Revert "Various clean-ups and null-safety improvements. (#140)" (#152)

This reverts commit 05b9553c81b0168e7665d47730977ca289334a69.

Since this has not been published or rolled through to the SDK or
Flutter we will hold it back to reduce risk.
8 files changed
tree: 29b6f625d6652971c884c37e50e73781026273bd
  1. .github/
  2. .gitignore
  3. AUTHORS
  4. CHANGELOG.md
  5. CONTRIBUTING.md
  6. LICENSE
  7. README.md
  8. analysis_options.yaml
  9. lib/
  10. pubspec.yaml
  11. test/
README.md

Contains utility classes in the style of dart:async to work with asynchronous computations.