# Frontend reference

> Commands, the hass object, and the bridge between the frontend and the companion apps. The details you look up.

Source: https://contributors.home-assistant.io/frontend/reference/

- [Commands](https://contributors.home-assistant.io/frontend/reference/commands/): every `pnpm` command of the frontend repository, with its port.
- [The hass object](https://contributors.home-assistant.io/frontend/reference/hass-object/): its properties, methods, and formatters.
- [External authentication](https://contributors.home-assistant.io/frontend/reference/external-auth/): how an app that embeds the frontend provides the access token.
- [External bus](https://contributors.home-assistant.io/frontend/reference/external-bus/): the messages between the frontend and the companion apps.