avoid-unused-parameters

added in: 1.6.0

warning

⚙️🛠

preset: recommended

Checks for unused parameters inside a function or method body. For overridden methods suggests renaming unused parameters to _, __, etc.

warning

Abstract classes are completely ignored by the rule to avoid redundant checks for potentially overridden methods.

⚙️ Config

Set ignore-inline-functions (default is true) to ignore inline functions. Default value is set to true for backward compatibility and can be changed in the future.

dart_code_metrics:
  ...
  rules:
    ...
    - avoid-unused-parameters:
        ignore-inline-functions: false

Example

❌ Bad:

void someFunction(String s) { // LINT
  return;
}

class SomeClass {
  void method(String s) { // LINT
    return;
  }
}

class SomeClass extends AnotherClass {
  @override
  void method(String s) {} // LINT
}

✅ Good:

void someOtherFunction() {
  return;
}

class SomeOtherClass {
  void method() {
    return;
  }
}

void someOtherFunction(String s) {
  print(s);
  return;
}

class SomeOtherClass {
  void method(String s) {
    print(s);
    return;
  }
}

class SomeOtherClass extends AnotherClass {
  @override
  void method(String _) {}
}

abstract class SomeOtherClass {
  void method(String s);
}