Old CesiumJS codes no longer work with the new version 1.103

Good to hear that.

You might want to have a look at the other warnings, though. There are some ongoing changes regarding the options.url and the readyPromise that will be removed in Cesium 1.107. There is a detailed description of the changes in CesiumJS Ready Promise Deprecation / API Changes . It’s hard to say where and how exactly that will affect your code, but you might want to keep an eye on that.