avoid_unused_constructor_parameters

Avoid defining unused parameters in constructors.

AVOID defining unused parameters in constructors.

BAD:

class BadOne {
  BadOne(int unusedParameter, [String unusedPositional]);
}

class BadTwo {
  int c;

  BadTwo(int a, int b, int x) {
    c = a + b;
  }
}

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

linter:
  rules:
    - avoid_unused_constructor_parameters

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

linter:
  rules:
    avoid_unused_constructor_parameters: true

Unless stated otherwise, the documentation on this site reflects Dart 3.6.0. Page last updated on 2025-01-27. View source or report an issue.