empty_constructor_bodies

Use ; instead of {} for empty constructor bodies.

From Effective Dart:

DO use ; instead of {} for empty constructor bodies.

In Dart, a constructor with an empty body can be terminated with just a semicolon. This is required for const constructors. For consistency and brevity, other constructors should also do this.

BAD:

class Point {
  int x, y;
  Point(this.x, this.y) {}
}

GOOD:

class Point {
  int x, y;
  Point(this.x, this.y);
}

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

linter:
  rules:
    - empty_constructor_bodies

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

linter:
  rules:
    empty_constructor_bodies: true

Unless stated otherwise, the documentation on this site reflects Dart 3.7.0. Page last updated on 2025-01-27. View source or report an issue.