example.js

const t = require('tcomb');

const Employee = t.struct({
  first: t.String,
  last: t.String
}, 'Employee');

const employee = new Employee({
  first: 'Rodo',
  last: 'Abad'
});

console.log(employee); // eslint-disable-line no-console

const ExtendedEmployee = Employee.extend({
  selected: t.Bool
}, 'ExtendedEmployee');

const extendedExmployee = new ExtendedEmployee({
  first: 'Rodo',
  last: 'Abad',
  selected: true
});

console.log(extendedExmployee); // eslint-disable-line no-console

const originalEmployee = new Employee(extendedExmployee);

console.log(originalEmployee); // eslint-disable-line no-console