When parsing an Object, keys with undefined value should only be returned if they are provided in input

[xinha-sh]

Discussed in #196

^{Originally posted by xinha-sh October 4, 2023}

import * as v from "valibot";

const baseSchema = v.object({
  x: v.optional(v.array(v.string())),
  y: v.optional(v.array(v.string())),
 z: v.optional(v.array(v.string())),
})

const schemaA = v.object({
  key1: v.optional(baseSchema), 
  key2: v.optional(baseSchema)
})

const input = {key1:  {x: ["hello", "world"]}}
const result = v.parse(schemaA, input)

// result.output
// {key1: {x:  ["hello", "world"]}, key2: undefined}

Why do I get key2: undefined in the output ? What's the best way to ignore them.

My use case is that upon successful parsing I want to loop over array values via Object.values(catalog).map(item => objectKeys(item)).flat() which breaks with error Cannot convert undefined or null to object

This used to work as intended with zod schema.
Unless my input is const input = {key1: {x: ["hello", "world"]}, key2: undefined} the output shouldn't contain undefined.

What's valibot's way of stripping away undefined keys ?

[fabian-hiller]

Thank you! I will investigate this.

[fabian-hiller]

Fixed in v0.19.0