download json or image for selected Figma design

indes.js

// run this function in dev console
function downloadBlob(blob, name = 'file.txt') {
  // Convert your blob into a Blob URL (a special url that points to an object in the browser's memory)
  const blobUrl = URL.createObjectURL(blob);

  // Create a link element
  const link = document.createElement("a");

  // Set link's href to point to the Blob URL
  link.href = blobUrl;
  link.download = name;

  // Append link to the body
  document.body.appendChild(link);

  // Dispatch click event on the link
  // This is necessary as link.click() does not work on the latest firefox
  link.dispatchEvent(
    new MouseEvent('click', { 
      bubbles: true, 
      cancelable: true, 
      view: window 
    })
  );

  // Remove link from body
  document.body.removeChild(link);
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// select node in figma and run code below in dev console in order to:
//
// 1. download json for selected node with children
(async () => {
  const selectedNode = figma.currentPage.selection[0]
  const json = await selectedNode.exportAsync({format: 'JSON_REST_V1'})
  // Return a JSON object in the same format as the Figma REST API response
  console.log(json.document)
  bytes = new TextEncoder().encode(JSON.stringify(json.document));
  blob = new Blob([bytes], {
    type: "application/json;charset=utf-8"
  });
setTimeout(() => downloadBlob(blob, `${selectedNode.id}-${selectedNode.name}.json`), 0)
})();


////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// 2. download image of swelected design
(async () => {
  const selectedNode = figma.currentPage.selection[0];
  const image = await selectedNode.exportAsync({
      format: 'JPG',
      constraint: { type: 'SCALE', value: 0.5 },
    });
  let imageBlob = new Blob([image.buffer], {type: "image/jpg"})
  setTimeout(() => downloadBlob(imageBlob, `${selectedNode.id}-${selectedNode.name}.jpg`), 0)
})()