Shouldn't `EXPORT_ES6` use only ES6 semantics?

The whole point of this construct is to allow bundlers to identify and package the needed extra files.

https://github.com/emscripten-core/emscripten/blob/054bf307ee8391ffea9037761e3c9e2bc54dcbbe/src/worker.js#L183

However if this is dependent on some extra variable, `webpack` will still choke on this file - as it won't be able to resolve the expression during bundling.

Is the manual override still needed when using ES6? And if yes, shouldn't there be a way to disable it?

This is the absolutely last remaining blocker for webpack to be able to bundle an emscripten-built JS loader that uses workers without any additional configuration. If the project does not use workers, it is already fully compatible.