main
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Last change
on this file since d24f17c was d24f17c, checked in by Aleksandar Panovski <apano77@…>, 15 months ago |
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Initial commit
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File size:
568 bytes
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| 1 | 'use strict';
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| 2 | var getBuiltIn = require('../internals/get-built-in');
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| 3 | var uncurryThis = require('../internals/function-uncurry-this');
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| 4 |
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| 5 | var Symbol = getBuiltIn('Symbol');
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| 6 | var keyFor = Symbol.keyFor;
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| 7 | var thisSymbolValue = uncurryThis(Symbol.prototype.valueOf);
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| 8 |
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| 9 | // `Symbol.isRegisteredSymbol` method
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| 10 | // https://tc39.es/proposal-symbol-predicates/#sec-symbol-isregisteredsymbol
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| 11 | module.exports = Symbol.isRegisteredSymbol || function isRegisteredSymbol(value) {
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| 12 | try {
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| 13 | return keyFor(thisSymbolValue(value)) !== undefined;
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| 14 | } catch (error) {
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| 15 | return false;
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| 16 | }
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| 17 | };
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