@cesium-extends/common (npm): - `Widget` is a base class that you can extend to create your own widgets. You can import it into your project: - `DomUtil` is a utility class that provides some DOM manipulation methods.   [中文 Readme](./README_CN.md)
Keywords: cesium|widget|compass|drawer|extends|geojosn|heatmap|measure|plugin|popup|primitive|subscriber|sync-viewer|tooltip|zoom-controler