const Mutation = new GraphQLObjectType({
  name: 'Mutation',
  fields: {
    addGadget: {
      type: gadgetGraphQLType,
      args: {
        name: { type: GraphQLString },
        release_date: { type: GraphQLString },
        by_company: { type: GraphQLString },
        price: { type: GraphQLString }
      },
    }
  }
})