Possible Resolver Types

Hi 👋,

while looking at the source code of graphql-yoga and graphql-js I found out that resolvers can take different “shapes”.

So far, I have found GraphQLFieldResolver and GraphQLScalarType which have very similar structure, IResolverOptions which handles subscriptions, and a special case when using Fragments.

interface IResolverOptions {
  resolve?: GraphQLFieldResolver<any, any>
  subscribe?: GraphQLFieldResolver<any, any>
  __resolveType?: GraphQLTypeResolver<any, any>
  __isTypeOf?: GraphQLIsTypeOfFn<any, any>
}

type  GraphQLFieldResolver = Promise
type  GraphQLScalarType = Promise

interface WithFragment {
  fragment: string
  resolve: GraphQLFieldResolver<any, any>
}

Are there any other types/cases?

PS.: Is WithFragment case the same as IResolverOptions?

EDIT:

withFragment

const resolver = {
  fragment: `fragment Likes on User { id }`,
  resolve: async ({ id }, args, ctx, info) => {
    return 0
  }
}

IResolverOptions

const resolver = {
  resolve: async ({ id }, args, ctx, info) => {
    return 'something'
  }
}

Since both of these have resolve option and resolvers part is nowhere explicitly defined, I thought they might be of the same Type.

[schickling]

I’d love to hear @IvanGoncharov’s thoughts on this as he’s very familiar with the graphql-js implementation.

[stale[bot]]

Hey 👋, It seems like this issue has been inactive for some time. In need for maintaining clear overview of the issues concerning the latest version of graphql-yoga we’ll close it. Feel free to reopen it at any time if you believe we should futher discuss its content. 🙂