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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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