Convert firebase timestamps

Script that converts firebase timestamp values to the JS date format

• converts each timestamp within a document (object), also inside its maps and array
• converts single value
• possible to call in rxjs pipe

How to use

document

 return this.db.collection('my-collection').doc(id).snapshotChanges().pipe(
    map(doc => convertTimestamps(doc.payload.data())
)

single value

return this.db.collection('my-collection').doc(id).snapshotChanges().pipe(
    map(doc => {
		const data = doc.payload.data();
		data.date = convertTimestamp(data.date);
		return data;
	})
)

in pipe ! don't call it before map, the original document is too large to be convert and it will throw recursion exception

return this.db.collection('my-collection').doc(id)
  .snapshotChanges().pipe(
        map(doc => doc.payload.data()),
        convertTimestampsPipe(),
    );
)