sanity-deno-client.ts

type SanityClientOptions = {
  projectId: string;
  dataset: string;
  token?: string;
  useCdn?: boolean;
};

type QueryParameters = Record<string, string | number>;

const sanityClient = (options: SanityClientOptions) => {
  const { useCdn, projectId, dataset, token } = options;
  const hasToken = token && token.length > 0;
  const baseHost = useCdn && !hasToken ? "apicdn.sanity.io" : "api.sanity.io";
  const endpoint = `https://${projectId}.${baseHost}/v1/data/query/${dataset}`;

  // Parse JSON and throw on bad responses
  const responseHandler = (response: Response) => {
    if (response.status >= 400) {
      throw new Error([response.status, response.statusText].join(" "));
    }
    return response.json();
  };

  // We need to prefix groq query params with `$` and quote the strings
  const transformedParams = (parameters: QueryParameters) =>
    Object.keys(parameters).reduce<QueryParameters>((prev, key) => {
      prev[`$${key}`] = JSON.stringify(parameters[key]);
      return prev;
    }, {});

  return {
    fetch: async (query: string, parameters?: QueryParameters) => {
      const urlParams = new URLSearchParams({
        query,
        ...(parameters && transformedParams(parameters)),
      });

      const url = new URL([endpoint, urlParams].join("?"));
      const request = new Request(url.toString());

      if (hasToken) {
        request.headers.set("Authorization", `Bearer ${token}`);
      }

      return (
        fetch(request)
          .then(responseHandler)
          // The query results are in the `result` property
          .then((json) => json.result)
      );
    },
  };
};

async function runExample() {
  const client = sanityClient({
    projectId: "rwmuledy",
    dataset: "master",
    token: "",
    useCdn: true,
  });

  const query = `
  * [_type == $type] {
    _id,
    title,
    "cool": true
  }[0...$limit]
  `;

  await client.fetch(query, { type: "post", limit: 2 }).then(console.log);
}

runExample();

Download this file and run it locally

deno run --allow-net sanity-deno-client.ts