Support Client Directives in Prisma plugin

[hayes]

The prisma plugin should support the ~@skip! ~@include! and @defer directives.

For skip and include, we can return early to exclude the fields selection if the field will not be resolved here: https://github.com/graphql/graphql-js/blob/main/src/execution/collectFields.ts#L250

For defer, it's slightly more complex because we only want to exclude it during the initial execution phase. I am not yet sure how to determine if a resolver is running deferred or not.

@stream may be useful as well for list or connection fields, but would likely be more complicated to implement

[juliobetta]

I came across this issue today... I think it would be nice to support at least @skip and @include first, which are the most common used directives. would you mind sharing the place where that early return would be? thanks!

[hayes]

@juliobetta likely it would need to be added somewhere in this function that maps a query to a prisma selection: https://github.com/hayes/pothos/blob/main/packages/plugin-prisma/src/util/map-query.ts#L38

You can see the logic the graphql execute flow uses here: https://github.com/graphql/graphql-js/blob/main/src/execution/collectFields.ts#L306

[liquiad]

I think this issue should stay open as @defer and @stream are still missing.