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21 lines
438 B
21 lines
438 B
'use strict'; |
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var callBound = require('call-bind/callBound'); |
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var $deref = callBound('WeakRef.prototype.deref', true); |
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module.exports = typeof WeakRef === 'undefined' |
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? function isWeakRef(value) { // eslint-disable-line no-unused-vars |
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return false; |
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} |
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: function isWeakRef(value) { |
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if (!value || typeof value !== 'object') { |
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return false; |
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} |
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try { |
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$deref(value); |
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return true; |
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} catch (e) { |
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return false; |
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} |
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};
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