add export debug event path

src/kiri/client.js

@@ -228,6 +228,9 @@ KIRI.work = {
             if (reply.error) {
                 ondone(null, reply.error);
             }
+            if (reply.debug) {
+                KIRI.api.event.emit("export.debug", reply.debug);
+            }
         });
     },
 

src/kiri/worker.js

@@ -249,6 +249,8 @@ KIRI.worker = {
         }, function(done) {
             // SLA workaround
             output = done;
+        }, function(debug) {
+            send.data({debug});
         });
         const { bounds, time, lines, bytes, distance, settings } = current.print;