Implementing Custom Directives

[kaptcha0]

I'm looking for a way to implement an authorize field directive.

"""
Signifies that a field requires authorization for a result to be returned
"""
directive @authorize on FIELD_DEFINITION

The idea is that any field with this directive would require the appropriate authorization to be able to access, whether it be in a Query/Mutation/Subscription or another custom type in the schema. The server, using Graphql Yoga, would make sure the client had the authorization needed to access the fields requested.

However, the documentation is not clear on how I could achieve this. The Graphql Codegen docs use a plugin, but the Graphql Tools docs say to write it in javascript. The confusing part is that Graphql Codegen generates some resolver types for the directive, as shown below.

export type DirectiveResolverFn<TResult = {}, TParent = {}, TContext = {}, TArgs = {}> = (
  next: NextResolverFn<TResult>,
  parent: TParent,
  args: TArgs,
  context: TContext,
  info: GraphQLResolveInfo
) => TResult | Promise<TResult>;

...

export type AuthorizeDirectiveArgs = { };

export type AuthorizeDirectiveResolver<Result, Parent, ContextType = any, Args = AuthorizeDirectiveArgs> = DirectiveResolverFn<Result, Parent, ContextType, Args>;

...

export type DirectiveResolvers<ContextType = any> = {
  authorize?: AuthorizeDirectiveResolver<any, any, ContextType>;
};

How would I go about using these types? If they're unusable, how can I integrate either the Graphql Tools or the plugin approach with Graphql Codegen?