@type t() :: %Gleanex.Client.CreateAnnouncementRequest{
  audienceFilters: [Gleanex.Client.FacetFilter.t()] | nil,
  banner: Gleanex.Client.Thumbnail.t() | nil,
  body: Gleanex.Client.StructuredText.t() | nil,
  channel: String.t() | nil,
  emoji: String.t() | nil,
  endTime: DateTime.t() | nil,
  hideAttribution: boolean() | nil,
  isPrioritized: boolean() | nil,
  postType: String.t() | nil,
  sourceDocumentId: String.t() | nil,
  startTime: DateTime.t() | nil,
  thumbnail: Gleanex.Client.Thumbnail.t() | nil,
  title: String.t() | nil,
  viewUrl: String.t() | nil
}