avoid-unassigned-late-fields

v1.6.0

warning

effort: 4m

recommended

starter+

Warns when a private 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';

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

✅ Good:

class Test {
  late final field; // Correct, public

  late int _anotherField; // Correct, assigned

  final String regular; // Correct, not late

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

Additional Resources

• CWE-457: Use of Uninitialized Variable

Related Rules

• avoid-unassigned-fields
• avoid-late-keyword
• avoid-unnecessary-local-late
• avoid-late-context