prefer_const_declarations

Prefer const over final for declarations.

This rule is available as of Dart 2.0.0.

Rule sets: flutter

This rule has a quick fix available.

Details

PREFER using const for const declarations.

Const declarations are more hot-reload friendly and allow to use const constructors if an instantiation references this declaration.

BAD:

final o = const <int>[];

class A {
  static final o = const <int>[];
}

GOOD:

const o = <int>[];

class A {
  static const o = <int>[];
}

To enable the prefer_const_declarations rule, add prefer_const_declarations under linter > rules in your analysis_options.yaml file:

linter:
  rules:
    - prefer_const_declarations