relativePackageUri function
Returns the package URI root path relative to the package root directory.
Implementation
String relativePackageUri(Package package) {
final rootPath = package.root.toFilePath();
final packageUriRootPath = package.packageUriRoot.toFilePath();
final relative = p.relative(packageUriRootPath, from: rootPath);
return p.normalize(relative).endsWith(p.separator)
? p.normalize(relative)
: '${p.normalize(relative)}${p.separator}';
}