11_union_search.js

const schema = new GraphQLSchema({
  query: new GraphQLObjectType({
    name: 'RootQueryType',
    fields: {
      search: {
        type: new GraphQLList(SearchableType),
        args:  {
          text: { type : new GraphQLNonNull(GraphQLString) }
        },
        resolve(root, args) {
          const text = args.text;
          return DATA.filter((d) => {
            const searchableProperty = d.username || d.director || d.author;
            return searchableProperty.indexOf(text) !== -1;
          });
        }
      }
    }
  })
});