Replied 8 April 2020, 10:50 pm EST
Thank you for evaluating SpreadJS.
We are sorry but as part of our licensing policy, we do not provide demo code for Designer, however, you may test the designer using the following online demo:https://www.grapecity.com/spreadjs/designer/content/index.html
Further, please note that SJS Designer is not an angular application, it is written using pureJS and JQuery. After purchasing the designer license, you become entitled to get the source code for the Designer which you may modify further according to your requirement.
Feel free to ask if you have any doubts.