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Viewing file:     index.js (801 B)      -rw-r--r--

'use strict';

var GetIntrinsic = require('get-intrinsic');
var callBound = require('call-bind/callBound');

var $WeakSet = GetIntrinsic('%WeakSet%', true);

var $setHas = callBound('WeakSet.prototype.has', true);

if ($setHas) {
	var $mapHas = callBound('WeakMap.prototype.has', true);

	module.exports = function isWeakSet(x) {
		if (!x || typeof x !== 'object') {
			return false;
		}
		try {
			$setHas(x, $setHas);
			if ($mapHas) {
				try {
					$mapHas(x, $mapHas);
				} catch (e) {
					return true;
				}
			}
			return x instanceof $WeakSet; // core-js workaround, pre-v3
		} catch (e) {}
		return false;
	};
} else {
	// eslint-disable-next-line no-unused-vars
	module.exports = function isWeakSet(x) {
		// `WeakSet` does not exist, or does not have a `has` method
		return false;
	};
}