apollo-server-express, graphql custom schema directive - express

Question

This is weird for me.
According this document i made my Auth SchemaDirective like this:
class RequireAuthDirective extends SchemaDirectiveVisitor {
visitFieldDefinition(field) {
const { resolve = defaultFieldResolver } = field;
field.resolve = async (...args) => {
let [, params, { req, res, connection }] = args;
let { user } = req || connection.context;
if (!!user) {
return await resolve.apply(this, args);
} else {
throw new AuthenticationError('You must be signed in to view this resource.');
}
};
}
}
This works fine in every Query, Mutation, Subscription
But when i use an external async method to check authorization like this:
class RequireAuthDirective extends SchemaDirectiveVisitor {
visitFieldDefinition(field) {
const { resolve = defaultFieldResolver } = field;
field.resolve = async (...args) => {
let [, params, { req, res, connection }] = args;
let { user } = req || connection.context;
if (!!user) {
if (await isAllowed(user.id, field.name, params)) return await resolve.apply(this, args); // ChkPoint
throw new AuthenticationError('You are not authorized to access this resource.');
} else {
throw new AuthenticationError('You must be signed in to access this resource.');
}
};
}
}
This works fine in Queries and Mutations but not in subscriptions!
Note: if i remove the ChkPoint condition ( Which is returning true ) it will works in subscription.