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avoid-unassigned-late-fields

added in: 1.6.0
warning
Pro+
preset: recommended

Warns when a late field is not assigned a value.

Using late fields that have not received a value will result in runtime exceptions and should be avoided.

Example​

❌ Bad:

class Test {
  late final field = 'string';

  late int uninitializedField; // LINT: This field is never assigned a value. Try assigning a value to it or removing the 'late' keyword.

  late int _privateLate; // LINT: This field is never assigned a value. Try assigning a value to it or removing the 'late' keyword.
}

✅ Good:

class Test {
  late final field = 'string';

  late int anotherField; // Correct, assigned

  final String regular; // Correct, not late

  Test(this.regular) : anotherField = 1;
}

Known Limitations​

This rule checks assignments to late fields only in the declaration file.

Additional Resources​