Unable to determinecesium base url in React js

Error constructing CesiumWidget.
Visit http://get.webgl.org to verify that your web browser and hardware support WebGL. Consider trying a different web browser or updating your video drivers. Detailed error information is below:
DeveloperError: Unable to determine Cesium base URL automatically, try defining a global variable called CESIUM_BASE_URL.
Error
at new DeveloperError (DeveloperError.js:39:1)
at getCesiumBaseUrl (buildModuleUrl.js:64:1)
at buildModuleUrlFromBaseUrl (buildModuleUrl.js:84:1)
at buildModuleUrl (buildModuleUrl.js:122:1)
at getDefaultCredit (CreditDisplay.js:565:1)
at Function.get (CreditDisplay.js:599:1)
at new CreditDisplay (CreditDisplay.js:347:1)
at new Scene (Scene.js:197:1)
at new CesiumWidget (CesiumWidget.js:264:1)
at new Viewer (Viewer.js:478:1)

Please give me suggestion how to fix this

Declare window.CESIUM_BASE_URL. Check out offical website webpack guidence to learn more.

Uploading: Screenshot (17).png…
kindly give me some reference to do this cockpits


Hi Gu-Miao,
kindly give me some refence how to create like this cockpits by cesium js ,kindly help me to do this

I think you should learn about CZML firstly.
wiki: Home · AnalyticalGraphicsInc/czml-writer Wiki · GitHub
doc: CzmlDataSource - Cesium Documentation
demo: Cesium Sandcastle