The babel documentation says it&#x27;s a bad idea to do this in production, so I&#x27;m thinking of using webpack to transpile then entire back-end to one ES5 file. Do you know enough about this situation to tell me if this is a bad idea or not? Because obviously your approach would be &#x27;simpler&#x27;.<p>Edit: An additional reason to transpile to ES5 is that on the whole much of the ES6 support is not very performant yet. While this might not matter for incidental uses of, say, template strings, it might become noticeable for an entire project. Or is that a clear case of premature optimization?