Flutter project upgrade steps.md

Flutter project upgrade steps

To update the project to null safety follow these steps:

Side note: change the flutter version in pubsec.yaml, make new project and copy the following lines:

environment:
  sdk: ">=2.15.1 <3.0.0"

dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_lints: ^1.0.4

Then follow the steps:

• Run flutter upgrade in the terminal to upgrade Flutter
• Run dart migrate to run the dart migration tool.
• Solve all errors which the migration tool shows.
• Run flutter pub outdated --mode=null-safety to print all outdated packages.
• Run flutter pub upgrade --null-safety to upgrade all packages automatically.
• Check the code for errors and solve them (Very important).
• Run dart migrate again and it should now be successful. Follow the link to checkout the proposed changes.
• Press the Apply Migration button.
• Check the code for errors again and fix them.

Your project should be updated now. Referenced from this felixlarsen.