defaultValue has been deprecated and will be removed in Cesium 1.134. U #315
Description
defaultValue has been deprecated and will be removed in Cesium 1.134. Use the nullish coalescing operator instead: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing
defaultValue.EMPTY_OBJECT has been deprecated and will be removed in Cesium 1.134. Use Frozen.EMPTY_OBJECT instead
