harsh-harlequin

Type errors when adding a validator zod schema and initializing the default value to null.

I have a schema where the field month is validated to be non null.

const schema = z.object({ month: z.coerce.date()})

const schema = z.object({ month: z.coerce.date()})

on the form end

  const form = useAppForm({
    defaultValues: {
        month: null
    },
    validators: {
      onSubmit: schema, //type error at the onSubmit because month is 'null'
    },
})

  const form = useAppForm({
    defaultValues: {
        month: null
    },
    validators: {
      onSubmit: schema, //type error at the onSubmit because month is 'null'
    },
})

I don't want to initialize with a date, since its a MonthPickerInput component. What are the options?

MonthPickerInput | Mantine

Month, multiple months and months range picker input

7 Replies

rival-black•7mo ago

defaultValues: {
  month: null
} as z.infer<typeof schema>

defaultValues: {
  month: null
} as z.infer<typeof schema>

harsh-harlequinOP•7mo ago

thanks @ksgn 🤦🏼‍♂️ can't believe solution is that simple update, have to use Partial<inferred>, but it works perfectly Follow up question Technically, since I passed the schema to the onSubmit validator, shouldn't value in onSubmit be the inferred type of the Schema and not the default values so i don't have to cast it there?

 defaultValues: {
//omitted
 } as Partial<NewInitiative>,
    validators: {
      onSubmit: NewInitiativeSchema,
    },
    onSubmit: async ({ value }) => {
      await mutateAsync(value as NewInitiative);

 defaultValues: {
//omitted
 } as Partial<NewInitiative>,
    validators: {
      onSubmit: NewInitiativeSchema,
    },
    onSubmit: async ({ value }) => {
      await mutateAsync(value as NewInitiative);

continuing-cyan•7mo ago

value is inferred from defaultValues. Why do you pass Partial, do you need them to be typed as Date | undefined? if not, you can just cast the empty object as NewInitiative in defaultValues

harsh-harlequinOP•7mo ago

i want month to initialize to null, i don't want the monthpicker to have a preselected value on the form, hence defaultValue for month should be null/undefined On the schema end, i don't want it to be nullable or typed as Date | undefined, i want it to show errors on the form if the user forgets to fill up that field you're right i don't need the Partial when casting the default values, it was my LSP server lagging

wise-white•7mo ago

What you're looking for is this: https://discord.com/channels/719702312431386674/1100437019857014895/1347536458470264923 But it's a limitation of Zod, bit Form that it doesn't exist ootb

harsh-harlequinOP•7mo ago

yeah, just saw that thread. seems to be a common problem? I still think that onSubmit values should be typed to the validators output if it exists

wise-white•7mo ago

That's the goal eventually; the typing (and runtime code) to support that is non-trivial

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Type errors when adding a validator zod schema and initializing the default value to null.

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