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24 lines
599 B
24 lines
599 B
'use strict'; |
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var callBound = require('call-bound'); |
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// eslint-disable-next-line no-extra-parens |
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var $deref = /** @type {<T extends WeakKey>(thisArg: WeakRef<T>) => T | undefined} */ (callBound('WeakRef.prototype.deref', true)); |
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/** @type {import('.')} */ |
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module.exports = typeof WeakRef === 'undefined' |
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? function isWeakRef(_value) { // eslint-disable-line no-unused-vars |
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return false; |
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} |
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: function isWeakRef(value) { |
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if (!value || typeof value !== 'object') { |
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return false; |
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} |
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try { |
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// @ts-expect-error |
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$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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