no resolver when adding directive to scalar field

[fc-io]

Tried adding a directive to a field

  type Article {
    id: ID!
    authorId: ID!
    authorName: String!
    articleName: String!
    link: String! @hasScope(scope: ["write:articles"])
    review: Review
  }

...but it throws on oldResolve.call as it does not have a field.resolve.

graphql-auth/directives/index.js

Lines 68 to 72 in 8d47457

	field.resolve = function() {
	const [source, _, context, info] = arguments;
	let promise = oldResolve.call(field, ...arguments);
	const isPrimitive = !(promise instanceof Promise);

I'm not sure what would be appropriate here (have never built a graphql server before).

Made it work by making the following additions:

const {defaultFieldResolver} = require('graphql');
// ...
let promise = oldResolve ? oldResolve.call(field, ...arguments) : defaultFieldResolver.call(field, ...arguments)

[giautm]

        const oldResolve = field.resolve || defaultFieldResolver;

@fc-io : shorten. :D