It is easy to get the selected part of a Excel 365 document with
Office.context.document.getSelectedDataAsync()
But how do I get the complete sheet?
Right now, the only two things you can do are
Office.context.documents.getSelectedDataAsync();
and
Office.context.document.getFileAsync();
We're unable to pull a sheet directly. Though, depending on the amount of data you're pulling, you may be able to use
Office.FilterType.OnlyVisible