Allow errorMap (like zod) message for literal about valibot HOT 11 CLOSED

Oh, I'm sorry, I just found that you can use v.variant('field', [Schema1, Schema2], 'Message') that's what I want. I'm sorry for the misunderstood.

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We support advanced errors too but they work a bit differently. Have a look at this guide: https://valibot.dev/guides/internationalization/

import * as v from 'valibot';

v.setGlobalMessage((issue) => ...);

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Please reach out if you can’t achieve your goal. I am happy to further improve the library.

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It's not the solution that I was looking for, because I would like to change the message for each case (if I have more), like "You need to choose a country" and in other cases "You need to choose a nationality". I would like to see an option to customize that message for the specific field.
Something like:

const PTFormSchema = v.object({
  codConcelho: v.string([v.minLength(1, 'required.county')]),
  codPais: v.literal('PT', 'required.country', {errorMap: () => 'My message'}), // It could be other format, like a cusom method ([v.errorMap(() => 'My message')])
  codigoPostal2: v.string([v.minLength(1, 'required.postalCode')]),
  concelhoEstrangeiro: v.unknown(),
});

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I did not quite understand your use case. Why don't you use pass the message as a string, or define it globally a pass its variable. Another option would be to use an i18n library like Paraglide JS. Your code does not look secure to me. If you change a key, you never know if your code is broken. There is no secure mapping between an error map and the specified keys.

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Well, I'm using react-hook-forms and valibot to validate, then, I'm using react-i18next to translate the error messages. For each literal I would like to have an option to configure an error message in case of the value don't match that specific literal.

For now, what I'm doing is this, but it would be nice to change this string created by valibot:

{
  "Invalid type: Expected \"PT\" | string but received \"\"": "O campo é obrigatório",
  "Invalid type: Expected true | false but received \"\"": "O campo é obrigatório"
}

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If you only support one language I would not do the overhead of using an i18n library and just pass the error message directly to Valibot. If it is necessary to support multiple languages I would have a look at Paraglide JS and pass the error message as described here directly to Valibot.

Valibot is still in active development. I am happy to receive feedback to further improve custom error messages before we reach v1 in the next weeks.

import * as v from 'valibot';

// Option 1 (similar to an error map)
const messages = {
  'required.county': 'Your message',
  // ...
};
const Schema = v.object({
  codConcelho: v.string([v.minLength(1, messages['required.county'])]),
  // ...
});

// Option 2 (better for tree shaking)
const REQUIRED_COUNTRY = 'Your message';
const Schema = v.object({
  codConcelho: v.string([v.minLength(1, REQUIRED_COUNTRY)]),
  // ...
});

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I need support for multiple languages and since we are using react-i18next already, we can't change.
I would like to just have an option to configure a message (directly on the literal) in case of the value is other than the expected.

Imagine literal(false) and receive '', instead of the default Invalid type: Expected false but received \"\", valibot could use the message that I define.

It could be something like (just an example, it could be different due to the current implementation):

foo: v.literal(false, 'required.foo', <invalid literal error message>)

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literal should not return the default message when the second argument is specified. In your case it should return 'required.foo'. But maybe I'm misunderstanding you. I'm sorry, I answer many questions every day and can't keep track of everything.

Feel free to provide me with a minimal reproduction, e.g. on StackBlitz. Then I can try to investigate your problem to understand it better.

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No problem, I can understand, I'll post here a MRE. Thank you.

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Here it is, if you try to submit without changing anything or if you choose one options other then 'PT' or 'ES'.

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