# publisher(for:on:componentType:) Returns a `Publisher` for events of the specified type in a `Scene`. ``` @MainActor @preconcurrency func publisher(for event: E.Type, on sourceObject: (any EventSource)? = nil, componentType: (any Component.Type)?) -> Scene.Publisher where E : Event ``` ## Parameters `event` The event type to subscribe to. For example, [`SceneEvents.Update`](/documentation/RealityKit/SceneEvents/Update). `sourceObject` The event source – usually the entity you are interested in. `nil` to listen all events of this type that occur in the scene. `componentType` The component type, or `nil` for all (for ComponentEvents). ## Return Value A `Publisher` for events of the specified type. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)