Recursively upload files and images to Sanity.io

const parallelLimit = require("async/parallelLimit");
const fs = require("fs");
const glob = require("glob");
const sanityClient = require("@sanity/client");

const client = sanityClient({
  projectId: 'get a project id', // TODO: projectId needed
  dataset: "production",
  token: 'get a write token', // TODO: token needed
  useCdn: false
});

var getDirectories = (src, callback) => {
  glob(src + "/**/*.*", callback);
};

getDirectories("files", (err, res) => {
  if (err) {
    console.log("Error", err);
  } else {
    const tasks = res.map((fileName, index) => cb => {
      client.assets
        .upload(getUploadType(fileName), fs.createReadStream("./" + fileName))
        .then(data => {
          console.log(index, 'of', res.length);
          cb(null, data);
        });
    });
    parallelLimit(tasks, 24, arrayOfResults => {
      console.log(arrayOfResults);
    });
  }
});
function getUploadType(fileName) {
  if (fileName.endsWith(".png") || fileName.endsWith(".jpg")) {
    return "image";
  }

  return "file";
}