@sanity-typed/preview-kit

@sanity/preview-kit with typed GROQ Results

Page Contents

• Install
• Usage
• Usage with groqd (actually groq-builder)
• Considerations
  • Types match config but not actual documents
  • GROQ Query results changes in seemingly breaking ways
  • Typescript Errors in IDEs
    • VSCode
  • Type instantiation is excessively deep and possibly infinite
• Breaking Changes
  • 2 to 3
    • Typescript version from 5.4.2 <= x <= 5.6.3
  • 1 to 2
    • No more createClient<SanityValues>()(config)

Install

npm install @sanity/preview-kit @sanity-typed/preview-kit

Usage

Use createClient exactly as you would from @sanity-typed/client.

product.ts:

// import { defineArrayMember, defineField, defineType } from "sanity";
import {
  defineArrayMember,
  defineField,
  defineType,
} from "@sanity-typed/types";

/** No changes using defineType, defineField, and defineArrayMember */
export const product = defineType({
  name: "product",
  type: "document",
  title: "Product",
  fields: [
    defineField({
      name: "productName",
      type: "string",
      title: "Product name",
      validation: (Rule) => Rule.required(),
    }),
    defineField({
      name: "tags",
      type: "array",
      title: "Tags for item",
      of: [
        defineArrayMember({
          type: "object",
          name: "tag",
          fields: [
            defineField({ type: "string", name: "label" }),
            defineField({ type: "string", name: "value" }),
          ],
        }),
      ],
    }),
  ],
});

sanity.config.ts:

import { structureTool } from "sanity/structure";

// import { defineConfig } from "sanity";
import { defineConfig } from "@sanity-typed/types";
import type { InferSchemaValues } from "@sanity-typed/types";

import { post } from "./schemas/post";
import { product } from "./schemas/product";

/** No changes using defineConfig */
const config = defineConfig({
  projectId: "59t1ed5o",
  dataset: "production",
  plugins: [structureTool()],
  schema: {
    types: [
      product,
      // ...
      post,
    ],
  },
});

export default config;

/** Typescript type of all types! */
export type SanityValues = InferSchemaValues<typeof config>;
/**
 *  SanityValues === {
 *    product: {
 *      _createdAt: string;
 *      _id: string;
 *      _rev: string;
 *      _type: "product";
 *      _updatedAt: string;
 *      productName: string;
 *      tags?: {
 *        _key: string;
 *        _type: "tag";
 *        label?: string;
 *        value?: string;
 *      }[];
 *    };
 *    // ... all your types!
 *  }
 */

preview-kit-client.ts:

import type { SanityValues } from "sanity.config";

// import { createClient } from "@sanity/preview-kit/client";
import { createClient } from "@sanity-typed/preview-kit";

// export const client = createClient({
export const client = createClient<SanityValues>({
  // ...base config options
  projectId: "59t1ed5o",
  dataset: "production",
  useCdn: true,
  apiVersion: "2023-05-23",

  // ...@sanity/preview-kit/client options
  studioUrl: "/studio",
  encodeSourceMap: "auto",
});

export const makeTypedQuery = async () =>
  client.fetch('*[_type=="product"]{_id,productName,tags}');
/**
 *  typeof makeTypedQuery === () => Promise<{
 *    _id: string;
 *    productName: string;
 *    tags: {
 *      _key: string;
 *      _type: "tag";
 *      label?: string;
 *      value?: string;
 *    }[] | null;
 *  }[]>
 */

Usage with groqd (actually groq-builder)

@scottrippey is working on an amazing typed groqd called groq-builder, a schema-aware, strongly-typed GROQ query builder with auto-completion and type-checking for your GROQ queries. When given a function, fetch will provide a GROQ builder for your use:

npm install groq-builder

client-with-groq-builder.ts:

import type { SanityValues } from "sanity.config";

import { createClient } from "@sanity-typed/client";

export const client = createClient<SanityValues>({
  projectId: "59t1ed5o",
  dataset: "production",
  useCdn: true,
  apiVersion: "2023-05-23",
});

export const makeTypedQuery = async () =>
  /** No need for createGroqBuilder, `q` is already typed! */
  client.fetch((q) =>
    q.star
      .filterByType("product")
      .project({ _id: true, productName: true, tags: true })
  );
/**
 *  typeof makeTypedQuery === () => Promise<{
 *    _id: string;
 *    productName: string;
 *    tags: {
 *      _key: string;
 *      _type: "tag";
 *      label?: string;
 *      value?: string;
 *    }[] | null;
 *  }[]>
 */

It will use the returned query and parse directly so you get typed results and runtime validation.

