOPFSEntry, total=False):
+    base64: str
+
+
+class OriginState(_RequiredOriginState, total=False):
+    opfs: List[OPFSEntry]
+
+
 class PdfMargins(TypedDict, total=False):
     top: Optional[Union[str, float]]
     right: Optional[Union[str, float]]
@@ -112,6 +125,7 @@ class ProxySettings(TypedDict, total=False):
 class StorageState(TypedDict, total=False):
     cookies: List[StorageStateCookie]
     origins: List[OriginState]
+    credentials: List["VirtualCredential"]
 
 
 class ClientCertificate(TypedDict, total=False):
diff --git a/tests/test_storage_state_typing.py b/tests/test_storage_state_typing.py
new file mode 100644
index 000000000..2e8201b5a
--- /dev/null
+++ b/tests/test_storage_state_typing.py
@@ -0,0 +1,18 @@
+from typing import List, get_type_hints
+
+from playwright._impl._api_structures import (
+    OPFSEntry,
+    OriginState,
+    StorageState,
+    VirtualCredential,
+)
+
+
+def test_storage_state_optional_snapshot_fields_are_typed() -> None:
+    assert get_type_hints(StorageState)["credentials"] == List[VirtualCredential]
+    assert get_type_hints(OriginState)["opfs"] == List[OPFSEntry]
+    assert "credentials" in StorageState.__optional_keys__
+    assert "opfs" in OriginState.__optional_keys__
+    assert {"origin", "localStorage"} <= OriginState.__required_keys__
+    assert {"path", "type"} <= OPFSEntry.__required_keys__
+    assert "base64" in OPFSEntry.__optional_keys__