In order to get out of this availability and compatibility problem, there are a couple of transpilers that you can use. Transpilers take your original ES8 code, and transform it into equivalent JS5 code. (It's a source-to-source transformation, instead of a source-to-object code as in compilation.) You can code using advanced ES8 features, but the user's browsers will receive JS5 code. A transpiler will also let you keep up with upcoming versions of the language, despite the time needed by browsers to adopt new standards across desktop and mobile devices.