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