.notUndefined

The .notUndefined rule is used to ensure that the value of a given property is not undefined.

note

Note that this rule considers null values to be valid. If you need to disallow both null and undefined values (or just null values), you may use the .notNull rule instead.

Example

import { Validator } from 'fluentvalidation-ts';

type FormModel = {
  customerId?: number | null;
};

class FormValidator extends Validator<FormModel> {
  constructor() {
    super();

    this.ruleFor('customerId').notUndefined();
  }
}

const formValidator = new FormValidator();

formValidator.validate({ customerId: 100 });
// ✔ {}

formValidator.validate({ customerId: null });
// ✔ {}

formValidator.validate({});
// ❌ { customerId: 'Value cannot be undefined' }

formValidator.validate({ customerId: undefined });
// ❌ { customerId: 'Value cannot be undefined' }

Reference

.notUndefined()

A validation rule which ensures that the given property is not undefined.

Example Message

Value cannot be undefined