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var $ = require('../internals/export'); var hasOwn = require('../internals/has-own-property'); var isSymbol = require('../internals/is-symbol'); var tryToString = require('../internals/try-to-string'); var shared = require('../internals/shared'); var NATIVE_SYMBOL_REGISTRY = require('../internals/native-symbol-registry'); var SymbolToStringRegistry = shared('symbol-to-string-registry'); // `Symbol.keyFor` method // https://tc39.es/ecma262/#sec-symbol.keyfor $({ target: 'Symbol', stat: true, forced: !NATIVE_SYMBOL_REGISTRY }, { keyFor: function keyFor(sym) { if (!isSymbol(sym)) throw TypeError(tryToString(sym) + ' is not a symbol'); if (hasOwn(SymbolToStringRegistry, sym)) return SymbolToStringRegistry[sym]; } });