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// Property Wrapper Definition

@propertyWrapper
struct UserDefault<T> {
    let key: String
    let defaultValue: T

    init(_ key: String, defaultValue: T) {
        self.key = key
        self.defaultValue = defaultValue
    }

    var wrappedValue: T {
        get {
            return UserDefaults.standard.object(forKey: key) as? T ?? defaultValue
        }
        set {
            UserDefaults.standard.set(newValue, forKey: key)
        }
    }
}

// Usage

struct UserDefaultsConfig {
    @UserDefault("has_seen_app_introduction", defaultValue: false)
    static var hasSeenAppIntroduction: Bool
}

UserDefaultsConfig.hasSeenAppIntroduction = false
print(UserDefaultsConfig.hasSeenAppIntroduction) // Prints: false