avoid-negated-conditions

added in: 1.7.0

style

⚙️🛠

Warns when an if statement or conditional expression have a negated condition that can be inverted.

⚙️ Config

Set ignore-null-checks (default is false) to exclude null checks.

dart_code_metrics:
  ...
  rules:
    ...
    - avoid-negated-conditions:
        ignore-null-checks: true

Example

❌ Bad:

// LINT
if (!flag) {
  ...
} else {
  ...
}

// LINT
if (flag is! bool) {
  ...
} else {
  ...
}

final newValue = !flag ? value - 1 : value + 1; // LINT

✅ Good:

if (flag) {
  ...
} else {
  ...
}

if (flag is bool) {
  ...
} else {
  ...
}

final newValue = flag ? value + 1 : value - 1;