Custom Types with Archetype

archetype-20171028-custom-types.js

const Archetype = require('archetype');
// `Str` is a utility type for strings unrelated
// to archetype: https://www.npmjs.com/package/string
// It provides several convenient string utilities,
// including `.capitalize()`.
const Str = require('string');

const NameType = new Archetype({
  // Archetype custom types are trivial: any function,
  // including any class, is a viable `$type`.
  first: { $type: Str },
  last: { $type: Str }
}).compile('NameType');

const { first, last } = new NameType({ first: 'hello', last: 'world' });

// "Hello World"
console.log(first.capitalize().toString(), last.capitalize().toString());