TypeRegistry.jsx

const registeredTypes = {};

export default function register(type) {
  invariant(!registeredTypes.hasOwnProperty(type.name), `Cannot register duplicate type of name ${type.name}`);
  registeredTypes[type.name] = type;
}

export default function type(typeName) {
  invariant(registeredTypes.hasOwnProperty(type.name), `Unknown Type ${type.name}`);
  return registeredTypes[typeName];
}

export default function types(typeNames) {
  return function () {
    return typeNames.map(type);
  }
}


// Now you can define your schema.

register(GraphQLObjectType({
  name: "Dog",
  fields: {
    name: 'Barks'
  },
  interfaces: types(['Pet'])
}));

register(GraphQLInterfaceType({
  name: "Pet",
  fields: {
    name: 'Barks'
  }
}));