---
title: ObjectWillChangePublisher
framework: combine
role: symbol
role_heading: Associated Type
path: combine/observableobject/objectwillchangepublisher
---

# ObjectWillChangePublisher

The type of publisher that emits before the object has changed.

## Declaration

```swift
associatedtype ObjectWillChangePublisher : Publisher = ObservableObjectPublisher where Self.ObjectWillChangePublisher.Failure == Never
```

## See Also

### Publishing changes

- [objectWillChange](combine/observableobject/objectwillchange.md)