load method
Ensure that libraryName has been loaded.
If the library fails to load, the Future will complete with a DeferredLoadException.
Implementation
external Future<Null> load();© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-async/DeferredLibrary/load.html