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19 lines
599 B
19 lines
599 B
10 years ago
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'use strict';
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module.exports = function () {
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var symbol;
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if (typeof Symbol !== 'function') return false;
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symbol = Symbol('test symbol');
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try { String(symbol); } catch (e) { return false; }
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if (typeof Symbol.iterator === 'symbol') return true;
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// Return 'true' for polyfills
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if (typeof Symbol.isConcatSpreadable !== 'object') return false;
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if (typeof Symbol.iterator !== 'object') return false;
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if (typeof Symbol.toPrimitive !== 'object') return false;
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if (typeof Symbol.toStringTag !== 'object') return false;
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if (typeof Symbol.unscopables !== 'object') return false;
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return true;
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};
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