Overview

import { Point0 } from '@point0/core'

export const root = Point0.lets
  .root()
  // shown while a point's data is loading
  .loading(() => <Spinner />)
  // shown if loading failed
  .error(({ error }) => <ErrorScreen error={error} />)
  // loaders may return React elements (RSC: server components & islands)
  .rsc({ depth: 1 })
  .root() // a point ends with the word it started with (.root) — same for all points

import { root } from '@/lib/root'
import { prisma } from '@/lib/prisma' // server-only — never reaches the client

export const ideaPage = root.lets
  .page('/ideas/:id') // params.id is typed because the route has :id
  .loader(async ({ params }) => {
    const idea = await prisma.idea.findUniqueOrThrow({
      where: { id: params.id },
    })
    return { idea } // whatever the loader returns is typed below
  })
  .head(({ data: { idea } }) => idea.title) // the page's <title>
  .page(({ data: { idea } }) => (
    // in .page() the data is already loaded — otherwise we never reach here,
    // the root's .loading() or .error() shows instead
    <article>
      <h1>{idea.title}</h1>
      <p>{idea.content}</p>
    </article>
  ))

import { root } from '@/lib/root'
import { prisma } from '@/lib/prisma'
import * as z from 'zod'

export const ideaViewQuery = root.lets
  .query()
  .input(z.object({ id: z.string() })) // schema via any library: zod, valibot, typebox…
  .loader(async ({ input }) => {
    const idea = await prisma.idea.findUniqueOrThrow({
      where: { id: input.id },
    })
    return { idea }
  })
  .query()

export const ideaPage = root.lets
  .page('/ideas/:id')
  // inject the query and map route params onto its input
  .with(ideaViewQuery, ({ params }) => ({ id: params.id }))
  .head(({ data: { idea } }) => idea.title)
  .page(({ data: { idea } }) => (
    <article>
      <h1>{idea.title}</h1>
      <p>{idea.content}</p>
    </article>
  ))

export const ideaPage = root.lets
  .page('/ideas/:id')
  .with(ideaViewQuery, ({ params }) => ({ id: params.id }))
  .with(ideaBestQuery) // a second query; both load in parallel
  .mapper(({ queries: [view, best] }) => ({
    idea: view.data.idea,
    bestIdea: best.data.bestIdea,
  }))
  .page(({ data: { idea, bestIdea } }) => (
    <article>
      <h1>{idea.title}</h1>
      <aside>Best idea: {bestIdea.title}</aside>
    </article>
  ))

import { root } from '@/lib/root'
import { prisma } from '@/lib/prisma'
import { navigate } from '@/lib/navigation'
import * as z from 'zod'

export const ideaUpdateMutation = root.lets
  .mutation()
  .input(
    z.object({
      id: z.string(),
      title: z.string().min(1),
      content: z.string().min(1),
      image: z.file().optional(), // a file field, like any other input
    }),
  )
  .loader(async ({ input }) => {
    // input.image is a real File on the server — or undefined if none sent
    const cover = input.image && Buffer.from(await input.image.arrayBuffer())
    const idea = await prisma.idea.update({
      where: { id: input.id },
      data: { title: input.title, content: input.content, cover },
    })
    return { idea }
  })
  .mutation()

export const ideaEditPage = root.lets
  .page('/ideas/:id/edit')
  .with(ideaViewQuery, ({ params }) => ({ id: params.id }))
  .page(({ data: { idea } }) => {
    const mutation = ideaUpdateMutation.useMutation()
    return (
      <form
        onSubmit={async (e) => {
          e.preventDefault()
          const form = new FormData(e.currentTarget)
          const image = form.get('image') as File
          await mutation.mutateAsync({
            id: idea.id,
            title: String(form.get('title')),
            content: String(form.get('content')),
            // any File in the data → multipart; none → plain JSON.
            // the schema only validates; it doesn't pick the encoding.
            image: image.size > 0 ? image : undefined,
          })
          await navigate('ideaView', { id: idea.id })
        }}
      >
        <input name="title" defaultValue={idea.title} />
        <textarea name="content" defaultValue={idea.content} />
        <input type="file" name="image" />
        <button disabled={mutation.isPending}>Save</button>
      </form>
    )
  })

import { root } from '@/lib/root'
import { prisma } from '@/lib/prisma'

export const IdeaBestComponent = root.lets
  .component<{ cta: string }>() // the component's input props type
  .loader(async () => {
    // server-only, like every loader — this body is stripped from the client
    const bestIdea = await prisma.idea.findFirstOrThrow({
      orderBy: { rating: 'desc' },
    })
    return { bestIdea }
  })
  .component(({ data, props }) => (
    <div>
      <h2>Best idea: {data.bestIdea.title}</h2>
      <p>{props.cta}</p>
    </div>
  ))

// use it like any component — short notation (name starts with a capital letter)
export const homePage = root.lets.page('/').page(() => (
  <main>
    <h1>Home</h1>
    <IdeaBestComponent cta="It's on fire!" />
  </main>
))

import { root } from '@/lib/root'
import { prisma } from '@/lib/prisma'

// close the loader with .query({ suspend: true }) so it never blocks the page
export const IdeaStats = root.lets
  .component()
  .loader(async () => ({ count: await prisma.idea.count() }))
  .query({ suspend: true })
  .component(({ data }) => <p>{data.count} ideas so far</p>)

export const IdeaTrending = root.lets
  .component()
  .loader(async () => ({ ideas: await prisma.idea.findMany({ take: 5 }) }))
  .query({ suspend: true })
  .component(({ data }) => <IdeaList items={data.ideas} />)

// the shell ships instantly; each component streams in — with the root's
// loading state in its place — as its own loader resolves, in one response
export const dashboardPage = root.lets.page('/dashboard').page(() => (
  <main>
    <h1>Dashboard</h1>
    <IdeaStats />
    <IdeaTrending />
  </main>
))

import { root } from '@/lib/root'
import { prisma } from '@/lib/prisma'

// a plain async function — its code and this prisma call stay on the server
const IdeasStats = async () => {
  const count = await prisma.idea.count()
  return <p>{count} ideas so far</p>
}

export const feedPage = root.lets
  .page('/feed')
  .loader(async () => ({
    // a server component — renders here, only its markup ships
    stats: <IdeasStats />,
    // a component point — travels as a reference, hydrates as a live island
    best: <IdeaBestComponent cta="It's on fire!" />,
  }))
  .page(({ data }) => (
    <main>
      {data.stats}
      {data.best}
    </main>
  ))

import { defer } from '@point0/core'
import { root } from '@/lib/root'
import { prisma } from '@/lib/prisma'

// a slow server component — its query and imports stay on the server
const Comments = async ({ ideaId }: { ideaId: string }) => {
  const comments = await prisma.comment.findMany({ where: { ideaId } })
  return <CommentList comments={comments} />
}

export const ideaPage = root.lets
  .page('/ideas/:id')
  .loader(async ({ params }) => {
    const idea = await prisma.idea.findUniqueOrThrow({
      where: { id: params.id },
    })
    return {
      idea, // fast — ships in the first paint
      // slow — the page ships without it, then it streams into the same response
      comments: defer(<Comments ideaId={params.id} />, <Spinner />),
    }
  })
  .page(({ data }) => (
    <article>
      <h1>{data.idea.title}</h1>
      {data.comments}
    </article>
  ))