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- 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/native-symbol-registry');
- 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;
- }
- });
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