basicModel.ts

import { Document, Schema, Model, model, Types } from "mongoose"

// We are definining typescript basic typescript interface first, properties only
export interface IHouse {
  id?: any
  name: string
  rooms: Types.DocumentArray<IRoomDocument>
  owners: Types.DocumentArray<IOwnerDocument>

}

// We are definiting document which will have all mongoose document methods mixed in, plus our customer Document methods
export interface IHouseDocument extends IHouse, Document {
  currentValue(): Promise<string[]>
}

// here we are defining interface for model, and our example find function
export interface IHouseModel extends Model<IHouseDocument> {
  findInCity(
    city: string,
    street: string,
    zipCode: string
  ): IHouseDocument
}

// we do our standard mongoose schema definition here
export const houseSchema: Schema = new Schema({
  name: String,
})

// defining function which we described in IHouseDocument
houseSchema.methods.currentValue = async function(): Promise<string[]> {
  // do something ...
}

// defining function which we described in IHouseModel
houseSchema.statics.findInCity = async (
  city: string,
    street: string,
    zipCode: string
) => {
  // do something ...
}

export const House = model<IHouseDocument, IHouseModel>("House", houseSchema)