Required dependencies

npm install get-it rxjs nanoid @sanity/eventsource

No native modules, no pod install, no prebuild steps required. For Edge Runtime or Deno, use the index.browser.ts entry (or the published CDN URL) rather than index.ts which pulls in Node-specific middleware.

Project setup

1. Copy the source/ directory into your project, e.g. src/sanity-client/.

2. Update tsconfig.json to include the source and enable the required compiler options:

{
  "compilerOptions": {
    "target": "ES2020",
    "module": "NodeNext",
    "moduleResolution": "NodeNext",
    "strict": true,
    "paths": {
      "@sanity/client": ["./src/sanity-client/index.ts"],
      "@sanity/client/csm": ["./src/sanity-client/csm/index.ts"],
      "@sanity/client/stega": ["./src/sanity-client/stega/index.ts"]
    }
  }
}

3. Set environment variables (do not derive dynamically at runtime):

SANITY_PROJECT_ID=your-project-id
SANITY_DATASET=production
SANITY_API_TOKEN=sk...

4. Create a shared client instance:

// src/lib/sanity.ts
import {createClient} from './sanity-client/index.ts'

export const client = createClient({
  projectId: process.env.SANITY_PROJECT_ID!,
  dataset: process.env.SANITY_DATASET!,
  apiVersion: '2025-02-06', // hard-code; never use new Date()
  useCdn: true,
  token: process.env.SANITY_API_TOKEN,
})

Public API

createClient

import {createClient} from './sanity-client/index.ts'

const client = createClient(config: ClientConfig): SanityClient

Primary factory function. Accepts a ClientConfig object and returns a fully initialized SanityClient. Use this as the single entry point for all Sanity API interactions.

SanityClient

import {SanityClient} from './sanity-client/index.ts'

class SanityClient {
  fetch<R>(query: string, params?: QueryParams, options?: QueryOptions): Promise<R>
  create<R extends SanityDocumentStub>(doc: R, options?: BaseMutationOptions): Promise<SanityDocument<R>>
  patch(documentId: PatchSelection): Patch
  delete(selection: MutationSelection, options?: BaseMutationOptions): Promise<SingleMutationResult>
  transaction(): Transaction
  listen<R>(query: string, params?: QueryParams): Observable<MutationEvent<R>>
  config(newConfig?: Partial<ClientConfig>): InitializedClientConfig | this
  withConfig(newConfig: Partial<ClientConfig>): SanityClient
  datasets: DatasetsClient
  projects: ProjectsClient
  assets: AssetsClient
  users: UsersClient
  releases: ReleasesClient
  agent: AgentActionsClient
}

The main client class. Use fetch for GROQ queries, patch/create/delete for mutations, listen for real-time updates, and withConfig to derive a scoped client with different settings.

requester

import {requester} from './sanity-client/index.ts'

const requester: Requester

The underlying get-it requester instance used by the client. Use this when you need to make raw HTTP requests to Sanity APIs without the full client abstraction, or when wiring custom middleware.

stegaClean

import {stegaClean} from './sanity-client/stega/index.ts'

function stegaClean<T>(result: T): T

Strips steganography-encoded data from query results. Use before rendering user-visible content or sending data to third-party services that must not receive encoded payloads.

Working examples

Scenario - Fetch published documents with GROQ

Query all published posts and decode the result type. This is the baseline pattern for read-only data fetching.

import {createClient} from './sanity-client/index.ts'

const client = createClient({
  projectId: 'abc123',
  dataset: 'production',
  apiVersion: '2025-02-06',
  useCdn: true,
  perspective: 'published',
})

interface Post {
  _id: string
  _type: 'post'
  title: string
  slug: {current: string}
}

async function getPosts(): Promise<Post[]> {
  return client.fetch<Post[]>('*[_type == "post"]{_id, _type, title, slug}')
}

const posts = await getPosts()
console.log(posts)

Scenario - Create and patch a document in a transaction

Atomically create a document and immediately update a related record inside a single transaction.

import {createClient} from './sanity-client/index.ts'

const client = createClient({
  projectId: 'abc123',
  dataset: 'production',
  apiVersion: '2025-02-06',
  useCdn: false,
  token: process.env.SANITY_API_TOKEN,
})

async function publishArticle(draft: {_type: string; title: string; body: string}) {
  const result = await client
    .transaction()
    .create({_type: draft._type, title: draft.title, body: draft.body})
    .patch('site-settings', (p) => p.setIfMissing({lastPublished: null}).set({lastPublished: new Date().toISOString()}))
    .commit()

  return result
}

Scenario - Real-time listening with Observable

Subscribe to live mutations on a document type. Use RxJS operators since listen returns an Observable.

import {createClient} from './sanity-client/index.ts'
import {filter, map} from 'rxjs/operators'

const client = createClient({
  projectId: 'abc123',
  dataset: 'production',
  apiVersion: '2025-02-06',
  useCdn: false,
  token: process.env.SANITY_API_TOKEN,
})

const subscription = client
  .listen('*[_type == "comment"]', {}, {includeResult: true})
  .pipe(
    filter((event) => event.type === 'mutation'),
    map((event) => event.result),
  )
  .subscribe((comment) => {
    console.log('New/updated comment:', comment)
  })

// Clean up when done
// subscription.unsubscribe()

Scenario - Stega encode and clean for Visual Editing

Fetch with Content Source Maps enabled, pass encoded data to the Visual Editing layer, and clean before external use.

