avoid-unused-parameters

added in: 2.4.0

warning

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

caution

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

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);
}