| 1 | 'use strict';
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| 2 | var $ = require('../internals/export');
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| 3 | var hasOwn = require('../internals/has-own-property');
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| 4 | var isSymbol = require('../internals/is-symbol');
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| 5 | var tryToString = require('../internals/try-to-string');
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| 6 | var shared = require('../internals/shared');
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| 7 | var NATIVE_SYMBOL_REGISTRY = require('../internals/symbol-registry-detection');
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| 8 |
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| 9 | var SymbolToStringRegistry = shared('symbol-to-string-registry');
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| 10 |
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| 11 |
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| 12 |
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| 13 | $({ target: 'Symbol', stat: true, forced: !NATIVE_SYMBOL_REGISTRY }, {
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| 14 | keyFor: function keyFor(sym) {
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| 15 | if (!isSymbol(sym)) throw new TypeError(tryToString(sym) + ' is not a symbol');
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| 16 | if (hasOwn(SymbolToStringRegistry, sym)) return SymbolToStringRegistry[sym];
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| 17 | }
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| 18 | });
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