source: imaps-frontend/node_modules/is-weakset/index.js@ 79a0317

'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;
        };
}