added a workaround for Chrome 38-40 bug which does not allow to inher…

…it symbols (incl. well-known) from DOM collections prototypes to instances

#37
#406

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## Changelog
 ##### Unreleased
+- Added a workaround for Chrome 38-40 bug which does not allow to inherit symbols (incl. well-known) from DOM collections prototypes to instances, [#37](https://github.com/zloirock/core-js/issues/37)
 - Used `NumericRangeIterator` as toStringTag instead of `RangeIterator` in `{ Number, BigInt }.range` iterator, per [this PR](https://github.com/tc39/proposal-Number.range/pull/46)
 - TypedArray constructors marked as supported from Safari 14.0
 - Updated compat data mapping for iOS Safari and Opera for Android

packages/core-js-compat/src/data.js

@@ -29,7 +29,7 @@ const data = {
     safari: '10.0',
   },
   'es.symbol.iterator': {
-    chrome: '39',
+    chrome: '41',
     edge: '13',
     firefox: '36',
     safari: '9.0',
@@ -78,7 +78,7 @@ const data = {
     safari: '10.0',
   },
   'es.symbol.unscopables': {
-    chrome: '39',
+    chrome: '41',
     edge: '13',
     firefox: '48',
     safari: '9.0',
@@ -880,7 +880,7 @@ const data = {
     safari: '10.0',
   },
   'es.string.iterator': {
-    chrome: '39',
+    chrome: '41',
     edge: '13',
     firefox: '36',
     safari: '9.0',

packages/core-js/internals/native-symbol.js

@@ -1,7 +1,11 @@
+var IS_NODE = require('../internals/engine-is-node');
+var V8_VERSION = require('../internals/engine-v8-version');
 var fails = require('../internals/fails');
 
 module.exports = !!Object.getOwnPropertySymbols && !fails(function () {
-  // Chrome 38 Symbol has incorrect toString conversion
   /* global Symbol -- required for testing */
-  return !String(Symbol());
+  return !Symbol.sham &&
+    // Chrome 38 Symbol has incorrect toString conversion
+    // Chrome 38-40 symbols are not inherited from DOM collections prototypes to instances
+    (IS_NODE ? V8_VERSION === 38 : V8_VERSION > 37 && V8_VERSION < 41);
 });

packages/core-js/internals/well-known-symbol.js

@@ -10,8 +10,11 @@ var Symbol = global.Symbol;
 var createWellKnownSymbol = USE_SYMBOL_AS_UID ? Symbol : Symbol && Symbol.withoutSetter || uid;
 
 module.exports = function (name) {
-  if (!has(WellKnownSymbolsStore, name)) {
-    if (NATIVE_SYMBOL && has(Symbol, name)) WellKnownSymbolsStore[name] = Symbol[name];
-    else WellKnownSymbolsStore[name] = createWellKnownSymbol('Symbol.' + name);
+  if (!has(WellKnownSymbolsStore, name) || !(NATIVE_SYMBOL || typeof WellKnownSymbolsStore[name] == 'string')) {
+    if (NATIVE_SYMBOL && has(Symbol, name)) {
+      WellKnownSymbolsStore[name] = Symbol[name];
+    } else {
+      WellKnownSymbolsStore[name] = createWellKnownSymbol('Symbol.' + name);
+    }
   } return WellKnownSymbolsStore[name];
 };

tests/compat/tests.js

@@ -8,6 +8,24 @@ var NOT_WHITESPACES = '\u200B\u0085\u180E';
 
 var USERAGENT = GLOBAL.navigator && GLOBAL.navigator.userAgent || '';
 
+var process = GLOBAL.process;
+var v8 = process && process.versions && process.versions.v8 || '';
+
+var match, V8_VERSION;
+
+if (v8) {
+  match = v8.split('.');
+  V8_VERSION = +(match[0] + match[1]);
+} else if (USERAGENT) {
+  match = USERAGENT.match(/Edge\/(\d+)/);
+  if (!match || match[1] >= 74) {
+    match = USERAGENT.match(/Chrome\/(\d+)/);
+    if (match) V8_VERSION = +match[1];
+  }
+}
+
+var IS_NODE = Object.prototype.toString.call(process) == '[object process]';
+
 // eslint-disable-next-line unicorn/no-unsafe-regex -- safe
 var WEBKIT_STRING_PAD_BUG = /Version\/10\.\d+(\.\d+)?( Mobile\/\w+)? Safari\//.test(USERAGENT);
 
@@ -16,10 +34,6 @@ var DESCRIPTORS_SUPPORT = function () {
 };
 
 var PROMISES_SUPPORT = function () {
-  var process = GLOBAL.process;
-  var IS_NODE = Object.prototype.toString.call(process) == '[object process]';
-  var v8 = process && process.versions && process.versions.v8 || '';
-
   var promise = Promise.resolve(1);
   var empty = function () { /* empty */ };
   var FakePromise = (promise.constructor = {})[Symbol.species] = function (exec) {
@@ -28,12 +42,11 @@ var PROMISES_SUPPORT = function () {
 
   return (IS_NODE || typeof PromiseRejectionEvent == 'function')
     && promise.then(empty) instanceof FakePromise
-    && v8.indexOf('6.6') !== 0
-    && USERAGENT.indexOf('Chrome/66') === -1;
+    && V8_VERSION !== 66;
 };
 
 var SYMBOLS_SUPPORT = function () {
-  return String(Symbol());
+  return Symbol && (IS_NODE ? V8_VERSION !== 38 : V8_VERSION < 38 || V8_VERSION > 40);
 };
 
 var URL_AND_URL_SEARCH_PARAMS_SUPPORT = function () {