@type t() :: %LINE.Bot.MessagingApi.Model.FlexIcon{
  aspectRatio: String.t() | nil,
  margin: String.t() | nil,
  offsetBottom: String.t() | nil,
  offsetEnd: String.t() | nil,
  offsetStart: String.t() | nil,
  offsetTop: String.t() | nil,
  position: String.t() | nil,
  scaling: boolean() | nil,
  size: String.t() | nil,
  type: String.t(),
  url: Uri
}