remove the viewer ext

package.json

     "dist"
   ],
   "dependencies": {
-    "@dvgis/dc-common": "^4.0.0"
+    "@dvgis/dc-common": "^4.0.1"
   }
 }

src/modules/exts/index.js

 
 export { default as BaseLayerPicker } from './BaseLayerPicker.js'
 export { default as GroundSkyBox } from './GroundSkyBox.js'
-export { default as CesiumViewer } from './Viewer.js'

src/modules/viewer/Viewer.js

 import { Transform } from '../transform'
 import createWidgets from '../widget'
 import createTools from '../tools'
-import { BaseLayerPicker, CesiumViewer } from '../exts'
+import { BaseLayerPicker } from '../exts'
 
 const DEF_OPTS = {
-  creditContainer: undefined,
+  creditContainer: document.createElement('div'),
+  creditViewport: document.createElement('div'),
+  baseLayer: false,
   shouldAnimate: true,
 }
 
     this._delegate =
       typeof container !== 'string'
         ? container
-        : new CesiumViewer(container, {
+        : new Cesium.CesiumWidget(container, {
             ...DEF_OPTS,
             ...options,
           }) // Initialize the viewer
 
+    this._delegate.canvas.parentNode.className = 'viewer-canvas'
+
     /**
      *  Registers events
      */

src/modules/widget/type/HawkeyeMap.js

 import { Util, DomUtil } from '../../utils'
 import { SceneEventType } from '../../event'
 import Widget from '../Widget'
-import { CesiumViewer } from '../../exts'
 
 class HawkeyeMap extends Widget {
   constructor() {
    * @private
    */
   _mountContent() {
-    let map = new CesiumViewer(this._wrapper, {
+    let map = new Cesium.CesiumWidget(this._wrapper, {
       sceneMode: Cesium.SceneMode.SCENE2D,
+      creditContainer: document.createElement('div'),
+      creditViewport: document.createElement('div'),
+      baseLayer: false,
     })
     map.imageryLayers.removeAll()
+    map.canvas.parentNode.className = 'viewer-canvas'
     Util.merge(map.scene.screenSpaceCameraController, {
       enableRotate: false,
       enableTranslate: false,