avoid-always-null-parameters

v1.33.0

warning

effort: 2m

has IDE fix

teams+

Warns when a private function or method has a parameter that always gets null.

Such parameters can be removed.

note

This rule handles only private declarations. For public functions and methods use the check-parameters command.

Example

❌ Bad:

class Some {
  void work() {
    _fn(null);
  }

  // LINT: This parameter always gets a null value. Try removing it.
  void _fn(String? nullable) {
    if (nullable == null) {
      // handle nullable case
    } else {
      // handle regular case
    }
  }
}

✅ Good:

class Some {
  void work() {
    _fn();
  }

  void _fn() {
    // handle nullable case
  }
}

Related Rules

• avoid-unnecessary-nullable-return-type
• avoid-unnecessary-nullable-fields
• avoid-nullable-parameters-with-default-values
• avoid-unnecessary-nullable-parameters