Download plaintext as a file

downloadTextAsFile.ts

async function downloadTextAsFile(text: string, filename: string): Promise<void> {
  if (!filename.endsWith(".txt")) {
    filename = `${filename}.txt`;
  }
  const blob = new Blob([text], { type: "text/plain" });
  const href = await URL.createObjectURL(blob);
  const link = document.createElement("a");
  link.href = href;
  link.download = filename;
  link.style.position = "absolute";
  link.style.left = "200vw";
  document.body.appendChild(link);
  link.click();
  document.body.removeChild(link);
}