We are currently using ArcGIS JS API 4.29 on our custom mapping applications, and noticed that the expandIconClass property for Expand icons has been deprecated in 4.31. In version 4.30+, there is no easy or "non-hacky" way to continue using our own preferred icon CSS classes instead of calcite icons. We would like that customization ability to be re-enabled, via the expandIcon or expandIconClass property in esri/widgets/Expand.
