React Example: Start Clerk Basic

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/// <reference types="vite/client" />
import {
  ClerkProvider,
  SignInButton,
  SignedIn,
  SignedOut,
  UserButton,
} from '@clerk/tanstack-react-start'
import { TanStackRouterDevtools } from '@tanstack/react-router-devtools'
import { createServerFn } from '@tanstack/react-start'
import { auth } from '@clerk/tanstack-react-start/server'
import * as React from 'react'
import {
  HeadContent,
  Link,
  Outlet,
  Scripts,
  createRootRoute,
} from '@tanstack/react-router'
import { DefaultCatchBoundary } from '~/components/DefaultCatchBoundary.js'
import { NotFound } from '~/components/NotFound.js'
import appCss from '~/styles/app.css?url'

const fetchClerkAuth = createServerFn({ method: 'GET' }).handler(async () => {
  const { userId } = await auth()

  return {
    userId,
  }
})

export const Route = createRootRoute({
  beforeLoad: async () => {
    const { userId } = await fetchClerkAuth()

    return {
      userId,
    }
  },
  head: () => ({
    meta: [
      {
        charSet: 'utf-8',
      },
      {
        name: 'viewport',
        content: 'width=device-width, initial-scale=1',
      },
    ],
    links: [
      { rel: 'stylesheet', href: appCss },
      {
        rel: 'apple-touch-icon',
        sizes: '180x180',
        href: '/apple-touch-icon.png',
      },
      {
        rel: 'icon',
        type: 'image/png',
        sizes: '32x32',
        href: '/favicon-32x32.png',
      },
      {
        rel: 'icon',
        type: 'image/png',
        sizes: '16x16',
        href: '/favicon-16x16.png',
      },
      { rel: 'manifest', href: '/site.webmanifest', color: '#fffff' },
      { rel: 'icon', href: '/favicon.ico' },
    ],
  }),
  errorComponent: (props) => {
    return (
      <RootDocument>
        <DefaultCatchBoundary {...props} />
      </RootDocument>
    )
  },
  notFoundComponent: () => <NotFound />,
  component: RootComponent,
})

function RootComponent() {
  return (
    <ClerkProvider>
      <RootDocument>
        <Outlet />
      </RootDocument>
    </ClerkProvider>
  )
}

function RootDocument({ children }: { children: React.ReactNode }) {
  return (
    <html>
      <head>
        <HeadContent />
      </head>
      <body>
        <div className="p-2 flex gap-2 text-lg">
          <Link
            to="/"
            activeProps={{
              className: 'font-bold',
            }}
            activeOptions={{ exact: true }}
          >
            Home
          </Link>{' '}
          <Link
            to="/posts"
            activeProps={{
              className: 'font-bold',
            }}
          >
            Posts
          </Link>
          <div className="ml-auto">
            <SignedIn>
              <UserButton />
            </SignedIn>
            <SignedOut>
              <SignInButton mode="modal" />
            </SignedOut>
          </div>
        </div>
        <hr />
        {children}
        <TanStackRouterDevtools position="bottom-right" />
        <Scripts />
      </body>
    </html>
  )
}