Conversion between js formats

blob.ts

const blob = b64toBlob(imageSrc.replace(/^data:image\/jpeg;base64,/, ""));
const file = new File([blob], "profile.jpeg", { type: "image/jpeg" });
const blobURl = URL.createObjectURL(file);

index.ts

function convertDataUrlToFile(dataURL: string, filename: string) {
  let arr = dataURL.split(","),
    mime = arr[0]?.match(/:(.*?);/)![1],
    bstr = atob(arr[arr.length - 1]!),
    n = bstr.length,
    u8arr = new Uint8Array(n);
  while (n--) {
    u8arr[n] = bstr.charCodeAt(n);
  }
  return new File([u8arr], filename, { type: mime });
}