avoid-unnecessary-constructor

v1.22.0

style

has auto-fix

pro+

Suggests removing an unnecessary empty constructor for enum and class declarations.

In Dart, classes and enums always have an implicit default constructor and declaring it explicitly is usually unnecessary.

Example

❌ Bad:

class SomeClass {
  final values = <int>{};

  // LINT: This constructor is unnecessary. Try removing it.
  SomeClass();
}

enum MyEnum {
  alpha,
  beta,
  gama;
  
  // LINT: This constructor is unnecessary. Try removing it.
  const MyEnum();
}

✅ Good:

class SomeClass {
  final values = <int>{};
}

enum MyEnum {
  alpha,
  beta,
  gama;
}

Related Rules

• prefer-declaring-const-constructor