src/Composer/Util/Filesystem.php
private function unlinkImplementation($path)
    {
        if (Platform::isWindows() && is_dir($path) && is_link($path)) {
            return rmdir($path);
        }

        return unlink($path);
    }
private function unlinkImplementation($path)
    {
        if (Platform::isWindows() && is_dir($path) && is_link($path)) {
            return rmdir($path);
        }

        return unlink($path);
    }
delete symbolic link implementation (commonly known as "unlink()")

symbolic links on windows which link to directories need rmdir instead of unlink

@param string $path

@return bool