Validate function return type

[campbed-adsk]

Is it possible to validate a functions return type using Valibot?
To be more specific, I am trying to replace my Zod implementation
z.function().returns(z.void().promise())
with something like
v.pipe(v.function(), v.returns(v.void().promise()))

Zod docs from original use: https://zod.dev/?id=functions
Valibot docs for functions: https://valibot.dev/api/function/

[fabian-hiller]

Have a look at #243 (comment).

import * as v from 'valibot';

// Simple but less readable version
const Schema1 = v.pipe(
  v.function(),
  v.transform((func) => () => v.parse(v.promise(), func()))
);

// Longer and more readable version
const Schema2 = v.pipe(
  v.function(),
  v.transform((func) => {
    return () => {
      const result = func();
      const parsed = v.parse(v.promise(), result);
      return parsed;
    };
  })
);

And if your function have unknown args:

import * as v from 'valibot';

// Simple but less readable version
const Schema1 = v.pipe(
  v.function(),
  v.transform(
    (func) =>
      (...args: unknown[]) =>
        v.parse(v.promise(), func(...args))
  )
);

// Longer and more readable version
const Schema2 = v.pipe(
  v.function(),
  v.transform((func) => {
    return (...args: unknown[]) => {
      const result = func(...args);
      const parsed = v.parse(v.promise(), result);
      return parsed;
    };
  })
);