book query definition

RootQuery = new GraphQLObjectType({
    name: 'RootQueryType',
    fields: {
        book: {
            type: BookType,
            args: { id: { type: GraphQLString } },
            resolve(parent, args) {
                // find data
                return lodash.find(books, {id: args.id})
            }
        }
    }
})