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avoid-duplicate-map-keys

added in: 1.13.0
warning
🛠
preset: recommended

Warns when a map has duplicate keys.

Example​

❌ Bad:

void fn() {
  final map = {
    'key': 'value',
    'key': 'value', // LINT
    ...{'key': 'value'}, // LINT
    if (...) 'key': 'value', // LINT
  };

  final override = {
    if (...) 'key': 'value',
    'key': 'value', // LINT
  };
}

✅ Good:

void fn() {
  final map = {
    'key': 'value',
    'anotherKey': 'value',
    ...{'key': 'anotherValue'},
  };

  final override = {
    'key': 'value',
  };
}