text: import { ObjectId } from 'mongodb';
  import { GraphQLScalarType } from 'graphql';
  import { Kind } from 'graphql/language';
  import { merge } from 'lodash';
  
  const resolvers = {};
  
  resolvers.ObjID = new GraphQLScalarType({
    name: 'ObjID',
    description: 'Id representation, based on Mongo Object Ids',
    parseValue(value) {
      return ObjectId(value);
    },
    serialize(value) {
      return value.toString();
    },
    parseLiteral(ast) {
      if (ast.kind === Kind.STRING) {
        return ObjectId(ast.value);
      }
      return null;
    },
  });
  
  export default resolvers;
  
  import tweetResolvers from './Tweet';
  merge(resolvers, tweetResolvers);
  
  import userResolvers from './User';
  merge(resolvers, userResolvers);
  