prefer_const_constructors_in_immutables

Prefer declaring const constructors on @immutable classes.

PREFER declaring const constructors on @immutable classes.

If a class is immutable, it is usually a good idea to make its constructor a const constructor.

BAD:

@immutable class A {  final a;  A(this.a); } 

GOOD:

@immutable class A {  final a;  const A(this.a); } 

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

linter:  rules:  - prefer_const_constructors_in_immutables 

If you're instead using the YAML map syntax to configure linter rules, add prefer_const_constructors_in_immutables: true under linter > rules:

linter:  rules:  prefer_const_constructors_in_immutables: true