source: imaps-frontend/node_modules/is-weakref/index.js

'use strict';

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

var $deref = callBound('WeakRef.prototype.deref', true);

module.exports = typeof WeakRef === 'undefined'
        ? function isWeakRef(value) { // eslint-disable-line no-unused-vars
                return false;
        }
        : function isWeakRef(value) {
                if (!value || typeof value !== 'object') {
                        return false;
                }
                try {
                        $deref(value);
                        return true;
                } catch (e) {
                        return false;
                }
        };