Hi there
I just found a solution:
Step 1: edit swf library - Tools.hx - function processLibraries
find this line :
output.sources.push(generatedPath);
Comment or delete it
Step 2: cd to swf library then rebuild it
haxe rebuild.hxml
Step 3: open _generated folder and copy haxe files to your Source folder
And then you can edit the exported classes for your swf assets
Not sure if I’m doing right way, but it works