diff --git a/types/graphql/graphql.d.ts b/types/graphql/graphql.d.ts
index 386cdd9e1b..7282ea80f2 100644
--- a/types/graphql/graphql.d.ts
+++ b/types/graphql/graphql.d.ts
@@ -33,25 +33,40 @@ import { ExecutionResult } from "./execution/execute";
  *    If not provided, the default field resolver is used (which looks for a
  *    value or method on the source value with the field's name).
  */
-export function graphql(args: {
+export interface GraphQLArgs {
     schema: GraphQLSchema;
-    source: string | Source;
+    source: Source | string;
     rootValue?: any;
     contextValue?: any;
-    variableValues?: {
-        [key: string]: any;
-    };
-    operationName?: string;
-    fieldResolver?: GraphQLFieldResolver<any, any>;
-}): Promise<ExecutionResult>;
+    variableValues?: { [key: string]: any } | void;
+    operationName?: string | void;
+    fieldResolver?: GraphQLFieldResolver<any, any> | void;
+}
+
+export function graphql(args: GraphQLArgs): Promise<ExecutionResult>;
 export function graphql(
     schema: GraphQLSchema,
-    source: string | Source,
+    source: Source | string,
     rootValue?: any,
     contextValue?: any,
-    variableValues?: {
-        [key: string]: any;
-    },
-    operationName?: string,
-    fieldResolver?: GraphQLFieldResolver<any, any>
+    variableValues?: { [key: string]: any } | void,
+    operationName?: string | void,
+    fieldResolver?: GraphQLFieldResolver<any, any> | void
 ): Promise<ExecutionResult>;
+
+/**
+ * The graphqlSync function also fulfills GraphQL operations by parsing,
+ * validating, and executing a GraphQL document along side a GraphQL schema.
+ * However, it guarantees to complete synchronously (or throw an error) assuming
+ * that all field resolvers are also synchronous.
+ */
+export function graphqlSync(args: GraphQLArgs): ExecutionResult;
+export function graphqlSync(
+    schema: GraphQLSchema,
+    source: Source | string,
+    rootValue?: any,
+    contextValue?: any,
+    variableValues?: { [key: string]: any } | void,
+    operationName?: string | void,
+    fieldResolver?: GraphQLFieldResolver<any, any> | void
+): ExecutionResult;