create file object from url typescript

1fetch('//my-image-url')
2      .then((e) => {
3        return e.blob()
4      })
5      .then((blob) => {
6        let b: any = blob
7        b.lastModifiedDate = new Date()
8        b.name = ''
9        return b as File
10      })
11// Promise returning a File Object
12// (usefull for previewing image in updating forms)