# new Validator()

Abstract class for defining synchronous validators.

See:

• BaseValidator For the base validator.
• ValidatorOptions For the base validator options.

View Source validation/Validators/Validator.ts, line 45

Example

```typescript
// Example of a synchronous validator that checks if a number is greater than
class GreaterThanValidator extends Validator<{ gt?: number }> {
  constructor(message: string = "Value must be greater than {0}") {
    super(message);
  }

  hasErrors(value: number, options?: { gt?: number }) {
    const minValue = options?.gt ?? 0;
    if (value <= minValue) {
      return this.getMessage();
    }
    return undefined;
  }
}

// Example usage:
const validator = new GreaterThanValidator();
const error = validator.hasErrors(10, { gt: 15 });
if (error) {
  console.log('Value must be greater than 15')
} else {
  console.log('Value is valid');
}
```

- If `value` is less than or equal to `gt`, returns the error message.
- Otherwise, returns `undefined` indicating validation success.