Arrow functions should be used only for callbacks. I hate that people has started defining named functions with arrow functions in JS. Arrow functions are not hoisted and the ordering of your functions is going to get wonky, because you need to define all you functions first before composing them, when it should be the other way around. Start with the most high-level function which calls lower level functions.
Why do you feel it’s terrible? I did Java in VSCode for my previous job and I thought it was pretty decent.