Weak property Wrapper

Weak.swift

@propertyWrapper
public struct Weak<Wrapped: AnyObject> {
    private weak var value: AnyObject?

    public init(_ value: Wrapped? = nil) {
        self.value = value
    }

    public var wrappedValue: Wrapped? {
        get { value as? Wrapped }
        set { value = newValue }
    }
}