Reduce boilerplate for custom actions about valibot HOT 4 CLOSED

I added ContentInput, ContentRequirement, LengthInput, SizeInput and ValueInput to the exports.

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Thanks for the feedback. I will check if I want to export these types, but in general it is probably a good idea. nonEmpty is now natively supported out of the box, so you don't have to add it yourself.

In general, there is no difference from before. The only difference is that the API has become more type-safe, which requires more precious typing, resulting in more TypeScript code. But if you don't care, you can write it much the same way as before. Here is an example. You can test it in this playground.

import * as v from 'valibot';

type LengthInput = string | unknown[];

function nonEmpty<TInput extends LengthInput>(
  message: string = 'Non-empty value required.'
): v.MinLengthAction<TInput, 1, string> {
  return v.minLength(1, message);
}

If you prefer precise types, I have rewritten your code to make it a bit simpler. You can test it in this playground.

import * as v from 'valibot';

type LengthInput = string | unknown[];

function nonEmpty<
  TInput extends LengthInput,
  const TMessage extends v.ErrorMessage<v.MinLengthIssue<TInput, 1>>,
>(
  message: TMessage = 'Non-empty value required.' as TMessage
): v.MinLengthAction<TInput, 1, TMessage> {
  return v.minLength(1, message);
}

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Another use case is:

export function integerNumber<TMessage extends v.ErrorMessage<v.NumberIssue>>(message?: TMessage) {
  return v.pipe(v.number(message), v.integer())
}

is there a better way to type this? Most of the schemas use function overload to distinguish between the message and undefined:

declare function number(): NumberSchema<undefined>;
declare function number<const TMessage extends ErrorMessage<NumberIssue> | undefined>(message: TMessage): NumberSchema<TMessage>;

Is there a way to proxy this contract somehow to the extending one-liners?

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As I understand it, this is not possible without drawbacks. That's why I use overload signatures.

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