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Currently we dont have ServerSideExporting support in TreeGrid. As of now, we have only clientside Exporting support. Need to implement this in server end which can reduce performance issue.
Reference documentation Link in Grid.
https://ej2.syncfusion.com/angular/documentation/grid/excel-exporting/#server-dependencies
https://ej2.syncfusion.com/angular/documentation/grid/pdf-export/#exporting-grid-in-server