fix: downgrade to 3.8-compatible type hints (#10)

fixes #9

graphene_federation/entity.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import Any, Callable
+from typing import Any, Callable, Dict
 
 from graphene import List, NonNull, Union
 
@@ -11,7 +11,7 @@
 from .utils import field_name_to_type_attribute
 
 
-def get_entities(schema: Schema) -> dict[str, Any]:
+def get_entities(schema: Schema) -> Dict[str, Any]:
     """
     Find all the entities from the type map.
     They can be easily distinguished from the other type as
@@ -27,7 +27,7 @@ def get_entities(schema: Schema) -> dict[str, Any]:
     return entities
 
 
-def get_entity_cls(entities: dict[str, Any]) -> Union:
+def get_entity_cls(entities: Dict[str, Any]) -> Union:
     """
     Create _Entity type which is a union of all the entities types.
     """

graphene_federation/extend.py

@@ -1,9 +1,9 @@
-from typing import Any, Callable, Union
+from typing import Any, Callable, Union, Dict, List
 
 from graphene import Schema
 
 
-def get_extended_types(schema: Schema) -> dict[str, Any]:
+def get_extended_types(schema: Schema) -> Dict[str, Any]:
     """
     Find all the extended types from the schema.
     They can be easily distinguished from the other type as
@@ -54,7 +54,7 @@ def external(field):
     return field
 
 
-def requires(field, fields: Union[str, list[str]]):
+def requires(field, fields: Union[str, List[str]]):
     """
     Mark the required fields for a given field.
     The input `fields` can be either a string or a list.

graphene_federation/provides.py

@@ -1,10 +1,10 @@
-from typing import Any, Union
+from typing import Any, Union, Dict, List
 
 from graphene import Field
 from graphene import Schema
 
 
-def get_provides_parent_types(schema: Schema) -> dict[str, Any]:
+def get_provides_parent_types(schema: Schema) -> Dict[str, Any]:
     """
     Find all the types for which a field is provided from the schema.
     They can be easily distinguished from the other type as
@@ -19,7 +19,7 @@ def get_provides_parent_types(schema: Schema) -> dict[str, Any]:
     return provides_parent_types
 
 
-def provides(field, fields: Union[str, list[str]] = None):
+def provides(field, fields: Union[str, List[str]] = None):
     """
 
     :param field: base type (when used as decorator) or field of base type

graphene_federation/service.py

@@ -1,5 +1,7 @@
 import re
 
+from typing import List
+
 from graphql.utilities.print_schema import print_fields
 
 from graphene import ObjectType, String, Field, Schema
@@ -21,7 +23,7 @@ def __init__(self, name, field):
         self.fields = {name: field}
 
 
-def convert_fields(schema: Schema, fields: list[str]) -> str:
+def convert_fields(schema: Schema, fields: List[str]) -> str:
     get_field_name = type_attribute_to_field_name(schema)
     return " ".join([get_field_name(field) for field in fields])