multiple-extends.js

import { ObjectModel } from "objectmodel";

const User = ObjectModel({
	email: String, // mandatory
	name: [String] // optional
});

const Person = ObjectModel({
	name: String,
	female: Boolean
});

const Order = ObjectModel({
	product: {
		name: String,
		quantity: Number
	},
	orderDate: Date
});

const Client = Person.extend(User, Order, { store: String });

Client.prototype.sendConfirmationMail = function() {
	return (
		this.email +
    ": Dear " +
    this.name +
    ", thank you for ordering " +
    this.product.quantity +
    " " +
    this.product.name +
    " on " +
    this.store
	);
};

console.log(Object.keys(Client.definition));
// ["name", "female", "email", "product", "orderDate", "store"]

const joe = new Client({
	name: "Joe",
	female: false,
	email: "joe@email.net",
	product: { name: "diapers", quantity: 100 },
	orderDate: new Date(),
	store: "daddy.net"
});

document.write(joe.sendConfirmationMail());
// joe@email.net: Dear Joe, thank you for ordering 100 diapers on daddy.net