Make a value Required / Non-nullable

To make a value required, you can use the required modifier. This will ensure that the value is not null.

import 'package:luthor/luthor.dart';

void main() {
  final validator = l.string().required();
  print(validator.validateValue('Hello'));
}

Note: When using code generation, using the required keyword in the Freezed class will make the value required automatically.

import 'package:luthor/luthor.dart';
import 'package:freezed_annotation/freezed_annotation.dart';

part 'required_schema.freezed.dart';
part 'required_schema.g.dart';

@luthor
@freezed
abstract class RequiredSchema with _$RequiredSchema {
  const factory RequiredSchema({
    // Adds the required modifier to the value
    required String value,
  }) = _RequiredSchema;

  factory RequiredSchema.fromJson(Map<String, dynamic> json) =>
      _$RequiredSchemaFromJson(json);
}

void main() {
  final result = $RequiredSchemaValidate({'value': 'Hello'});

  switch (result) {
    case SchemaValidationSuccess(data: final data):
      print('✅ Valid: ${data.value}');
    case SchemaValidationError(errors: final errors):
      print('❌ Errors: $errors');
  }
}