Defining a Simple Schema for mongo's ObjectId

import * as D from "io-ts/Decoder"
import { ObjectId } from "mongodb"

export const string: D.Decoder<unknown, ObjectId> = {
  decode: (u) => {
    try {
      const objectId = new ObjectId(u)
      return D.success(u)
    } catch {
      return D.failure(u, "ObjectId")
    }
  }
}