Gapplin's AppleScript dictionary has "export" command.
I had a test to export svg to tiff image by AppleScript. It works with v1.2. But it does not work with v1.6.3.
In macOS 10.14.6 & macOS 10.13.6, export command occured AppleEvent timed out.
In macOS 10.15.7 and 11.0 beta, export command occured "Bad keyform error" (number -10002)