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avoid-unused-generics

added in: 1.4.0
warning
⚙️🛠
preset: recommended

Warns when a function or method declares unused generic types.

⚙️ Config​

Set ignore-overridden (default is false) to ignore methods that have the @override annotation.

dart_code_metrics:
  ...
  rules:
    ...
    - avoid-unused-generics:
        ignore-overridden: true

Example​

❌ Bad:

class SomeClass {
  // LINT
  String unused<T extends num>() {
    // ...
  }

  // LINT
  String multiple<T, U>(U param) {
    // ...
  }
}

// LINT
void function<T>() {
  return;
}

✅ Good:

class SomeClass {
  String used<T extends num>() {
    return (value as T).toString();
  }

  T multiple<T, U>(U param) {
    // ...
  }
}

void function() {
  return;
}