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avoid-unnecessary-negations

added in: 1.4.0
style
🛠
Pro+
preset: recommended

Warns when a negation can be simplified.

Example​

❌ Bad:

void main() {
  final someCondition = true;

  if (!!someCondition) {} // LINT: Avoid unnecessary negations. Try rewriting the code without it.

  if (!true) {} // LINT: Avoid unnecessary negations. Try rewriting the code without it.

  // LINT: Avoid unnecessary negations on each side of this binary expression. Try removing them.
  if (!flag == !another) {}

  // LINT: Avoid unnecessary negations on each side of this binary expression. Try removing them.
  if (!flag != !another) {}
}

✅ Good:

void main() {
  final someCondition = true;

  if (someCondition) {} // Correct, uses 'someCondition' directly

  if (false) {} // Correct, uses 'false' instead

  if (flag == another) {}
}