[Refactor] use has-tostringtag to behave correctly in the presence of symbol shams

Author: ljharb

Diff for: index.js

@@ -20,6 +20,10 @@ var bigIntValueOf = typeof BigInt === 'function' ? BigInt.prototype.valueOf : nu
 var gOPS = Object.getOwnPropertySymbols;
 var symToString = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ? Symbol.prototype.toString : null;
 var hasShammedSymbols = typeof Symbol === 'function' && typeof Symbol.iterator === 'object';
+// ie, `has-tostringtag/shams
+var toStringTag = typeof Symbol === 'function' && Symbol.toStringTag && (typeof Symbol.toStringTag === hasShammedSymbols ? 'object' : 'symbol')
+    ? Symbol.toStringTag
+    : null;
 var isEnumerable = Object.prototype.propertyIsEnumerable;
 
 var gPO = (typeof Reflect === 'function' ? Reflect.getPrototypeOf : Object.getPrototypeOf) || (
@@ -32,7 +36,6 @@ var gPO = (typeof Reflect === 'function' ? Reflect.getPrototypeOf : Object.getPr
 
 var inspectCustom = require('./util.inspect').custom;
 var inspectSymbol = inspectCustom && isSymbol(inspectCustom) ? inspectCustom : null;
-var toStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag !== 'undefined' ? Symbol.toStringTag : null;
 
 module.exports = function inspect_(obj, options, depth, seen) {
     var opts = options || {};

Diff for: package.json

@@ -10,6 +10,7 @@
     "eslint": "^7.30.0",
     "for-each": "^0.3.3",
     "functions-have-names": "^1.2.2",
+    "has-tostringtag": "^1.0.0",
     "make-arrow-function": "^1.2.0",
     "nyc": "^10.3.2",
     "safe-publish-latest": "^1.1.4",

Diff for: test/bigint.js

@@ -2,7 +2,7 @@
 
 var inspect = require('../');
 var test = require('tape');
-var hasSymbols = require('has-symbols/shams')();
+var hasToStringTag = require('has-tostringtag/shams')();
 
 test('bigint', { skip: typeof BigInt === 'undefined' }, function (t) {
     t.test('primitives', function (st) {
@@ -30,7 +30,7 @@ test('bigint', { skip: typeof BigInt === 'undefined' }, function (t) {
         st.equal(inspect(Function('return 256n')()), '256n');
     });
 
-    t.test('toStringTag', { skip: !hasSymbols || typeof Symbol.toStringTag === 'undefined' }, function (st) {
+    t.test('toStringTag', { skip: !hasToStringTag }, function (st) {
         st.plan(1);
 
         var faker = {};

Diff for: test/fakes.js

@@ -2,10 +2,10 @@
 
 var inspect = require('../');
 var test = require('tape');
-var hasSymbols = require('has-symbols/shams')();
+var hasToStringTag = require('has-tostringtag/shams')();
 var forEach = require('for-each');
 
-test('fakes', { skip: !hasSymbols || typeof Symbol.toStringTag === 'undefined' }, function (t) {
+test('fakes', { skip: !hasToStringTag }, function (t) {
     forEach([
         'Array',
         'Boolean',

Diff for: test/toStringTag.js

@@ -1,11 +1,11 @@
 'use strict';
 
 var test = require('tape');
-var hasSymbols = require('has-symbols/shams')();
+var hasToStringTag = require('has-tostringtag/shams')();
 
 var inspect = require('../');
 
-test('Symbol.toStringTag', { skip: !hasSymbols || typeof Symbol.toStringTag === 'undefined' }, function (t) {
+test('Symbol.toStringTag', { skip: !hasToStringTag }, function (t) {
     t.plan(4);
 
     var obj = { a: 1 };

Diff for: test/values.js

@@ -3,6 +3,7 @@
 var inspect = require('../');
 var test = require('tape');
 var hasSymbols = require('has-symbols/shams')();
+var hasToStringTag = require('has-tostringtag/shams')();
 
 test('values', function (t) {
     t.plan(1);
@@ -76,7 +77,7 @@ test('symbols', { skip: !hasSymbols }, function (t) {
         t.equal(inspect(Object(sym)), 'Object(Symbol(foo))', 'Object(Symbol("foo")) should be "Object(Symbol(foo))"');
     }
 
-    t.test('toStringTag', { skip: !hasSymbols || typeof Symbol.toStringTag === 'undefined' }, function (st) {
+    t.test('toStringTag', { skip: !hasToStringTag }, function (st) {
         st.plan(1);
 
         var faker = {};