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