anchor.diff:        hasToCheckPackageUris = hasToCheckPackageUris || bypassCache;
         UriTranslator uriTranslator =
             await c.options.getUriTranslator(bypassCache: bypassCache);
  +      previousPackagesMap = currentPackagesMap;
  +      currentPackagesMap = uriTranslator.packages.asMap();
         ticker.logMs("Read packages file");
   
         if (dillLoadedData == null) {
  
positive.code:   final Component componentToInitializeFrom;
    bool initializedFromDill = false;
    Uri previousPackagesUri;
    bool hasToCheckPackageUris = false;
    Map<Uri, List<DiagnosticMessageFromJson>> remainingComponentProblems =
        new Map<Uri, List<DiagnosticMessageFromJson>>();
  
negative.code:       if (importUri != fileUri && invalidatedUris.contains(fileUri)) {
          return true;
        }
        if (hasToCheckPackageUris && importUri.scheme == "package") {
          // Get package name, check if the base URI has changed for the package,
          // if it has, translate the URI again,
          // otherwise the URI cannot have changed.
          String path = importUri.path;
          int firstSlash = path.indexOf('/');
          String packageName = path.substring(0, firstSlash);
          if (previousPackagesMap == null ||
              (previousPackagesMap[packageName] !=
                  currentPackagesMap[packageName])) {
            Uri newFileUri = uriTranslator.translate(importUri, false);
            if (newFileUri != fileUri) {
              return true;
            }
          }
        }
        if (builders[importUri]?.isSynthetic ?? false) return true;
        return false;
  