1 files changed, 7 insertions, 5 deletions
diff --git a/jwt/api_jwk.py b/jwt/api_jwk.py
index aae2cf1..bbd8a9e 100644
--- a/jwt/api_jwk.py
+++ b/jwt/api_jwk.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import json
 
 from .algorithms import get_default_algorithms
@@ -74,15 +76,15 @@ class PyJWK:
 
 
 class PyJWKSet:
-    def __init__(self, keys):
+    def __init__(self, keys: list[dict]) -> None:
         self.keys = []
 
-        if not keys or not isinstance(keys, list):
-            raise PyJWKSetError("Invalid JWK Set value")
-
-        if len(keys) == 0:
+        if not keys:
             raise PyJWKSetError("The JWK Set did not contain any keys")
 
+        if not isinstance(keys, list):
+            raise PyJWKSetError("Invalid JWK Set value")
+
         for key in keys:
             try:
                 self.keys.append(PyJWK(key))