This repository demonstrate add-to-app feature of Flutter.
Since the feature is still pre-released status at the time of publish of this repository, app in this repository may not work with the future version of dev tools. Here's flutter doctor output under environment that this repository works.
$ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel master, v1.8.4-pre.67, on Mac OS X 10.14.5 18F132, locale ja-JP)
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 10.3)
[✓] Android Studio (version 3.4)
[✓] VS Code (version 1.36.1)
[✓] Connected device (2 available)
• No issues found!