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

@@ -0,0 +1,19 @@
+'use strict';
+var global = require('../internals/global');
+var shared = require('../internals/shared');
+var hasOwn = require('../internals/has-own-property');
+var uid = require('../internals/uid');
+var NATIVE_SYMBOL = require('../internals/symbol-constructor-detection');
+var USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');
+
+var Symbol = global.Symbol;
+var WellKnownSymbolsStore = shared('wks');
+var createWellKnownSymbol = USE_SYMBOL_AS_UID ? Symbol['for'] || Symbol : Symbol && Symbol.withoutSetter || uid;
+
+module.exports = function (name) {
+  if (!hasOwn(WellKnownSymbolsStore, name)) {
+    WellKnownSymbolsStore[name] = NATIVE_SYMBOL && hasOwn(Symbol, name)
+      ? Symbol[name]
+      : createWellKnownSymbol('Symbol.' + name);
+  } return WellKnownSymbolsStore[name];
+};