feat: use a global symbol for util.promisify.custom

ExE-Boss · ExE-Boss · commit e4a1d5b392b1 · 2020-02-08T15:08:03.000+01:00
Define `util.promisify.custom` as `Symbol.for("nodejs.util.inspect.custom")`, rather than as `Symbol("util.inspect.custom")`. This allows custom `promisify` wrappers to easily/safely be defined in non‑Node.js environments. Refs: nodejs/node#31647 Refs: nodejs/node#31672
diff --git a/implementation.js b/implementation.js
@@ -23,7 +23,8 @@ var $forEach = callBound('Array.prototype.forEach');
 
 var hasSymbols = require('has-symbols')();
 
-var kCustomPromisifiedSymbol = hasSymbols ? Symbol('util.promisify.custom') : null;
+// eslint-disable-next-line no-restricted-properties
+var kCustomPromisifiedSymbol = hasSymbols ? Symbol['for']('nodejs.util.promisify.custom') : null;
 var kCustomPromisifyArgsSymbol = hasSymbols ? Symbol('customPromisifyArgs') : null;
 
 module.exports = function promisify(orig) {
