Why do you need this pattern with modern JS and modules? ES6 Modules are singletons - the instance is created when module is loaded. Just instantiate the class within a module and export it. https://k94n.com/es6-modules-single-instance-pattern
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Thoughts on software development. Author of “PrimeFaces Cookbook” and “Angular UI Development with PrimeNG”. My old blog: http://ovaraksin.blogspot.de
