@sanity/preview-kit

Sanity.io toolkit for building live-as-you-type content preview experiences. Write GROQ queries like @sanity/client and have them resolve in-memory, locally. Updates from Content Lake are streamed in real-time with sub-second latency.

Requires React 18, support for other libraries like Preact, Solid, Svelte, Vue etc is planned. For vanilla JS subscriptions you can use @sanity/groq-store directly.

Installation

npm i @sanity/preview-kit

yarn add @sanity/preview-kit

Usage

You create a usePreview hook using definePreview

import { definePreview } from '@sanity/preview-kit'

const usePreview = definePreview({ projectId, dataset })

If you want to declare the config in a separate file, and have full typings, you can import PreviewConfig:

import type { PreviewConfig } from '@sanity/preview-kit'
export const previewConfig: PreviewConfig = {
  projectId: process.env.NEXT_PUBLIC_SANITY_PROJECT_ID,
  dataset: process.env.NEXT_PUBLIC_SANITY_DATASET,
  // The limit on number of documents, to prevent using too much memory unexpectedly
  // It's 3000 by default, increase or decrease as needed and use `includeTypes` to further optimize the performance
  documentLimit: 10000,
  // Optional allow list filter for document types. You can use this to limit the amount of documents by declaring the types you want to sync. Note that since you're fetching a subset of your dataset, queries that works against your Content Lake might not work against the local groq-store.
  includeTypes: ['post', 'page', 'product', 'sanity.imageAsset'],
}

The component that calls usePreview needs to be wrapped in a Suspense boundary as it will "suspend" until the @sanity/groq-store is done loading your dataset and ready to resolve your queries. This component should also only be rendered in the browser and not on the server. If you use PreviewSuspense then both gotchas are covered for you:

import { definePreview, PreviewSuspense } from '@sanity/preview-kit'

const usePreview = definePreview({ projectId, dataset })

function PreviewComponent() {
  const data = usePreview(null, `*[]`)
}

export default function Page() {
  if (preview) {
    return (
      <PreviewSuspense fallback="Loading...">
        <PreviewComponent />
      </PreviewSuspense>
    )
  }
}

// pages/index.js
import { PreviewSuspense } from '@sanity/preview-kit'
import sanityClient from '@sanity/client'
import DataTable from 'components/DataTable'
import { lazy } from 'react'

const PreviewDataTable = lazy(() => import('components/PreviewDataTable'))

const projectId = process.env.NEXT_PUBLIC_SANITY_PROJECT_ID
const dataset = process.env.NEXT_PUBLIC_SANITY_DATASET
const apiVersion = process.env.NEXT_PUBLIC_SANITY_API_VERSION

export const getStaticProps = async ({ preview = false }) => {
  if (preview) {
    return { props: { preview } }
  }

  const client = sanityClient({
    projectId,
    dataset,
    apiVersion,
    useCdn: false,
  })
  const data = await client.fetch(`*[]`)

  return { props: { preview, data } }
}

export default function IndexPage({ preview, data }) {
  if (preview) {
    return (
      <PreviewSuspense fallback="Loading...">
        <PreviewDataTable />
      </PreviewSuspense>
    )
  }

  return <DataTable data={data} />
}

// components/PreviewDataTable.js
import { definePreview } from '@sanity/preview-kit'

const projectId = process.env.NEXT_PUBLIC_SANITY_PROJECT_ID
const dataset = process.env.NEXT_PUBLIC_SANITY_DATASET

const usePreview = definePreview({ projectId, dataset })

export default function PreviewDataTable() {
  const data = usePreview(null, `*[]`)

  return <DataTable data={data} />
}

Next 12 Preview Mode, with a viewer token

This example have the added benefit that it works in non-chromium browsers like Safari. And without needing a Sanity authenticated session to exist on the origin. This also means you need to protect your pages/api/preview handler with a secret, since the token can be used to query any data in your dataset. Only share preview links with people that you're ok with being able to see everything in your dataset.

// pages/index.js
import { PreviewSuspense } from '@sanity/preview-kit'
import sanityClient from '@sanity/client'
import DataTable from 'components/DataTable'
import { lazy } from 'react'

const PreviewDataTable = lazy(() => import('components/PreviewDataTable'))

const projectId = process.env.NEXT_PUBLIC_SANITY_PROJECT_ID
const dataset = process.env.NEXT_PUBLIC_SANITY_DATASET
const apiVersion = process.env.NEXT_PUBLIC_SANITY_API_VERSION

export const getStaticProps = async ({ preview = false, previewData = {} }) => {
  if (preview) {
    return { props: { preview, token: previewData.token } }
  }

  const client = sanityClient({
    projectId,
    dataset,
    apiVersion,
    useCdn: false,
  })
  const data = await client.fetch(`*[]`)

  return { props: { preview, data } }
}

export default function IndexPage({ preview, data, token }) {
  if (preview) {
    return (
      <PreviewSuspense fallback="Loading...">
        <PreviewDataTable token={token} />
      </PreviewSuspense>
    )
  }

  return <DataTable data={data} />
}

// components/PreviewDataTable.js
import { definePreview } from '@sanity/preview-kit'

const projectId = process.env.NEXT_PUBLIC_SANITY_PROJECT_ID
const dataset = process.env.NEXT_PUBLIC_SANITY_DATASET

const usePreview = definePreview({ projectId, dataset })

export default function PreviewDataTable({ token }) {
  const data = usePreview(token, `*[]`)

  return <DataTable data={data} />
}

// pages/api/preview.js
export default function preview(req, res) {
  const secret = process.env.PREVIEW_SECRET
  // Check the secret if it's provided, enables running preview mode locally before the env var is setup
  if (secret && req.query.secret !== secret) {
    return res.status(401).json({ message: 'Invalid secret' })
  }
  // This token should only have `viewer` access rights in https://manage.sanity.io
  const token = process.env.SANITY_API_READ_TOKEN
  if (!token) {
    throw new TypeError(`Missing SANITY_API_READ_TOKEN`)
  }

  res.setPreviewData({ token })
  res.writeHead(307, { Location: '/' })
  res.end()
}

Development

If you have access to the test studio and our Vercel Team, then:

npx vercel link && npx vercel env pull
npm run dev which gives you the test Next app running on http://localhost:3000.
Edit data in the test studio and watch it update live.

If you don't have access then you need to:

Create a new Sanity project and dataset, and enter their variables in .env.local (use .env.local.example to get started).
Open the Studio codesandbox and edit src/App.tsx to update projectId and dataset.
You can now run npm run dev and test things on http://localhost:3000.
As you edit things in the codesandbox studio you'll see them streamed to the next app.

Release new version

Run "CI & Release" workflow. Make sure to select the main branch and check "Release new version".

Semantic release will only release on configured branches, so it is safe to run release on any branch.

License

MIT-licensed. See LICENSE.