--- title: "Interface: Extension" description: Docker extension API reference keywords: Docker, extensions, sdk, API, reference aliases: - /desktop/extensions-sdk/dev/api/reference/interfaces/Extension/ - /extensions/extensions-sdk/dev/api/reference/interfaces/Extension/ --- **`Since`** 0.2.0 ## Properties ### vm • `Optional` `Readonly` **vm**: [`ExtensionVM`](ExtensionVM.md) ___ ### host • `Optional` `Readonly` **host**: [`ExtensionHost`](ExtensionHost.md) ___ ### image • `Readonly` **image**: `string` **`Since`** 0.3.3