userschema-subdocument.ts

import { Document, Schema } from "mongoose"

// Subdocument schema
const UserAddressSchema = Schema(
  {
    street: String,
    zipcode: {
      type: String,
      required: true,
    }
  }, 
  { _id: false }
)

// Top-level schema with subdocument embedded
const UserSchema = Schema({
  ...
  address: UserAddressSchema,
  ...
})

/** Types **/
// Interface for subdocument
// Notice how this interface doesn't inherent from Document
export interface UserAddress {
  street?: string;
  zipcode: string;
}

// Interface for document 
interface User {
  ...
  address: UserAddress;
  ...
}

export interface UserBaseDocument extends User, Document {}