chore: fix ts typings

Author: nodkz

src/types/mongoid.d.ts

@@ -1,5 +1,7 @@
 import { GraphQLScalarType } from 'graphql-compose/lib/graphql';
 
+export type MongoId = string | any;
+
 declare const GraphQLMongoID: GraphQLScalarType;
 
 export default GraphQLMongoID;