```coffeescript
define [], () ->
 defaultRepo:
   repoUser: 'oerpub'
   repoName: 'textbook-demo'
   branch: 'master'
```

Set the branch to '', that makes it use the default.
user
```coffeescript
define [], () ->
 defaultRepo:
   repoUser: 'oerpub'
   repoName: 'textbook-demo'
   branch: ''
```
assistant