TypeScript notes
To change type of a property in a new type first delete the property using Omit
and then add it again. Below example changes type of _id
from string
to ObjectId
:
type ReservationItem = {
_id: string;
label: string;
}
type ReservationItemDB = Omit<ReservationItem, '_id'> & {
_id: ObjectId;
timestamp: Date;
}
You can define type of documents read from a MongoDB collection like this:
const reservations = database.collection<ReservationItem>('reservations');