ARAravind Ravi Syncfusion Team February 7, 2019 05:27 AM
The upgrade method is used to upgrade the JSON data saved from older version of diagram to later version. That is if we depreciated any API in newer version or any behavior changes, the upgrade method will convert the older version JSON data to newer version.
This method no longer needed in your application side. While loading the diagram, we will upgrade the data to newer version and will load the diagram.