25 lines
599 B
Plaintext
25 lines
599 B
Plaintext
'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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