donwload.js

const untar = await require("js-untar");

async download(file: PersssistFile) {
  const iterable = this.ipfs.get(file.filePath);
  var chunks: Uint8Array[] = [];
  
  // we need to use a for await for downloading 
  // the buffer in chunks.
  for await (const b of iterable) {
      chunks.push(b);
  }
  
  // the result is a tar file, so we need to find a way to
  // untar the file from the fronted, in my case I did it with untar lib.
  const tarball = new Blob(chunks, { type: 'application/x-tar' })
  const tarAsArrayBuffer = await tarball.arrayBuffer();
  const result = await this.untar(tarAsArrayBuffer);
  
  // finally we create the blob and download it.
  const resultFile = new Blob([result[0].buffer], { type: file.fileType })
  var url = window.URL.createObjectURL(resultFile);
  this.downloadURL(url, file.fileName);
}