Deciding between using groq-builder or directly typed queries is your decision! There are pros or cons to consider:

• Typescript isn't optimized for parsing strings the way @sanity-typed/groq does, which can run into strange errors. Meanwhile, a builder is typescript-first, allowing for complex structures without any issues.
• Runtime validation is amazing! It was something I considered and abandoned so it's great to have a solution.
• The way @sanity-typed/groq had to be written, it can't do any auto-completion in IDEs like groq-builder can. There was no way around this. Typed objects and methods are going to be superior to parsing a string. Again, typescript wasn't made for it.
• There is something to be said for writing queries in their native syntax with less layers between. Writing GROQ queries directly lets you concern yourself only with their documentation, especially when issues arise.
• I'm not 100% certain that groq-builder handles all GROQ operations.
• groq-builder is currently in beta. You'll need to reference groqd's documentation and sometimes they don't match 1-to-1.

Considerations

Types match config but not actual documents

As your sanity driven application grows over time, your config is likely to change. Keep in mind that you can only derive types of your current config, while documents in your Sanity Content Lake will have shapes from older configs. This can be a problem when adding new fields or changing the type of old fields, as the types won't can clash with the old documents.

Ultimately, there's nothing that can automatically solve this; we can't derive types from a no longer existing config. This is a consideration with or without types: your application needs to handle all existing documents. Be sure to make changes in a backwards compatible manner (ie, make new fields optional, don't change the type of old fields, etc).

Another solution would be to keep old configs around, just to derive their types:

const config = defineConfig({
  schema: {
    types: [foo],
  },
  plugins: [myPlugin()],
});

const oldConfig = defineConfig({
  schema: {
    types: [oldFoo],
  },
  plugins: [myPlugin()],
});

type SanityValues =
  | InferSchemaValues<typeof config>
  | InferSchemaValues<typeof oldConfig>;

This can get unwieldy although, if you're diligent about data migrations of your old documents to your new types, you may be able to deprecate old configs and remove them from your codebase.

GROQ Query results changes in seemingly breaking ways

Similar to parsing, evaluating groq queries will attempt to match how sanity actually evaluates queries. Again, any fixes to match that or changes to groq evaluation will likely not be considered a major change but, rather, a bug fix.

Typescript Errors in IDEs

Often you'll run into an issue where you get typescript errors in your IDE but, when building workspace (either you studio or app using types), there are no errors. This only occurs because your IDE is using a different version of typescript than the one in your workspace. A few debugging steps:

VSCode

• The JavaScript and TypeScript Nightly extension (identifier ms-vscode.vscode-typescript-next) creates issues here by design. It will always attempt to use the newest version of typescript instead of your workspace's version. I ended up uninstalling it.
• Check that VSCode is actually using your workspace's version even if you've defined the workspace version in .vscode/settings.json. Use TypeScript: Select TypeScript Version to explictly pick the workspace version.
• Open any typescript file and you can see which version is being used in the status bar. Please check this (and provide a screenshot confirming this) before creating an issue. Spending hours debugging your issue ony to find that you're not using your workspace's version is very frustrating.

Type instantiation is excessively deep and possibly infinite

🚨 CHECK Typescript Errors in IDEs FIRST!!! ISSUES WILL GET CLOSED IMMEDIATELY!!! 🚨

You might run into the dreaded Type instantiation is excessively deep and possibly infinite error when writing GROQ queries. This isn't too uncommon with more complex GROQ queries. Unfortunately, this isn't a completely avoidable problem, as typescript has limits on complexity and parsing types from a string is an inherently complex problem. A set of steps for a workaround:

1. While not ideal, use @ts-expect-error to disable the error. You could use @ts-ignore instead, but ideally you'd like to remove the comment if a fix is released.
2. You still likely want manual types. Intersect the returned type with whatever is missing as a patch.
3. Create a PR in groq/src/specific-issues.test.ts with your issue. #642 is a great example for this. Try to reduce your query and config as much as possible. The goal is a minimal reproduction.
4. If a PR isn't possible, make an issue with the same content. ie, the query and config you're using. Again, reduce them as much as possible. And then, now that you've done all the work, move it into a PR instead!
5. I'm one person and some of these issues are quite complex. Take a stab at fixing the bug! There's a ridiculous amount of tests so it's relatively safe to try things out.

People will sometimes create a repo with their issue. Please open a PR with a minimal test instead. Without a PR there will be no tests reflecting your issue and it may appear again in a regression. Forking a github repo to make a PR is a more welcome way to contribute to an open source library.

Breaking Changes

2 to 3

Typescript version from 5.4.2 <= x <= 5.6.3

The supported Typescript version is now 5.4.2 <= x <= 5.6.3. Older versions are no longer supported and newer versions will be added as we validate it.

1 to 2

No more createClient<SanityValues>()(config)

Removing the double function signature from createClient:

- const client = createClient<SanityValues>()({
+ const client = createClient<SanityValues>({
  // ...
});

We no longer derive types from your config values. Most of the types weren't significant, but the main loss will be _originalId when the perspective was "previewDrafts".