fix: provide entry file

Author: Harrison Ifeanyichukwu

rollup.config.js

@@ -2,6 +2,7 @@ const { config } = require('@teclone/rollup-all');
 module.exports = config({
   config: {
     moduleName: 'XMLSerializer',
+    entryFile: 'main.js',
     esmConfig: {
       enabled: true,
     },