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20 lines
614 B
20 lines
614 B
'use strict'; |
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module.exports = function () { |
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var weakMap, x; |
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if (typeof WeakMap !== 'function') return false; |
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try { |
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// WebKit doesn't support arguments and crashes |
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weakMap = new WeakMap([[x = {}, 'one'], [{}, 'two'], [{}, 'three']]); |
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} catch (e) { |
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return false; |
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} |
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if (String(weakMap) !== '[object WeakMap]') return false; |
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if (typeof weakMap.set !== 'function') return false; |
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if (weakMap.set({}, 1) !== weakMap) return false; |
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if (typeof weakMap.delete !== 'function') return false; |
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if (typeof weakMap.has !== 'function') return false; |
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if (weakMap.get(x) !== 'one') return false; |
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return true; |
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};
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