prefer_const_constructors

Prefer const with constant constructors.

PREFER using const for instantiating constant constructors.

If a constructor can be invoked as const to produce a canonicalized instance, it's preferable to do so.

BAD:

class A {  const A(); } ​ void accessA() {  A a = new A(); } 

GOOD:

class A {  const A(); } ​ void accessA() {  A a = const A(); } 

GOOD:

class A {  final int x; ​  const A(this.x); } ​ A foo(int x) => new A(x); 

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

linter:  rules:  - prefer_const_constructors 

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

linter:  rules:  prefer_const_constructors: true