Use a string instead of a Symbol in older environments.

browserify · May 11, 2018 · 45388f1 · 45388f1
1 parent a3958d6
commit 45388f1
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/util.js b/util.js
@@ -595,13 +595,13 @@ function hasOwnProperty(obj, prop) {
   return Object.prototype.hasOwnProperty.call(obj, prop);
 }
 
-var kCustomPromisifiedSymbol = typeof Symbol !== 'undefined' ? Symbol('util.promisify.custom') : undefined;
+var kCustomPromisifiedSymbol = typeof Symbol !== 'undefined' ? Symbol('util.promisify.custom') : 'Symbol(util.promisify.custom)';
 
 exports.promisify = function promisify(original) {
   if (typeof original !== 'function')
     throw new TypeError('The "original" argument must be of type Function');
 
-  if (kCustomPromisifiedSymbol && original[kCustomPromisifiedSymbol]) {
+  if (original[kCustomPromisifiedSymbol]) {
     var fn = original[kCustomPromisifiedSymbol];
     if (typeof fn !== 'function') {
       throw new TypeError('The "util.promisify.custom" argument must be of type Function');
@@ -642,7 +642,7 @@ exports.promisify = function promisify(original) {
 
   Object.setPrototypeOf(fn, Object.getPrototypeOf(original));
 
-  if (kCustomPromisifiedSymbol) Object.defineProperty(fn, kCustomPromisifiedSymbol, {
+  Object.defineProperty(fn, kCustomPromisifiedSymbol, {
     value: fn, enumerable: false, writable: false, configurable: true
   });
   return Object.defineProperties(