avoid-nullable-interpolation

added in: 1.8.0

warning

⚙️

preset: recommended

Warns when an interpolation string contains a nullable value.

Consider checking the value to be non-null before using it in interpolation.

⚙️ Config

Set ignored-invocations (default is none) to ignore interpolation strings within specific invocations.

dart_code_metrics:
  ...
  rules:
    ...
    - avoid-nullable-interpolation:
        ignored-invocations:
          - log
          - debugPrint

Example

❌ Bad:

void function(String? value) {
  print('$value hello'); // LINT
}

✅ Good:

void function(String? value) {
  if (value != null) {
    print('$value hello');
  }

  print('${value != null ? value : ''} hello');
}