index.js

/**
 * @description Simple polyfill for WeakRef
 * @author Jaenster
 */
(function (global) {
	if (typeof global === 'object' && global && typeof global['WeakRef'] === 'undefined') {

		global.WeakRef = (function (wm) {
			function WeakRef(target) {
				wm.set(this, target);
			}

			WeakRef.prototype.deref = function () {
				return wm.get(this);
			};

			return WeakRef;
		})(new WeakMap());
	}
})((function () {
	switch (true) {
		case typeof globalThis === 'object' && !!globalThis:
			return globalThis;
		case typeof self === 'object' && !!self:
			return self;
		case typeof window === 'object' && !!window:
			return window;
		case typeof global === 'object' && !!global:
			return global;
		case typeof Function === 'function':
			return (Function('return this')());
	}
	return null;
})());