import {createClient} from './sanity-client/index.ts'
import {stegaClean} from './sanity-client/stega/index.ts'

const client = createClient({
  projectId: 'abc123',
  dataset: 'production',
  apiVersion: '2025-02-06',
  useCdn: true,
  stega: {enabled: true, studioUrl: 'https://your-studio.sanity.studio'},
})

const data = await client.fetch('*[_type == "page"][0]{title, body}')

// Pass `data` to your visual editing overlay as-is.
// Before sending to analytics or external APIs, strip encoding:
const cleanData = stegaClean(data)
console.log(cleanData)

File walkthrough

• index.ts — Node.js public entry; calls defineCreateClientExports with Node middleware, exports createClient, requester, and all types.
• index.browser.ts — Browser public entry; same shape as index.ts but uses browserMiddleware.
• SanityClient.ts — Implements SanityClient and ObservableSanityClient with all query, mutation, and sub-client methods.
• config.ts — initConfig validates and merges ClientConfig into InitializedClientConfig; defaultConfig holds baseline values.
• defineCreateClient.ts — Exports the createClient factory and ClientConfig type; parameterized over client class and config.
• defineDeprecatedCreateClient.ts — Wraps createClient for the legacy default export pattern.
• types.ts — Canonical location for all public TypeScript types: ClientConfig, SanityDocument, QueryOptions, ClientPerspective, etc.
• validators.ts — Runtime checks on project IDs, dataset names, and config fields.
• warnings.ts — Centralized console.warn wrappers for deprecation notices.
• generateHelpUrl.ts — Builds https://www.sanity.io/help/... URLs embedded in thrown errors.
• media-library.ts — Dedicated entry point re-exporting the media library client.
• agent/ — AgentActionsClient and per-action files (generate, patch, prompt, transform, translate) for Sanity Agent Actions API.
• assets/ — AssetsClient handling file and image uploads.
• csm/ — Content Source Maps: applySourceDocuments, resolveEditInfo, resolveEditUrl, draftUtils, jsonPath, studioPath, walkMap.
• data/ — Core data layer: dataMethods (fetch, getDocument), listen, live, patch, transaction, eventsource, encodeQueryString.
• datasets/ — DatasetsClient with CRUD for datasets.
• http/ — browserMiddleware, nodeMiddleware, errors, request, requestOptions — the HTTP abstraction layer.
• mediaLibrary/ — MediaLibraryVideoClient for media library video operations.
• projects/ — ProjectsClient for project-level API operations.
• releases/ — ReleasesClient and createRelease helper for content releases.
• stega/ — Steganography encoding (stegaEncodeSourceMap, encodeIntoResult), cleaning (stegaClean, vercelStegaCleanAll), and stega-aware client exports.
• users/ — UsersClient for fetching user information.
• util/ — Internal helpers: codeFrame, createVersionId, defaults, getSelection, isRecord, once, pick.

Common pitfalls and fixes

• Hard-coding apiVersion: Never use new Date() for apiVersion; it will break your app when the date advances past an API boundary. Pin a fixed string like '2025-02-06'.
• Wrong entry for Edge/browser: Importing from index.ts in an Edge Runtime pulls in nodeMiddleware which references Node.js built-ins. Use index.browser.ts or alias the package to the browser entry in your bundler config.
• perspective default changed: As of v2025-02-19, the default perspective is published not raw. Queries that previously returned draft documents may silently return fewer results — set perspective: 'raw' explicitly if you need the old behaviour.
• Missing token for mutations: create, patch, delete, and listening to private datasets all require a token with write/read permissions. Requests silently return 401 if omitted.
• rxjs version mismatch: The source imports from rxjs directly. Ensure your project has rxjs@^7 installed; mixing v6 and v7 in a monorepo will cause runtime errors.
• tsconfig moduleResolution: This source uses modern ESM imports with explicit .ts extensions. Set moduleResolution to NodeNext or Bundler; Node (classic) resolution will fail to resolve sub-path imports like @sanity/client/csm.

Vibe-coding prompt template

I have vendored the source of @sanity/client@7.21.0 into `src/sanity-client/`.
There is a USAGE.md file at the root of this block that documents all public
exports, working code examples, setup steps, and common pitfalls.

Please read USAGE.md and the files under `src/sanity-client/` and then:

1. Install the required dependencies listed in USAGE.md (get-it, rxjs, nanoid,
   @sanity/eventsource) into my project.
2. Create a shared client instance at `src/lib/sanity.ts` using `createClient`
   from `src/sanity-client/index.ts`, reading credentials from environment
   variables SANITY_PROJECT_ID, SANITY_DATASET, and SANITY_API_TOKEN.
3. Update `tsconfig.json` so that imports of `@sanity/client` and
   `@sanity/client/csm` resolve to the vendored source via path aliases.
4. Integrate the client into my existing project by:
   [DESCRIBE YOUR USE CASE HERE — e.g. "adding a /api/posts route in my
   Express app that fetches all published posts" or "replacing my current
   fetch calls with typed GROQ queries"]
5. Add a real-time listener using `client.listen()` for [DESCRIBE DOCUMENT
   TYPE] and wire it to [DESCRIBE YOUR STATE/HANDLER].
6. Show me how to clean stega-encoded results with `stegaClean` before I
   pass data to [DESCRIBE EXTERNAL SERVICE].

Follow the patterns in USAGE.md exactly. Do not invent any API methods not
documented there.

License and credit

The upstream project is licensed under the MIT License — see source/LICENSE if present, or refer to the npm package page. This block is derived from @sanity/client@7.21.0 published by Sanity.io.

This product’s unique contribution is clean room implementation of valuable code block into AVCP compatible standard.

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