diff --git a/node_modules/rollup-plugin-node-polyfills/polyfills/util.js b/node_modules/rollup-plugin-node-polyfills/polyfills/util.js
index 2194380..4ef385e 100644
--- a/node_modules/rollup-plugin-node-polyfills/polyfills/util.js
+++ b/node_modules/rollup-plugin-node-polyfills/polyfills/util.js
@@ -572,6 +572,19 @@ function hasOwnProperty(obj, prop) {
   return Object.prototype.hasOwnProperty.call(obj, prop);
 }
 
+export function promisify(fn) {
+  return function() {
+    return new Promise((resolve, reject) => {
+      fn(...arguments, function(err, data) {
+        if (err !== null) {
+          return reject(err);
+        }
+        return resolve(data);
+      })
+    })
+  };
+};
+
 export default {
   inherits: inherits,
   _extend: _extend,