javascript - Cannot save "custom blob" to Firestore

Question

In javascript I am creating a blob from an array like so:

const a = new Blob([[1,2,3]]);

when I try to save this blob like:

this.afs.collection('events').doc(event.getID()).set({data: new Blob([[1,2,3]])}).then((some) => {
      debugger;
    })

I get an error:

DocumentReference.set() called with invalid data. Unsupported field value: a custom Blob object (found in field data)

What should I do to save a blob via JS to Firestore?

Answer 1

Waitting for answers