Better typing for payload about pioneer HOT 1 CLOSED

import enum GraphQL.Map
import class JSONEncoder
import class JSONDecoder

extension Map {
    public func into<T: Decodable>(_ dataType: T.Type) throws -> T {
        let data = try JSONEncoder().encode(self)
        return try JSONDecoder().decode(dataType, from: data)
    }
}


// ...

server.vaporMiddleware(
    websocketContext: { req, payload, gql in
        let myPayload = payload.into(MyPayload.self)
        // do something with it
    }
)

public typealias VaporCustomWebSocketContext<P: Decodable> = @Sendable (Request, P, GraphQLRequest) async throws -> Context

public typealias VaporCustomWebSocketGuard<P: Decodable> = @Sendable (Request, P) async throws -> Void

public func vaporMiddleware<CustomPayload: Decodable>(
    ...,
    websocketContext: VaporCustomWebSocketContext<CustomPayload>,
    websocketGuard: VaporCustomWebSocketGuard<CustomPayload>
) -> VaporGraphQLMiddleware {
    vaporMiddleware(
        ...,
        websocketContext: { req, payload, gql in 
            let custom = payload.into(CustomPayload.self) 
            return try await websocketContext(req, custom, gql)
        },
        websocketGuard: { req, payload in 
            let custom = payload.into(CustomPayload.self) 
            return try await websocketGuard(req, custom)
        }
    )
}