Feature Request: add refine method to object types with access to the collected fields

[yaacovCR]

Right now, we provide the fieldNodes as part of the info parameter for resolvers, but the fields are not collected, because the type is not yet known until the resolver returns. Since the type resolver logic may be known, resolvers can include that logic and collect fields manually based on that known type, and then perform whatever logic necessary => but that means that fields are collected twice, once by the framework, and once by the resolver. It would be great if there was a hook that could provide access to the collected fields and allow modification of the result.

The proposal: add a refine method to GraphQLObjectTypes with signature:

export type GraphQLFieldRefiner<
  TSource,
  TContext,
  TArgs = { [argument: string]: any },
  TInitialResult = unknown,
  TFinalResult = unknown,
> = (
  source: TSource,
  args: TArgs,
  context: TContext,
  info: GraphQLResolveInfo,
  initialResult: TInitialResult,
  collectedFields: Map<string, ReadonlyArray<FieldNode>>,
) => TFinalResult;

Any thoughts?

[yaacovCR]

Edited above.

[yaacovCR]

Closing this for now — can always reopen at some point if there is more interest