Flutter v1.22.0からv2.2.0に上げた時の修正メモ

$ .fvm/flutter_sdk/bin/dart pub outedated --null-safety

$ .fvm/flutter_sdk/bin/dart migrate

See https://dart.dev/go/null-safety-migration for a migration guide.

Analyzing project...

Bad state: Error: package has unmigrated dependencies.

Before migrating your package, we recommend ensuring that every library it
imports (either directly or indirectly) has been migrated to null safety, so
that you will be able to run your unit tests in sound null checking mode.  You
are currently importing the following non-null-safe libraries:

  package:sputnik/config/app_config.dart
  ...
  package:sputnik/utils/string_to_base64.dart

Please upgrade the packages containing these libraries to null safe versions
before continuing.  To see what null safe package versions are available, run
the following command: `dart pub outdated --mode=null-safety`.

To skip this check and try to migrate anyway, re-run with the flag
`--skip-import-check`.

$ .fvm/flutter_sdk/bin/dart migrate --skip-import-check`

...
error • The argument type 'String' can't be assigned to the parameter type 'Request' at test/repositories/kitty_repository_test.dart:364:60 • (argument_type_not_assignable)

The migration tool didn't start, due to analysis errors.

The following steps might fix your problem:
1. Run `dart pub get`.
2. Try running `dart migrate` again.

$  .fvm/flutter_sdk/bin/dart migrate --help                             
Perform a null safety migration on a project or package.

Usage: dart migrate [arguments] [project or directory]
-h, --help                       Print this usage information.
-v, --verbose                    Show additional command output.
    --apply-changes              Apply the proposed null safety changes to the files on disk.
    --ignore-errors              Attempt to perform null safety analysis even if the package has analysis errors.
    --skip-import-check          Go ahead with migration even if some imported files have not yet been migrated.

$  .fvm/flutter_sdk/bin/dart migrate --skip-import-check --ignore-errors

$  .fvm/flutter_sdk/bin/dart migrate --skip-import-check --ignore-errors --ignore-exceptions
...
Compiling instrumentation information...
[--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------]

Your pubspec has been updated.  Please run `dart pub get`.
View the migration suggestions by visiting:

  http://127.0.0.1:62067/home/sputnik?authToken=hoge

Use this interactive web view to review, improve, or apply the results.
When finished with the preview, hit ctrl-c to terminate this process.

If you make edits outside of the web view (in your IDE), use the 'Rerun from
sources' action.

class Hoge {
  Hoge({
-   @required foo
+   required foo
  })
}

$ fvm flutter pub run build_runner build --delete-conflicting-outputs

Failed to precompile build_runner:build_runner:
../../.pub-cache/hosted/pub.dartlang.org/analyzer-1.6.0/lib/src/error/best_practices_verifier.dart:1600:40: Error: Getter not found: 'topLevelVariable'.
      return kinds.contains(TargetKind.topLevelVariable);
                                       ^^^^^^^^^^^^^^^^

dev_dependencies:
  analyzer: ^1.7.1

class Todos with _$Todos {
  // Required for adding a custom field.
  Todos._();
  factory Todos(List<Todo> todos) = _Todos;
- @late
- List<Todo> get completed => todos.where((t) => t.completed).toList();
+ late final List<Todo> completed = todos.where((t) => t.completed).toList();
}
// freezedのドキュメントより抜粋・編集

- abstract class Todos with _$Todos {
+ class Todos with _$Todos {
  ...
}

- factory Todo.fromJson(Map<String, Object> json) { ...
+ factory Todo.fromJson(Map<String, Object?> json) { ...

factory Todo.fromJson(Map<String, Object?> json) {
  title: json['title'] ?? 'no title' 
}

// もしくは以下のような..

factory Todo.fromJson(Map<String, Object?> json) {
  title: json['title'] == null ? 'no title' : json['title']
}

factory Todo.fromJson(Map<String, Object?> json) {
  title: json['title'] as String
}

flutter: Caught error type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'Map<String, Object>'

$ pod install
...
Specs satisfying the `firebase_analytics (from `.symlinks/plugins/firebase_analytics/ios`)` dependency were found, but they required a higher minimum deployment target.

- platform :ios, '9.0'
+ platform :ios, '10.0'

$ pod install
...
None of your spec sources contain a spec satisfying the dependency: `Firebase/CoreOnly (= 8.0.0)`.
You have either:
 * out-of-date source repos which you can update with `pod repo update` or with `pod install --repo-update`.
 * mistyped the name or version.
 * not added the source repo that hosts the Podspec to your Podfile.

$ pod repo update
...
Updating spec repo `trunk`.

$ pod install
...
Pod installation complete! There are 19 dependencies from the Podfile and 34 total pods installed.

FlatButton(
  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(30)),
  color: Colors.red,
  child: ...
)

TextButton(
  style: TextButton.styleFrom(
    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(30)),
    backgroundColor: Colors.red,
  ),
  child: ...
)

TextButton(
  style: ButtonStyle(
    backgroundColor:MaterialStateProperty.resolveWith<Color>(
      (Set<MaterialState> states) {
        if (states.contains(MaterialState.disabled)) {
          return SputnikColors.lightGrey;
        }
        return null; // disabled以外のケースだとTextButtonのデフォルトの値が返る
      }),
    )
  )
  child: ...
)