Extend the frontend
Changes to the frontend that go together with a change in Core, like a more-info view for a new domain or a WebSocket command for an integration.
Sometimes a change in Core needs something new in the frontend: a new entity domain needs controls, or an integration needs to send data the interface does not have yet. These pages cover the frontend side of that.
Each of these is a pull request to the frontend repository, usually together with one to Core. Link the two in the pull request templates, so reviewers see the whole picture. Review and release explains how the two are merged.
- Add a more-info view: the controls in the more-info dialog for a domain.
- Add a state card: the row that shows an entity and its state.
- Add a WebSocket command: send data from your integration to the frontend.
Most integrations need none of this. Entities of the existing domains already get their controls, cards, and more-info views. Look at the more-info views and dashboard cards in the Design area to see what is there.