suppress hoist_props on export (#2463)

Miscellaneous
- fix double semi-colons from `beautify` in `export`

fixes #2462

lib/output.js

@@ -1361,6 +1361,7 @@ function OutputStream(options) {
             self.exported_value.print(output);
         } else if (self.exported_definition) {
             self.exported_definition.print(output);
+            if (self.exported_definition instanceof AST_Definitions) return;
         }
         if (self.module_name) {
             output.space();