OLMapEvent: | keyof WindowEventMap | "loadstart" | "loadend" | "loaderror" | "visibilitychanged" | "vertexmodified" | "sketchstarted" | "sketchmodified" | "move" | "movestart" | "moveend" | "added" | "removed" | "addlayer" | "removelayer" | "changelayer" | "zoomend"