partialCheck

Creates a partial check validation action.

const Action = v.partialCheck<TInput, TPaths, TSelection, TMessage>(
  paths,
  requirement,
  message
);

Generics

• TInput extends Record<string, unknown> | ArrayLike<unknown>
• TPaths extends RequiredPaths
• TSelection extends DeepPickN<TInput, TPaths>
• TMessage extends ErrorMessage<PartialCheckIssue<TSelection>> | undefined

Parameters

• paths ValidPaths<TInput, TPaths>
• requirement (input: TSelection) => boolean
• message TMessage

Explanation

With partialCheck you can freely validate the selected input and return true if it is valid or false otherwise. If the input does not match your requirement, you can use message to customize the error message.

The difference to check is that partialCheck can be executed whenever the selected part of the data is valid, while check is executed only when the entire dataset is typed. This can be an important advantage when working with forms.

Returns

• Action PartialCheckAction<TInput, TPaths, TSelection, TMessage>

Examples

The following examples show how partialCheck can be used.

Register schema

Schema that ensures that the two passwords match.

const RegisterSchema = v.pipe(
  v.object({
    email: v.pipe(
      v.string(),
      v.nonEmpty('Please enter your email.'),
      v.email('The email address is badly formatted.')
    ),
    password1: v.pipe(
      v.string(),
      v.nonEmpty('Please enter your password.'),
      v.minLength(8, 'Your password must have 8 characters or more.')
    ),
    password2: v.string(),
  }),
  v.forward(
    v.partialCheck(
      [['password1'], ['password2']],
      (input) => input.password1 === input.password2,
      'The two passwords do not match.'
    ),
    ['password2']
  )
);

Related

The following APIs can be combined with partialCheck.

Schemas

any, array, custom, instance, intersect, lazy, looseObject, looseTuple, nonNullable, nonNullish, nonOptional, object, objectWithRest, record, strictObject, strictTuple, tuple, tupleWithRest, union, variant

Methods

forward, pipe

Utils

isOfKind, isOfType