chore: use Union instead of | notation

resend/__init__.py

@@ -10,8 +10,8 @@
 from .version import get_version
 
 # Config vars
-api_key: str | None = os.environ.get("RESEND_API_KEY")
-api_url: str | None = os.environ.get("RESEND_API_URL", "https://api.resend.com")
+api_key = os.environ.get("RESEND_API_KEY")
+api_url = os.environ.get("RESEND_API_URL", "https://api.resend.com")
 
 # API resources
 from .emails._emails import Emails  # noqa

resend/emails/_email.py

@@ -1,12 +1,12 @@
-from typing import List
+from typing import List, Union
 
 
 class Email:
     id: str
     """
     The Email ID.
     """
-    to: List[str] | str
+    to: Union[List[str], str]
     """
     List of email addresses to send the email to.
     """
@@ -31,15 +31,15 @@ class Email:
     """
     The text content of the email.
     """
-    bcc: List[str] | str
+    bcc: Union[List[str], str]
     """
     Bcc
     """
-    cc: List[str] | str
+    cc: Union[List[str], str]
     """
     Cc
     """
-    reply_to: List[str] | str
+    reply_to: Union[List[str], str]
     """
     Reply to
     """

resend/emails/_emails.py

@@ -1,4 +1,4 @@
-from typing import Any, Dict, List, cast
+from typing import Any, Dict, List, Union, cast
 
 from typing_extensions import NotRequired, TypedDict
 
@@ -15,23 +15,23 @@ class SendParams(TypedDict):
         The email address of the sender.
         "from" is a reserved keyword in python, so we use "sender" here instead
         """
-        to: str | List[str]
+        to: Union[str, List[str]]
         """
         List of email addresses to send the email to.
         """
         subject: str
         """
         The subject of the email.
         """
-        bcc: NotRequired[List[str] | str]
+        bcc: NotRequired[Union[List[str], str]]
         """
         Bcc
         """
-        cc: NotRequired[List[str] | str]
+        cc: NotRequired[Union[List[str], str]]
         """
         Cc
         """
-        reply_to: NotRequired[List[str] | str]
+        reply_to: NotRequired[Union[List[str], str]]
         """
         Reply to
         """

resend/exceptions.py

@@ -26,7 +26,7 @@ class ResendError(Exception):
 
     def __init__(
         self,
-        code: str | int,
+        code: str,
         error_type: str,
         message: str,
         suggested_action: str,
@@ -45,7 +45,7 @@ def __init__(
         self,
         message: str,
         error_type: str,
-        code: str | int,
+        code: str,
     ):
         suggested_action = """Include the following header
         Authorization: Bearer YOUR_API_KEY in the request."""
@@ -68,7 +68,7 @@ def __init__(
         self,
         message: str,
         error_type: str,
-        code: str | int,
+        code: str,
     ):
         suggested_action = """Generate a new API key in the dashboard."""
 
@@ -88,7 +88,7 @@ def __init__(
         self,
         message: str,
         error_type: str,
-        code: str | int,
+        code: str,
     ):
         default_message = """
         The request body is missing one or more required fields."""
@@ -101,7 +101,7 @@ def __init__(
 
         ResendError.__init__(
             self,
-            code=code or 400,
+            code=code or "400",
             message=message,
             suggested_action=suggested_action,
             error_type=error_type,
@@ -162,19 +162,7 @@ def __init__(
 
 
 # Dict with error code -> error type mapping
-ERRORS: Dict[
-    str,
-    Dict[
-        str,
-        type[
-            ValidationError
-            | MissingApiKeyError
-            | MissingRequiredFieldsError
-            | InvalidApiKeyError
-            | ApplicationError
-        ],
-    ],
-] = {
+ERRORS: Dict = {
     "400": {"validation_error": ValidationError},
     "422": {"missing_required_fields": MissingRequiredFieldsError},
     "401": {"missing_api_key": MissingApiKeyError},