Values.ChannelsSourceval to_value :
NotificationChannel.t list ->
[> `List of
[> `Structure of
(string
* [> `String of NotificationChannelId.t
| `Structure of
(string
* [> `Structure of
(string
* [> `List of [> `Enum of string ] list
| `String of TopicArn.t ])
list ])
list ])
list ]
list ]