transform does not work with fallback if union is also used...

[thecotne]

import * as v from 'valibot';

const BoolWithUnion = v.pipe(
  v.union([v.literal('true'), v.literal('false')]),
  v.transform((x) => x === 'true'),
)

const BoolWithFallbackUnion = v.fallback(BoolWithUnion, true);

const BoolWithCheck = v.pipe(
  v.string(),
  v.check(x => ['true', 'false'].includes(x)),
  v.transform((x) => x === 'true'),
)

const BoolWithFallbackCheck = v.fallback(BoolWithCheck, true);

const NumWithUnion = v.pipe(
  v.union([v.string(), v.number()]),
  v.transform((x) => typeof x === 'string' ? parseInt(x) : x),
)

const NumWithFallbackUnion = v.fallback(NumWithUnion, 42);

const NumWithCheck = v.pipe(
  v.any(),
  v.check(x => typeof x === 'string' || typeof x === 'number'),
  v.transform((x) => typeof x === 'string' ? parseInt(x) : x),
)

const NumWithFallbackCheck = v.fallback(NumWithCheck, 42);

console.log(v.parse(BoolWithUnion, 'false'));// false
console.log(v.parse(BoolWithCheck, 'false'));// false
console.log(v.parse(BoolWithFallbackUnion, 'false'));// "false" should be false
console.log(v.parse(BoolWithFallbackCheck, 'false'));// false
console.log(v.parse(NumWithUnion, '42'));// 42
console.log(v.parse(NumWithCheck, '42'));// 42
console.log(v.parse(NumWithFallbackUnion, '42'));// "42" should be 42
console.log(v.parse(NumWithFallbackCheck, '42'));// 42

[fabian-hiller]

Thank you! You found a bug! I will investigate this problem and check our unit tests.

[fabian-hiller]

v0.37.0 is available