| proj | The implicit this parameter for the extension method. |
| mainTarget | The GUID of the main target to link the watch extension to. |
| name | The name of the watch extension. |
| bundleId | The bundle ID of the watch extension. This bundle ID must include the bundle ID that is later used for watch app as a prefix. That is, the structure of the ID is as follows: watchAppBundleId + ".a_subdomain". |
| infoPlistPath | Path to the watch extension Info.plist document. |
string The GUID of the new target.
Creates a watch extension.