feat: Add fallback to Symbol.for(…)

index.js

@@ -16,9 +16,13 @@ var match = String.prototype.match;
 var bigIntValueOf = typeof BigInt === 'function' ? BigInt.prototype.valueOf : null;
 
 var inspectCustom = require('./util.inspect').custom;
+if (!inspectCustom && typeof Symbol === 'function' && typeof Symbol.for === 'function') {
+	inspectCustom = Symbol.for('nodejs.util.inspect.custom');
+}
+
 var inspectSymbol = inspectCustom && isSymbol(inspectCustom) ? inspectCustom : null;
 
-module.exports = function inspect_(obj, options, depth, seen) {
+exports = module.exports = function inspect_(obj, options, depth, seen) {
     var opts = options || {};
 
     if (has(opts, 'quoteStyle') && (opts.quoteStyle !== 'single' && opts.quoteStyle !== 'double')) {
@@ -143,6 +147,10 @@ module.exports = function inspect_(obj, options, depth, seen) {
     return String(obj);
 };
 
+if (inspectSymbol) {
+	exports.custom = inspectSymbol;
+}
+
 function wrapQuotes(s, defaultStyle, opts) {
     var quoteChar = (opts.quoteStyle || defaultStyle) === 'double' ? '"' : "'";
     return quoteChar + s + quoteChar;