Support Multi-Case Switch Statements with the "Convert to switch expression" VScode code action

[verygoodstefan]

Note: I originally raised this issue in dart-code, and was directed to raise it here.

There's a neat code action to convert switch statements into expressions that take advantage of Dart 3's pattern matching:

Unfortunately, it does not work with switches with multiple cases giving the same return value:

It would be nice to be able to convert a multi-case switch like the following:

String myMultipleReturnEnumStatement(MyEnum enumVal) {
  switch (enumVal) {
    case MyEnum.first:
    case MyEnum.second:
    case MyEnum.third:
      return 'first, second, or third';
    case MyEnum.fourth:
    case MyEnum.fifth:
      return 'fourth or fifth';
    default:
      return 'default';
  }
}

into:

String myMultipleReturnEnumStatement(MyEnum enumVal) {
  return switch (enumVal) {
    MyEnum.first || MyEnum.second || MyEnum.third => 'first, second, or third',
    MyEnum.fourth || MyEnum.fifth => 'fourth or fifth',
    _ => 'default',
  };
}

I published a custom extension that supports this behavior, however, if it would be useful to enough people, it might be nice to have this behavior supported in the basic Dart VS code functionality.

• Dart version: 3.0.6
• Flutter SDK: 3.10.6

[bwilkerson]

That's very cool! And this is definitely the right issue tracker.

I'd love to see our support extended to cover this case, and I expect that it wouldn't be too difficult to do.