Transform an Archetype So All Properties are Not Required

archetype-20180105-transform-required.js

const Archetype = require('archetype');

// `UserType` has 3 required properties
const UserType = new Archetype({
  name: { $type: 'string', $required: true },
  email: { $type: 'string', $required: true },
  age: { $type: 'number', $required: true }
}).compile('UserType');

// But what if we want an `update()` function that updates a user?
// The `update()` function should take an argument that is an object
// that looks like `UserType`, but none of the properties are required
class User extends UserType {
  update(user) {
    // `UserUpdateType` is the modified `UserType` that you'll see below
    user = new UserUpdateType(user);
    return Object.assign(this, user);
  }
}

const UserUpdateType = UserType.
  transform((path, props) => {
    // Prints for each path in `UserType`:
    // name { '$type': 'string', '$required': true }
    // email { '$type': 'string', '$required': true }
    // age { '$type': 'number', '$required': true }
    console.log(path, props);
    delete props.$required;
    return props;
  }).
  compile('UserUpdateType');

const user = new User({ name: 'Val', email: 'test@test.com', age: '28' });
// Archetype will cast `age` to a number if it is present
user.update({ age: '29'});
console.log(user);