Using Graphql list result string!

[bkh2js]

getting throw Error('Query type must be a builtType, an array with a built type or a graphql scalar type, got ' + type); when callling buildType()

const QuestionType = buildType({
  name: 'Page',
  fields: {
    id: {type: GraphQLString},
    title: {type: GraphQLString},
    visible: {type: GraphQLBoolean},
    tags: {type: new GraphQLNonNull (new GraphQLList(GraphQLString))},
    type: {type: new GraphQLNonNull(GraphQLString)},
  }