types.js

import {sample, sampleOne} from 'babel-plugin-transform-flow-to-gen/api';

type Person = {
  name: string,
  age: number  
}

// creates a generator
const personGen = Person();

// creates a sample of that type
const person = sampleOne(personGen);

console.log(person);
// { "name": "egd3z", "age": 2 }

// creates 200 samples
const persons = sample(personGen, 200);

console.log(persons);
// [{ "name": "gf4E", "age": 0 }, { "name": "a", "age": 1 }, ... ]