composer vendor-expose overwrite folder with broken synlink

[maxime-rainville]

Let's say you create a file under app/css/bob.css and update your project composer.json file like this:

{
"extra": {
        "expose": [
            "app/css"
        ]
    }
}

If you run a composer vendor-expose, bob.css and the css will be deleted and a new app/css symlink will be created. That symlink will point to a broken ../../../app/css location.

[maxime-rainville]

Setting impact as high because it destroy files.

[xini]

Confirming this on Windows. It seems that app/css is just deleted on Windows though.
On Mac and Ubuntu it seems to be working.

Update: an update to the latest composer version has fixed this for me.

[wilr]

@maxime-rainville I can confirm this still happens unfortunately! Updating to latest composer (1.8.6 doesn't help)

[b-rhodes]

I duplicated this as well, but only when there was an existing symlink to a containing folder.
In my case I changed from:

"expose": [
    "themes/base"
],

to this:

"expose": [
    "themes/base/build",
    "themes/base/images",
    "themes/base/icons",
    "themes/base/fonts"
],

To fix this, I manually removed the symlink to themes/bos, made the changes, then ran composer vendor-expose and it worked fine.