Base ViewModel using dynamic member lookup to access object properties and property publishers

ViewModel.swift

import Combine
import Foundation

@dynamicMemberLookup
public class ViewModel<Object> {
    private var object: Object

    init(_ object: Object) {
        self.object = object
    }

    public subscript<T>(dynamicMember keyPath: WritableKeyPath<Object, T>) -> T {
        get { object[keyPath: keyPath] }
        set { object[keyPath: keyPath] = newValue }
    }
}

extension ViewModel where Object: NSObject {
    public var publishers: Publishers<Object> {
        Publishers(object)
    }

    @dynamicMemberLookup
    public struct Publishers<Object: NSObject> {
        private let object: Object

        public init(_ object: Object) {
            self.object = object
        }

        public subscript<T>(dynamicMember keyPath: KeyPath<Object, T>) -> AnyPublisher<T, Never> {
            object.publisher(for: keyPath).eraseToAnyPublisher()
        }
    }
}