SubscriptionsTransportWS.OperationMessage.as_json

You're seeing just the function as_json, go back to SubscriptionsTransportWS.OperationMessage module for more information.

Prepare message for transport, removing any keys with nil values.

iex> %OperationMessage{type: "complete", id: "1"} |> OperationMessage.as_json
%{id: "1", type: "complete"}