router fix: allow json literals in serializer

Closes #3157

This PR allows literal values to be passed without transformation in types. As a side effect it allows to pass branded types. See example:

import { createFileRoute } from '@tanstack/react-router'
import { createServerFn } from '@tanstack/react-start'
import { z } from 'zod'

const UserIdSchema = z
  .string()
  .brand('UserId') // this didn't work in the past, now works

const UserSchema = z
  .object({
    id: UserIdSchema,
    name: z.string(),
  })
  .brand('User') // this worked in the past

const getUserInfo = createServerFn({ method: 'GET' })
  .validator(z.number())
  .handler(() => {
    return UserSchema.parse({
      id: '123',
      name: 'asdf',
    })
  })

export const Route = createFileRoute('/')({
  component: Home,
  loader: async () => await getUserInfo({ data: 5 }),
})

function Home() {
  const state = Route.useLoaderData()

  const renderUser = (user: z.infer<typeof UserSchema>) => {
    return (
      <div>
        <h1>{user.name}</h1>
        <p>{user.id}</p>
      </div>
    )
  }

  return renderUser(state)
}

Mar 25 '25 00:03 xPapla

View your CI Pipeline Execution ↗ for commit 0bfee8ba64e9d49ced189ba5a74a4b2da57de7b6.

Command	Status	Duration	Result
`nx affected --targets=test:eslint,test:unit,tes...`	✅ Succeeded	4m 53s	View ↗
`nx run-many --target=build --exclude=examples/*...`	✅ Succeeded	2m 3s	View ↗

☁️ Nx Cloud last updated this comment at 2025-03-25 00:10:51 UTC

Mar 25 '25 00:03 nx-cloud[bot]

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commit: 0bfee8b

Mar 25 '25 00:03 pkg-pr-new[bot]

we'll migrate to seroval soon, let's revisit this PR then

Mar 26 '25 11:03 schiller-manuel

Hoping this still goes through, but noting that post sevoral, this has moved to start-client-core package.

Jul 18 '25 03:07 jvliwanag

@xPapla @jvliwanag , the linked ticket appear to have been closed already - it this PR still relevant?

Nov 19 '25 20:11 birkskyum