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avoid-nested-conditional-expressions

added in: 1.6.0
style
⚙️
Pro+

Suggests to refactor conditional expressions when the nesting level exceeds the configured threshold.

⚙️ Config​

Set acceptable-level (default is 1) to configure the acceptable nesting level.

analysis_options.yaml
dart_code_metrics:
  rules:
    - avoid-nested-conditional-expressions:
        acceptable-level: 1

Example​

❌ Bad:

final str = '';

final twoLevels = str.isEmpty
    ? str.isEmpty // LINT: Avoid nested conditional expressions. Try rewriting the code to remove nesting.
        ? 'hi'
        : '1'
    : '2';

final threeLevels = str.isEmpty
    ? str.isEmpty // LINT: Avoid nested conditional expressions. Try rewriting the code to remove nesting.
        ? str.isEmpty // LINT: Avoid nested conditional expressions. Try rewriting the code to remove nesting.
            ? 'hi'
            : '1'
        : '2'
    : '3';

✅ Good:

final oneLevel = str.isEmpty ? 'hi' : '1'; // Correct, only one level (as configured)

final twoLevels = _getStr(str);

String _getStr(String str) {
    if (str.isEmpty) {
        return 'hi';
    }

    ...
}