OverlayAddedEvent:
| { success: true; layername: string }
| { success: false; layername: string; error?: unknown }
類型宣告
- { success: true; layername: string }
success: true
layername: string
- { success: false; layername: string; error?: unknown }
success: false
layername: string
可選error?: unknown
疊加圖層新增事件。