Validating a string contains a substring

import 'package:luthor/luthor.dart';

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

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

part 'contains.freezed.dart';
part 'contains.g.dart';

@freezed
@luthor
class ContainsSchema extends _$ContainsSchema {
  const factory ContainsSchema({
    required String value,
  }) = _$ContainsSchema;

  static SchemaValidationResult<ContainsSchema> validate(
    Map<String, dynamic> json,
  ) =>
      _$ContainsSchemaValidate(json);

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

void main() {
  print(ContainsSchema.validate({'value': 'Hello World!'}));
}