Validating a string starts with a substring

import 'package:luthor/luthor.dart';

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

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

part 'starts_with.freezed.dart';
part 'starts_with.g.dart';

@luthor
@freezed
abstract class StartsWithSchema with _$StartsWithSchema {
  const factory StartsWithSchema({
    @StartsWith('Hello') required String value,
  }) = _StartsWithSchema;

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

void main() {
  final result = $StartsWithSchemaValidate({'value': 'Hello World!'});

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