Unsupported syntax in files that are not target files - export { Foo as Bar } from "..."

[Viktor Luft]

When using export { Foo as Bar } from "..." and then re-exporting "Bar" from a target file, then "Foo" will be tree-shaken even if "Bar" is used.

When changing this:

export { Foo as Bar } from "...";

to that

import { Foo as Bar } from "...";
export { Bar };

then it works all fine.

[n028]

Thanks for reporting! Could you by any chance provide a minimal repro?
I may need a small clarification, especially around that part of your description:

then "Foo" will be tree-shaken even if "Bar" is used

I've just set up a documented example to illustrate how I actually understood your issue's description, it may help you understand where's the confusing part for me.

[Viktor Luft]

From what you created, you got the idea right, but I can see that in your repro it works. I will try to figure out the difference to my project setup that might be missing here.

Update: I found the difference. Will try to narrow it down even further now.

[Viktor Luft]

I've created a PR with an example that demonstrates the issue: #32

[n028]

Thank's a lot, I'll take a look this week-end!

[n028]

@fdc-viktor-luft just to keep you posted, I did not forget about this and I've already fixed the issue on my side; but I'm also working on several other issues/features I'd like to deploy at once. Unfortunately I didn't have much spare time lately, please let me know if this can still wait a bit on your side. I may still deploy a dedicated patch if this takes too much time

Thanks again for digging the differences between our two cases, it was definitely helpful!

[Chintu Mohandas]

I'm not sure if this is the same issue, but i get error when there is an aliased import in a file and that file has a declaration which has the same name as the original import.
Example:

import {Flyout as FlyoutBase} from '@monorepo/package-one';

export const Flyout = () => {
   return <FlyoutBase />
}

The code throws error Duplicate identifier Flyout :(