avoid-unused-instances

added in: 1.8.0

warning

⚙️

Pro+

preset: recommended

Warns when a newly created object is not being used.

⚙️ Config

Set ignored-instances (default is [Timer, Debounce, Catcher]) to ignore instances that are intended to be unused.

dart_code_metrics:
  ...
  rules:
    ...
    - avoid-unused-instances:
        ignored-instances:
          - Timer
          - SomeOtherClass

Example

❌ Bad:

class SomeClass {
  ...
}

SomeClass function() {
  if (someCondition) {
    SomeClass(); // LINT
  }

  return SomeClass();
}

✅ Good:

class SomeClass {
  ...
}

SomeClass function() {
  if (someCondition) {
    return SomeClass();
  }

  return SomeClass();
}