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'use strict'; var GetIntrinsic = require('get-intrinsic'); var callBound = require('call-bound'); var $WeakSet = GetIntrinsic('%WeakSet%', true); /** @type {undefined | (<V>(thisArg: Set<V>, value: V) => boolean)} */ var $setHas = callBound('WeakSet.prototype.has', true); if ($setHas) { /** @type {undefined | (<K extends object, V>(thisArg: WeakMap<K, V>, key: K) => boolean)} */ var $mapHas = callBound('WeakMap.prototype.has', true); /** @type {import('.')} */ module.exports = function isWeakSet(x) { if (!x || typeof x !== 'object') { return false; } try { // @ts-expect-error TS can't figure out that $setHas is always truthy here $setHas(x, $setHas); if ($mapHas) { try { // @ts-expect-error this indeed might not be a weak collection $mapHas(x, $mapHas); } catch (e) { return true; } } // @ts-expect-error TS can't figure out that $WeakSet is always truthy here return x instanceof $WeakSet; // core-js workaround, pre-v3 } catch (e) {} return false; }; } else { /** @type {import('.')} */ // @ts-expect-error module.exports = function isWeakSet(x) { // eslint-disable-line no-unused-vars // `WeakSet` does not exist, or does not have a `has` method return false; }; }
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