This requires the 'enhanced-enums' language feature to be enabled

Issue

I just upgraded my Flutter SDK but I am still not able to use the enhanced-enums.

$ dart --version

prints

Dart SDK version: 2.18.0-109.0.dev

This is my code:

enum Foo {
  bar(0),
  baz(1),

  final int i;
  const Foo(this.i);
}

I get the following errors:

This requires the ‘enhanced-enums’ language feature to be enabled.

Expected to find ‘}’.

Solution

There are two problems here.

1. Update your Dart SDK version constraint in pubspec.yaml file to use the new Dart 2.17.0 version

   environment:
     sdk: ">=2.17.0 <3.0.0"
   

   Then run flutter pub get command

2. You must end your enum with a semicolon ; and not with a comma ,

   enum Foo {
     bar(0),
     baz(1); // <-- Replaced "," with ";"
   
     final int i;
     const Foo(this.i);
   }
   

Answered By – iDecode

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