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17 lines
474 B
17 lines
474 B
'use strict'; |
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var validTypes = { object: true, symbol: true }; |
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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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// Return 'true' also for polyfills |
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if (!validTypes[typeof Symbol.iterator]) return false; |
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if (!validTypes[typeof Symbol.toPrimitive]) return false; |
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if (!validTypes[typeof Symbol.toStringTag]) return false; |
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return true; |
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};
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