GraphQL scalar for converting strings into MongoID objects.

mongoid-scalar.js

import { GraphQLScalarType } from 'graphql';
import { Kind } from 'graphql/language';
import { ObjectId } from 'mongodb';

export default new GraphQLScalarType({
    name: 'ID',
    description: 'MongoDB ObjectID string type',
    
    serialize: value => value.toString(),  
    parseValue: value => ObjectId(value),
    
    parseLiteral: ast =>
        ast.kind === Kind.STRING ?
            ObjectId(ast.value) :
            null

});