Source

Library findLibraryFor(Element element) {
  // Maybe we were given an element we already saw, or an element for the
  // Library itself added by the constructor in [ModelElement.from].
  if (_elementToLibrary.containsKey(element)) {
    return _elementToLibrary[element];
  }
  Library foundLibrary;
  if (libraryElementReexportedBy.containsKey(element.library)) {
    Set<Library> exportedIn = libraryElementReexportedBy[element.library];
    foundLibrary = exportedIn.firstWhere(
        (l) =>
            l.element.location.components[0] ==
            element.library.location.components[0],
        orElse: () => null);
  }
  if (foundLibrary != null) _elementToLibrary[element] = foundLibrary;
  return foundLibrary;
}