decode.ts

import { pipe } from 'fp-ts/lib/pipeable';
import { fold } from 'fp-ts/lib/Either';
import codec from './codec.ts';

const input = {
  title: 'Title of this article',
  content: 'Content of this article',
  options: {
    private: true
  }
};

const result = pipe(
  codec.decode(input),
  fold(
    () => {
      throw new Error('Input validation error');
    },
    val => val
  )
);

/*
right = {
  title: string,
  content: string,
  options: {
    private?: boolean
  }
}
*/

const { right } = result;