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node_modules/core-js/modules/es.symbol.for.js

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+'use strict';
+var $ = require('../internals/export');
+var getBuiltIn = require('../internals/get-built-in');
+var hasOwn = require('../internals/has-own-property');
+var toString = require('../internals/to-string');
+var shared = require('../internals/shared');
+var NATIVE_SYMBOL_REGISTRY = require('../internals/symbol-registry-detection');
+
+var StringToSymbolRegistry = shared('string-to-symbol-registry');
+var SymbolToStringRegistry = shared('symbol-to-string-registry');
+
+// `Symbol.for` method
+// https://tc39.es/ecma262/#sec-symbol.for
+$({ target: 'Symbol', stat: true, forced: !NATIVE_SYMBOL_REGISTRY }, {
+  'for': function (key) {
+    var string = toString(key);
+    if (hasOwn(StringToSymbolRegistry, string)) return StringToSymbolRegistry[string];
+    var symbol = getBuiltIn('Symbol')(string);
+    StringToSymbolRegistry[string] = symbol;
+    SymbolToStringRegistry[symbol] = string;
+    return symbol;
+  }
+});