You're correct that there is a difference between execution environments between the JVM and Js. However, in practice you're very unlikely to run into them. My

You're correct that there is a difference between execution environments between the JVM and Js. However, in practice you're very unlikely to run into them. My team has been heavily relying on cross-compilation for about three years now. We have yet to run into a scenario where this kind of problems actually came up.