@type t() :: %ChatKitty.Model.SendChannelMessageRequest{
  body: String.t(),
  file: ChatKitty.Model.CreateExternalFileProperties.t(),
  groupTag: String.t() | nil,
  properties: %{optional(String.t()) => AnyType} | nil,
  type: String.t(),
  user: ChatKitty.Model.AddChannelMemberRequest.t() | nil
}