fix not works in preview mode issue

README.md

@@ -240,6 +240,7 @@ public class Test2 {
 - **Key Prefixes**: Use the `prefix` parameter to prevent key collisions when multiple classes use the same property names.
 - **Custom Keys**: Use `@DefaultsKey` to specify custom keys for properties.
 - **Prefixe Charters**: The prefix must not contain '.' characters.
+_ **Preview Environment**: Due to functionality limitations, instances in preview mode cannot respond to external UserDefaults changes.
 
 ## License
 

Sources/ObservableDefaultsMacros/Macros/DefaultsBackedMacro.swift

@@ -85,7 +85,9 @@ extension DefaultsBackedMacro: AccessorMacro {
             """
             set {
                 let key = _prefix + "\(raw: keyString)"
-                if _isExternalNotificationDisabled || _ignoredKeyPathsForExternalUpdates.contains(\\.\(identifier)) {
+                if _isExternalNotificationDisabled || 
+                   _ignoredKeyPathsForExternalUpdates.contains(\\.\(identifier)) ||
+                   ProcessInfo.processInfo.environment["XCODE_RUNNING_FOR_PREVIEWS"] == "1" {
                     withMutation(keyPath: \\.\(identifier)) {
                         UserDefaultsWrapper.setValue(key, newValue, _userDefaults)
                     }

Sources/ObservableDefaultsMacros/Macros/ObservableDefaultsMacro.swift

@@ -171,7 +171,7 @@ extension ObservableDefaultsMacros: MemberMacro {
             private var observer: DefaultsObservation?
 
             /// The observation registrar is used to manage the observation of changes to UserDefaults.
-            /// It ensures that the observer is properly registered and deregistered when the instance is created and deinitialized.
+            /// It ensures that the observer is properly registered and deregistered when the instance is created and deInitialized.
             /// The registrar is accessed through the `_$observationRegistrar` property.
             ///
             /// - Note: This property is internal and can be accessed within the same module.