Type Alias: MainToolbarIcon

type MainToolbarIcon = 
  | "about"
  | "download"
  | "flip-horizontal"
  | "flip-vertical"
  | "magnify-minus-outline"
  | "magnify-plus-outline"
  | "magnify"
  | "open"
  | "print"
  | "rotate"
  | "edit-undo"
  | "edit-redo";

Image Viewer toolbar icons list