no-boolean-literal-compare

added in: 1.5.0

style

⚙️🛠

Free+

Warns on comparison to a boolean literal, as in x == true. Comparing boolean values to boolean literals is unnecessary, as those expressions will result in booleans too. Just use the boolean values directly or negate them.

⚙️ Config

Set allow-false (default is false) to allow value == false or false == value checks.

dart_code_metrics:
  ...
  rules:
    ...
    - no-boolean-literal-compare:
        allow-false: true

Example

❌ Bad:

  var b = x == true; // LINT
  var c = x != true; // LINT

   // LINT
  if (x == true) {
    ...
  }

   // LINT
  if (x != false) {
    ...
  }

✅ Good:

  var b = x;
  var c = !x;

  if (x) {
    ...
  }

  if (!x) {
    ...
  }